Vivanza

Emer M. Smyth PhD

• Associate Professor, Department of Pharmacology, University of Pennsylvania School of Medicine, Philadelphia

https://www.pathology.columbia.edu/profile/emer-m-smyth-phd

Nerem erectile dysfunction at 65 buy vivanza 20 mg cheap, Dynamic shear stress regulation of inflammatory and thrombotic pathways in baboon endothelial outgrowth cells erectile dysfunction recovery time purchase 20 mg vivanza with mastercard, Tissue Eng erectile dysfunction pump youtube vivanza 20 mg buy otc. Hinds erectile dysfunction studies discount vivanza 20 mg on line, Endothelial outgrowth cells: function and performance in vascular grafts erectile dysfunction treatment tablets purchase 20 mg vivanza with visa, Tissue Eng. Haverich, Tissue engineering of vascular grafts: human cell seeding of decellularised porcine matrix, Eur. Badylak, the extracellular matrix as a biologic scaffold material, Biomaterials 28 (2007) 3587. Dimmeler, Mobilizing endothelial progenitor cells, Hypertension 45 (2005) 321­325. Castillo, Temporal profile of molecular signatures associated with circulating endothelial progenitor cells in human ischemic stroke, J. He, Granulocyte colony-stimulating factor attenuates monocrotaline-induced pulmonary hypertension by upregulating endothelial progenitor cells via the nitric oxide system, Exp. Heeschen, Erythropoietin is a potent physiologic stimulus for endothelial progenitor cell mobilization, Blood 102 (2003) 1340­1346. Popov, Irbesartan administration therapeutically influences circulating endothelial progenitor cell and microparticle mobilization by involvement of pro-inflammatory cytokines, Eur. Seifalian, Accelerating in situ endothelialisation of cardiovascular bypass grafts, Int. Khademhosseini, Surfacemodified hyaluronic acid hydrogels to capture endothelial progenitor cells, Soft Matter 6 (2010) 5120­5126. Masters, Differential support of cell adhesion and growth by copolymers of polyurethane with hyaluronic acid, J. Wilhelm, Design of biomimetic vascular grafts with magnetic endothelial patterning, Cell Transplant. Seifalian, Magnetic beads (Dynabead) toxicity to endothelial cells at high bead concentration: implication for tissue engineering of vascular prosthesis, Cell Biol. Thompson, Surface chemical and physical modification in stent technology for the treatment of coronary artery disease, J. Hamilton, Luminal surface engineering, "micro and nanopatterning": potential for self endothelialising vascular grafts Kastrati, Stent thrombosis and restenosis: what have we learned and where are we going Asada, Composition of thrombi in late drug-eluting stent thrombosis versus de novo acute myocardial infarction, Thromb. Shibata, Usefulness of rotational atherectomy in preventing polymer damage of everolimus-eluting stent in calcified coronary artery, J. Aoki, Complications of polymers on drug-eluting stents: looking toward polymer-free drug-eluting stents, Intern. Carroll, the evolution of cardiovascular stent materials and surfaces in response to clinical drivers: a review, Acta Biomater. McCormick, Some design considerations for polymer-free drug-eluting stents: a mathematical approach, Acta Biomater. Steinberg, Advances in stent technologies and their effect on clinical efficacy and safety, J. Hamm, Current status of bioresorbable scaffolds in the treatment of coronary artery disease, J. This page intentionally left blank Part Four Biomedical applications of hemocompatible biomaterials this page intentionally left blank Improving the hemocompatibility of stents H. As a result of the contact of blood with nonendothelial surfaces, several humoral and cellular systems can be activated. Exposure of blood proteins and cells to blood contacting stent materials can activate plasma proteolytic systems, fibrinolysis, complement cascade, and at least three cellular elements (leukocytes, endothelial cells, and platelets). Activation of these systems by various stent materials can result in nonlocalized systemic reactions, it also relates to the section on both improving hemocompatibility method and materials selection. Balloon expandable stents should have the ability to undergo plastic deformation and then maintain the required size once deployed [2]. Self-expanding stents should have sufficient elasticity to be compressed for delivery and then expand in the target area. Fully biodegradable stent represents the most ambitious emerging stent technology. The rationale is to provide a stable supporting force in the short term; the stent materials will disappear with the degradation in vivo, thus biodegradable stent is provided with minimizing restenosis due to vascular recoil, constrictive remodeling, and loose intimal dissection flaps [3]. A variety of coating materials are commonly used in an attempt to improve the performance of stents; including inorganic materials, polymers, and porous ceramics. This will result in the production of thrombin, plasmin, and proinflammatory cleavage products, C3a and C5a [4]. Although the production of proteolytic substances is initiated by proteins present in plasma, its amplification results are mainly from the contribution of cellular elements. As mentioned, the cellular reaction of blood to stent is not limited to platelet activation and aggregation. This will lead to more cells being available for interaction when vessel walls are wounded by the intervention of the stent. These cellular elements will bind to surfaces (both endothelial and nonendothelial) and adhesion of leukocytes will be followed by degranulation and release of factors that further contribute to reduced hemocompatibility. Endothelial cells will also respond to humoral signals to increase leukocyte adhesion and precoagulant activity. These alterations in cellular activity, will result in an inflammatory response that may have consequences beyond those tests of stent in vitro. It is well known that blood contact with stent surfaces can elicit platelet activation by a variety of mechanisms [5], including materials related alteration in blood flow that trigger shear-related platelet activation [6], and due to direct platelet adherence to the deposited protein layer on the stent surfaces, an event largely attributed to adsorption of fibrinogen [7]. Activated platelets undergo dramatic shape changes which promote aggregation with other platelets, and release platelet and pro-coagulant agonists [8]. The phospholipids of the platelet membrane also serve as the substrate for activated clotting factors, resulting in local amplification of the coagulation cascade. Aggregation of platelets, together with explosive activation of protein clotting factors, may result in significant thrombus accumulation in-stent. The protein clotting factors are a set of structurally similar serineproteases that circulate in the plasma as inactive proenzymes. After vascular injury during stent implanting, or through the introduction of foreign materials into the circulatory system, clotting factors are triggered and undergo activation in a sequential cascade-like fashion that culminates in the formation of a fibrin clot. This cascade consists of two pathways during stent implanting, tissue factor that is released due to vascular injury is the primary initiator of the extrinsic pathway [9]. The intrinsic pathway is considered the most critical pathway in biomaterial-associated thrombosis. In particular, the release of nickel, chromate, and molybdenum ions from stent materials may trigger local immune response and inflammatory reactions, which in turn may induce intimal hyperplasia and in-stent restenosis [13]. In vivo and ex vivo assessments in animal models or during clinical trials are possible. The test stent is compared to reference stent materials with known acceptable levels of hemolysis; furthermore the significant consequences was evaluated according to clinical application. Most of these methods are based on the observation that a certain proportion of platelets are removed from normal whole blood under controlled conditions of flow or pressure. This principle has been adapted to the quantification of the adhesion of other blood cells to materials surface. An alternative method is the direct counting of platelets adherent to a sample surface. Following exposure to blood or platelet-rich plasma under standardized conditions, the stent surface is rinsed to remove nonadherent platelets, fixed and prepared for either light or scanning electron microscopy. The number of adherent platelets per unit area is directly counted and their morphology is evaluated. In many circumstances a combination of one or more of these listed factors predicts the outcome. Structure of stent also influences the surface area and level of trauma that the blood encounters. Surface tension, the residual binding capability of the exposed surface, can affect the hemocompatibility of a material. The vessel wall being negatively charged causes platelets to be repelled and helps reduce thrombogenic potential. Distribution of charged sites and surface polarity will affect plasma protein absorption to the material. Modification of stent materials in one area may not solve all issues with regard to hemocompatibility. For example, hydrophilic substituents have a stimulatory effect on the complement cascade, but simultaneously have negligible effect on platelet activation. However, hydrophobic substituents show a reduced complement activation, but stimulate platelet adhesion. Generally, blending or mosaics are used to balance hydrophilic/hydrophobic properties to improve hemocompatibility. Surface films, such as inorganic film and drug-eluting coating have been widely applied to increase the biocompatibility of stents [23,24]. Researchers have focused on improving various surfaces to impart well with biofunctional surface. The techniques used for this purpose include deposition of a thin uniform coating, development of stable passivation oxide layer, ion beam processing for surface modification, and surface texturing. Ti-O film modified stents have shown good hemocompatibility and antithombosis property, and the outcome in clinic was also accepted. Huang [25] reported that the nonstoichiometrical titanium oxide films were obtained by ion beam deposition system. Hemocompatibility of the films was evaluated by clotting time, platelet adhesion and hemolysis analyses separately. Semiconductor property of nonstoichiometric titanium oxide films might be responsible for the improvement of hemocompatibility. Platelet adhesion experiments were done to examine the interaction between blood and the materials in vitro. The properties of TiNx films were correlated with their thrombogenicity involving platelet adhesion, activation, and protein clustering mechanisms. Liu [28,29] reported a simple approach to fabricate a copper-titanium film with the aim of imparting the stent with good hemocompatibility and accelerating endothelialization. In this work, copper-titanium films exhibited good hemocompatibility in vitro; however, the increase of Cu/Ti ratio could lead to increasing hemolysis ratio. Furthermore, the investigation of various copper-titanium coated stents in vivo was used to assess hemocompatibility. Amorphous hydrogenated SiC, a semiconductor, has been well known for its antithrombogenic properties [30]. Although in-vitro studies [33] provided encouraging results, the outcomes from the various human trials produced contradictory results. For instance, the presence of endothelialization was reported in a 6-month clinical follow-up of the Tenax coronary stent [34]. In contrast, results showing greater neointimal hyperplasia were observed in a 6-month clinical follow-up for SiC-coated stents in another study [35]. Hemocompatibility of C-N film betters with the increase in N/C atomic composition ratio and decrease in surface roughness. This made it a potential candidate for the applications in antifouling surfaces of blood-contacting biomedical devices. For this, a chemically hydroxylated titanium surface was 46 Clotting time (min) Clotting time Amount of platelet 52 180 Amount of platelet (unit area) Clotting time Amount of platelet 180 170 160 150 140 0. Improving the hemocompatibility of stents 389 aminosilanized, which was further used for covalent grafting of polyethylene glycol and the antibody. In vitro platelet adhesion analysis con- firmed superior hemocompatibility of the modified surface over the control. The coating is considered to improve patient safety by reducing the adherence of blood components and by inhibiting blood clotting. Heparin coated stent showed lessened humoral and cellular activation, in particular a reduced complement activation and enhanced platelet protection. This surface modification has led to a decrease in healthcare costs and an increase in patient safety owing to increased hemocompatibility of vessel stent. The main reason for the failure of systemic pharmacological therapy is the inability to deliver an adequate drug dose at the site of injury [41]. The concept of delivering medications at the injury site has evolved from paclitaxel-coated stents, in which loaded drugs will inhibit neointimal hyperplasia. Pharmacological inhibition of the key enzymes responsible for the consecutive activation of cascade of reactions, including aprotinin, tranexamic acid, aminocapron acid, C1-esterase inhibitor, antioxidants, and free radical scavengers are also under evaluation to improve hemocompatibility. Further research into the improvement of stent function by the local modification of the stent surface is ongoing and may prove to be one of the most exciting areas of research in this field. Due to relocking or a process of a permanent stent becoming inactive, there is a high chance that the patient is not receiving the proper care needed for the area of their body that is in need of a stent. Scientists have also found that biodegradable metallic material for stents may be more beneficial in the body than permanent metal due to a problem-causing agent called late stent thrombosis. Mg-based biodegradable material has the key advantage to reduce or even eliminate the late restenosis [42]. Besides, Mg has attracted most attention because of its 390 Hemocompatibility of Biomaterials for Clinical Applications role in many important biological functions and its hemocompatibility. The main problem of Mg for stent application is its rather rapid biodegradation, which occurs in the form of corrosion. This rapid corrosion could lead to loss of mechanical integrity and release of high concentration of degradation products. The stent demonstrated good biocompatibility and clinical trial has shown very promising results [44]. Fe has superior radial strength because of its higher elastic modulus, and has good biocompatibility owing to essential trace elements of human body.

In 29 patients with hypertrophic cardiomyopathy erectile dysfunction test video discount vivanza online amex, high fidelity pressure measurements of left ventricular out flow and left atrial pressures erectile dysfunction guide best order for vivanza, ascending aortic pressure erectile dysfunction jelly discount vivanza 20 mg on-line, cardiac output erectile dysfunction and causes cheap generic vivanza canada, and Doppler mitral flow velocity curves were obtained to evaluate cardiac function erectile dysfunction tools order discount vivanza online. There was also a prolongation of Tau, the time constant of left ventricu lar relaxation. In 21 patients with and 8 patients without resting left ventricu lar outflow obstruction, this alteration of systolic and diastolic function was characterized by a modest decrease in left ventricular outflow tract gradient from 73 ± 45 to 61 ± 41 mm Hg (P < 0. Previous studies [29, 30] have demonstrated a reduc tion in the left ventricular outflow gradient in patients with obstructive hypertrophic myopathy undergoing dualchamber pacing. The hypertrophied septum pro jecting into the left ventricular outflow tract produced highvelocity blood flow and resultant anterior motion of the mitral valve, which were deemed responsible for the obstruction. With altered contraction of the septum, a reduction in the displacement of the mitral valve appa ratus as well as an improved crosssectional area of the outflow tract was identified. A uniform response of the left ventricular outflow tract gradient to dualchamber pacing was not present. Although a statistically signifi cant decrease in gradient was noted with dualchamber pacing, some patients had no change, where others had a significant reduction. There remains a question as to whether the acute change in left ventricular outflow tract gradient in patients with hypertrophic obstructive cardiomyopathy can be used as a reliable indicator of a response to therapy [34]. Maron [34] stated in an editorial regarding the use of dualcham ber pacing that a continued examination of this modality for hypertrophic cardiomyopathy is warranted, especially in patients with both marked obstruction to left ventricu lar outflow and symptoms of congestive heart failure who are refractory to medical therapy. This subset of patients probably comprised only 5­10% of all patients with this clinical syndrome. Caution must be exercised in applying dualchamber pacing as a treatment for the complex dis ease characterized by an abnormally hypertrophied, non compliant left ventricle. Maron [34] also noted that pacing has no defined role in diminishing the risk for sud den cardiac death or in relieving symptoms of patients with nonobstructive hypertrophic myopathy. However, some patient sub groups may derive substantial benefit from this technique and thus further studies are warranted. As excellently reviewed by Criley and Segal [9] and Wigle [11, 15, 35], the spectrum of hypertrophic cardio myopathy with its attendant different hemodynamic presentations, morbidity and mortality and propensity for sudden death may be attributable to the derangement of cellular architecture. Whether obstruction occurs or is a functional result of ejection is related to the magnitude of myocardial muscle hyperdevelopment. Neither an intraventricular pressure gradient nor systolic anterior mitral valve motion is equated with the presence of ventricular obstruction. Unlike patients with ischemic cardiomyopathy, treating these symptoms often requires paradoxical therapy directed at reducing the adverse effects of the hypercontractile myo cardium. Although beneficial in many types of ischemic heart disease or congestive heart failure, digitalis, sympa thomimetic amines, and preloadreducing pharmacologic therapy are detrimental in patients with hypertrophic myopathy, often exacerbating symptoms. Persistent dyspnea and near syncope on minimal exertion occurred daily, despite treatment with multiple negative inotropic medications. Twodimensional and Doppler echocardi ography demonstrated a substantial intraventricular pressure gradient and severe mitral regurgitation with an enlarged left atrium. Cardiac cath eterization demonstrated a significant resting intraven tricular gradient of 60 mm Hg with normal coronary arteries, and normal right heart hemodynamics prompted the patient to elect the alcohol septal ablation procedure. The right and left femoral arteries and veins were cannulated using 6 F and 8 F sheaths, respectively. A 5 F balloontipped 182 Hypertrophic Obstructive Cardiomyopathy pacemaker was inserted through the right femoral vein to the right ventricle. A 6 F multipurpose catheter was also positioned in the right ventricle from the left femo ral vein. The first large septal artery was cannulated using a large double 45° bend on a 0. For contrast opaci fication of the hypertrophied septum, Optison (Mallinckrodt, St. The echo contrast opacified the protruding septum at the site of the highest velocity in the left ventricular outflow tract. Following echocardiographic confirma tion of correct septal branch occlusion, 3 cc of 98% dehydrated alcohol was delivered slowly into the septal artery over 5 min, followed by a 5min waiting period. Angiographic frames showing first large septal artery (left), septal balloon occlusion (middle), and occluded septal artery after procedure (right). Angiography of two large septal arteries (middle left) and sequential balloon occlusion and alcohol ablation (middle left, right, and far right). After the 5min period following alcohol administration, the occluding balloon catheter was deflated and with drawn. The junctional rhythm and, to some degree, the infarcted septal activity likely accounted for the reduction in arterial pressure from 140/78 to 100/76 mm Hg. There was no significant change in the left ventricular enddiastolic pressure (28 to 32 mm Hg, pre vs. There was no significant change in right ventricular pressures after septal infarction. That afternoon the patient could, for the first time, walk the hallway without symptoms. An echocardiogram demonstrated severe left ventricular hypertrophy, an abnormal left ventricular outflow tract 184 Hypertrophic Obstructive Cardiomyopathy Table 11. There is an 0 mm Hg resting left ventricular outflow tract gradient (top) and 130 mm Hg postpremature ventricular contraction gradient between the aortic and left ventricular pressures (lower, beat #2). Electrocardiogram showed normal sinus rhythm with severe left ventricular hypertrophy. Left anterior descending coro nary flow reserve was also measured as in the first patient. Echo contrast (3 cc Optison, diluted 1:10) opacified only the top part of the obstructing septal muscle. Following echo contrast imaging, 3 cc of 98% dehydrated alcohol was delivered into the first septal artery over 5 min with a 5min waiting period following alcohol administration, observing hemodynamics continuously. Following the waiting period, the balloon catheter was withdrawn, and coro nary arteriography and coronary flow reserve of the left anterior descending coronary artery were repeated. During Valsalva maneuver (bottom middle), there is a minimal 20 mm Hg increase in the resting gradient. Left ventricular enddiastolic pressure is approximately 30 mm Hg with a prominent A wave. The rapid upslope of the aortic pressure is still demonstrated in the femoral artery. A spike and dome pattern is clearly evident on the central aortic pressure in contrast to the femoral artery pressure. It is interesting to note the increased arterial pressure (130/70 to 150/80 mm Hg) after septal ablation. Regarding coronary flow reserve, coronary flow reserve in the left anterior descending artery increased from 1. Systolic flow reversal demonstrated prior to septal ablation was not seen afterward. At the conclusion of the procedure, the vascular sheaths and temporary pacemaker were secured in place. The pathophysiology of hypertrophic cardiomyopathy suggests that four therapeutic approaches may provide important symptomatic benefit. The alteration of contractile Hemodynamic Effects of AlcoholInduced Septal Infarction 187 events minimizes the obstructing septal contraction, reducing the narrowing of the left ventricular outflow tract. The duration of sympto matic benefit of dualchamber pacing has been reported to extend over a 5year followup period [44]. Prolonged pacing alters the electrical and hemodynamic properties of the myocardium [45]. These alterations are associ ated with reduced angina and improved myocardial per fusion by stress imaging, with reduction in left ventricular cavity dilatation [29­31]. Although effective in enlarging the left ventricular out flow tract and altering the left ventricular contractile sequence, septal myectomy is a complicated, openchest surgical procedure with a mortality risk approaching 5% and a high incidence of intraventricular conduction block requiring a permanent pacemaker [28, 46, 47]. The longterm anticoagulation and its late prosthetic valve dysfunction make this an option of last resort. The most recent technique, the induced septal infarc tion of the subaortic portion of the intraventricular sep tum by balloon occlusion with instillation of alcohol, as in our two patients, has been demonstrated to be a hemodynamically effective method of reducing left ven tricular outflow tract obstruction. This procedure was first performed in 1995 by Sigwart [37], who noted that a brief septal artery balloon occlusion caused transient reduction in the outflow pressure gradient, and that localized septal infarction with ethanol in three patients was effective over a longer followup. Eighteen patients underwent selective intraseptal alcohol injec tion to reduce left ventricular outflow obstruction. Doppler echo evaluation of left ventricular outflow gra dients was performed before the procedure on the first postoperative day and at threemonth followup. Exercise testing and degree of symptom reduction three months after the procedure were also evaluated. Following the procedure, there was a significant reduc tion in the mean left ventricular outflow obstruction gradient (67 to 25 mm Hg; P < 0. At three months, the left ventricular outflow tract gradient stabilized at 22 mm Hg. The reduction in left ventricular outflow obstruction was associated with marked improvement in symptoms, but an insignificant increase in exercise capacity in 10 patients of 25% time to symptoms. The complications in the first 18 patients included chest discomfort lasting from 1 to 2 min, which was treated with intravenous opiate analgesia. Two patients had ventricular arrhythmias, one secondary to severe bradycardia during sheath removal. Arterial patency was restored by the following day without any long term adverse events. This complication was attributed to inadequate balloon occlusion of the first septal artery. This event led the investigators to caution operators that the balloon should not be positioned too proxi mally and should be of adequate size to prevent leakage. Injection of contrast into the septal artery through the balloon will ensure appropriate sealing of the septal artery prior to alcohol instillation, thus eliminating this complication. Threemonth followup of the left ven tricular outflow tract gradient in 22 of 25 patients dem onstrated a reduction from 62 ± 30 mm Hg (range 4­152 mm Hg) to 19 ± 21 mm Hg (range 0­74 mm Hg). One patient, an 86year old woman, died 8 days after alcohol septal ablation from ventricular fibrillation. This patient was taking beta sympathomimetics for chronic obstructive pulmonary disease. On average, patients were discharged 11 days (range 5­24 days) after the procedure. Twentyone patients decreased their New York Heart Association functional class from 3. A further reduction in left ventricular outflow tract gradient occurred in 14 patients. It has also been noted that hyper trophic left ventricular outflow tract obstruction is a highly variable condition [49] and may be induced by alterations of preload and intrathoracic pressures (cough, Valsalva maneuver). Functional mitral regurgi tation due to increasing and adverse hemodynamic effects of systolic anterior motion of the mitral valve with increasing left ventricular outflow tract obstruc tion may also be the cause of disabling symptoms. Therapies that reduce intraventricular pressure gradients appear to improve myocardial perfusion and reduce clinical symptoms [52, 53]. As shown in the two case examples, septal ablation using ethanol infused into one or more of the septal perforators at the site of outflow obstruction produces significant reduction in left ventricular pressure and can improve clinical symptoms. Complications of Alcohol Septal Ablation Several authorities have expressed concern over the potential early and late complications of alcohol septal ablation [42­45, 47, 48]. Alcoholinduced septal infarc tion is a controlled myocardial infarction with its attendant complications, which may include conduction abnormalities, some requiring permanent pacemaker implantation in approximately 20­30% of patients [38, 39]. Conduction abnormalities resulting from sep tal infarction may increase the propensity for late com plete heart block. Induced septal infarction may theoretically aggravate left ventricular dysfunction in the late course. Left ventricular hypertrophy eventually results in left ven tricular remodeling with impairment of contractility, despite an increased left ventricular wall thickness. Low wall stress and small left ventricular volume, although associated with a hypercontractile left ventricle, may obscure impaired systolic left ventricular function. In the late phase, alteration of myocytes, generation of fibrosis, myocardial cellular energy depletion, and dias tolic dysfunction ultimately result in cardiac failure with left ventricular thinning. Whether the reduction in left ventricular pressure gradient at the time of septal abla tion results in reduced left ventricular filling and improved myocardial perfusion with a delay of adverse events associated with left ventricular remodeling remains to be seen. He has reported orthopnea and has been sleeping on a reclining chair for the last 2­3 years. Dizziness and lightheadedness with positional changes occur commonly, although he has not been hos pitalized for heart failure. He had been treated for hyper tension, hyperlipidemia, benign prostatic hypertrophy, and depression. This reproducible provocation of the left ventricular outflow tract gradient is quite evident on this tracing. Echocardiography demonstrated peak left ventricular outflow tract gradient of 71 mm Hg with asymmetric sep tal hypertrophy and systolic anterior wall motion of the mitral valve. Cardiac catheterization with alcohol septal ablation for left ventricular outflow tract obstruction was performed using the right femoral artery with a 6 F vascu lar sheath, right femoral vein with a 6 F vascular sheath, and left femoral artery with a 5 F arterial sheath. Leftheart pressures were recorded using a 5 F pigtail catheter to the left ventricle and a 6 F pigtail catheter in the aorta from the right femoral artery. Selective coronary arteriography was performed fol lowed by coronary angioplasty balloon placement of 2 × 9 mm over the wire balloon into the second septal branch. After septal balloon occlusion, contrast cinefluoroscopy and contrast bubble imaging by echo demonstrated that the septum was supplied by this vessel. Fluoroscopy confirmed that the septal branch had been ablated and that on echocardiography in the catheterization labora tory, there was akinesis of the proximal septum. At the conclusion of the procedure, the right femoral sheath was removed and closed with 6 F Perclose device; the left femoral sheath was removed using manual compression and a pacing wire via the right femoral vein was sutured and remained in place for 24 hours.

C the risk of second primary malignancy in patients who have had a squamous cell carcinoma of the head and neck is significantly increased compared with the age-matched general population erectile dysfunction medication with no side effects 20 mg vivanza order mastercard. The risk is primarily for the development of second primaries of the aerodigestive tract erectile dysfunction qarshi purchase vivanza overnight delivery, likely related to the "field cancerization" effect of tobacco and alcohol use impotence natural home remedies order on line vivanza. Second primaries are most commonly identified in the head and neck erectile dysfunction urologist order vivanza 20 mg, lung erectile dysfunction drug vivanza 20 mg buy fast delivery, and esophageal regions. One series found that patients with larynx cancer were more likely to develop second primaries of the lung, 125 whereas patients with squamous cell carcinoma of the oral cavity were more likely to develop second primaries in the head and neck. Surgery is preferred for early stage oral cavity tumors (including lip, floor of mouth, and oral tongue) in most cases, given the risk of osteoradionecrosis from definitive radiation. Surgical resection of the nasopharyngeal tumor is not the primary treatment modality because of the deep anatomical location of the nasopharynx and its proximity to critical structures. C Epstein-Barr virus infection is associated with the development of nasopharynx cancer and not squamous cell carcinoma of the head and neck. E Brain metastases are unlikely to be identified at diagnosis in an individual with head and neck squamous cell carcinoma. B Nonkeratinizing nasopharynx cancer is an endemic disease process in Southeast Asia and is causally related to Epstein-Barr virus infection. B Prior solid organ or bone marrow transplantation, especially when coupled with long-term immunosuppression, increases the risk of developing head and neck squamous cell carcinoma. A Concurrent chemoradiotherapy is a standard treatment approach for individuals with locally advanced larynx cancer who desire an organ-sparing approach. B For elderly patients with significant comorbidities, which limit the ability to provide an organ-sparing approach, total laryngectomy can provide the best opportunity for long-term disease-free survival. The extent of disease in this case makes radiotherapy alone unlikely to provide a durable benefit. C Concurrent chemoradiotherapy provides at least equivalent outcomes in locally advanced head and neck cancer when compared with surgery, and provides the benefit of organ preservation in appropriately selected patients. A Otalgia is not commonly reported as a side effect in individuals undergoing concurrent chemoradiotherapy for head and neck squamous cell carcinoma. While some responses have been reported to targeted agents in this disease, local therapies are preferred in the oligometastatic setting. C Anaplastic thyroid cancer, when organ confined, is amenable to combined modality treatment, and such treatment can provide a survival benefit to patients. Unfortunately, only a minority of patients have a complete resection of anaplastic thyroid cancer. E Given the rapidly progressive disease shortly after chemoradiotherapy, it is unlikely that this patient will benefit from further systemic therapy. While investigational protocols should be considered in a willing patient, it is unlikely that chemotherapy will be beneficial in this case. Such individuals should be screened for evidence of multiple endocrine neoplasia 2. These studies have, in aggregate, not suggested an improvement in treatment outcome with this approach despite a reduction in the rate of distant metastases following definitive therapy. D While it can be associated with significant toxicity, bolus cisplatin administered at 100 mg/m2 every 3 weeks during radiotherapy is the best supported chemotherapy regimen for concurrent chemoradiation in a patient with a good performance status. While other cisplatin regimens have been studied, direct comparisons to a higher dose are lacking. Carboplatin is typically reserved in cases in which an individual cannot tolerate cisplatin. B Locally advanced cancers of the oral cavity are often highly aggressive in their biology and require multidisciplinary management. For individuals with good performance status, this would combine surgical resection with appropriate adjuvant therapy. D In an individual with early stage nasopharynx cancer (T1 in this case) radiotherapy alone is associated with a high rate of cure greater than 90% and less morbidity than many other approaches. E Concurrent chemoradiotherapy remains the standard of care for locally advanced nasopharynx cancer. Adjuvant chemotherapy following chemoradiotherapy may be beneficial in some cases and has been extensively evaluated with mixed results. A Pleomorphic adenomas are the most common parotid tumor and can typically be cured with excision. Some pleomorphic adenomas can recur following surgery, and the potential does exist for malignant transformation. Radiotherapy plus cetuximab for locoregionally advanced head and neck cancer: 5-year survival data from a phase 3 randomised trial, and relation between cetuximab-induced rash and survival. Tobacco smoking and increased risk of death and progression for patients with p16-positive and p16-negative oropharyngeal cancer. Second primary malignancy of the aerodigestive tract in patients treated for cancer of the oral cavity and larynx. Gemcitabine plus cisplatin versus fluorouracil plus cisplatin in recurrent or metastatic nasopharyngeal carcinoma: a multicentre, randomised, open-label, phase 3 trial. Pulmonary metastasectomy for pulmonary metastases of head and neck squamous cell carcinomas. Total laryngectomy versus larynx preservation for T4a larynx cancer: patterns of care and survival outcomes. Radiation-induced salivary gland dysfunction results from p53-dependent apoptosis. Risk, outcomes, and costs of radiation-induced oral mucositis among patients with head-and-neck malignancies. Combined treatment of anaplastic thyroid carcinoma with surgery, chemotherapy, and hyperfractionated accelerated external radiotherapy. American Thyroid Association guidelines for management of patients with anaplastic thyroid cancer. Postoperative irradiation with or without concomitant chemotherapy for locally advanced head and neck cancer. Treatment results for nasopharyngeal carcinoma in the modern era: the Hong Kong experience. A 59-year-old woman presents with progressive solid food dysphagia and weight loss. Endoscopy reveals a 5-cm distal esophageal mass, with a biopsy showing poorly differentiated squamous cancer. The patient is interested in further therapy and would like to be referred for a clinical trial. Given the benefit from prior ramucirumab, refer for a trial evaluating regorafenib versus placebo C. A 65-year-old African American male with a longstanding history of smoking and daily alcohol use presents with a 25-pound weight loss and progressive solid food dysphagia. Endoscopy reveals a mass extending from 25 to 28 cm from the incisors, partially obstructing and circumferential. He has hypertension and hyperlipidemia and had a myocardial infarction 5 years ago complicated by mild congestive heart failure, and he recently had an echocardiogram documenting an ejection fraction of 30%. Trastuzumab can be included safely as part of chemotherapy, as cardiac toxicity is rarely if ever seen with fluoropyrimidine/platinum chemotherapy. Trastuzumab should be avoided, given the risk of increasing congestive heart failure. Endoscopic ultrasound reveals a T3N1 lesion, and there is evidence of 2­3 cm celiac lymph nodes. He undergoes a staging laparoscopy, which grossly appears normal, but three peritoneal washings indicate a positive cytology for adenocarcinoma. Preoperative combined chemoradiotherapy followed by esophagogastrectomy 128 Esophageal Cancer periesophageal lymph nodes. Concurrent radiation and chemotherapy with a fluoropyrimidine and a platinum agent E. A 75-year-old woman is found to be anemic, and on physical examination has palpable left supraclavicular adenopathy. She has a history of hypertension and mild congestive heart failure, with an ejection fraction on echocardiogram of 30%. She has no medical comorbidities and now presents with a follow-up endoscopy, which shows a persistent short segment of Barrett esophagus. On four-quadrant biopsy analysis, she is found to have evidence of high-grade dysplasia on multiple biopsies, but no evidence of cancer. A 68-year-old male with a longstanding history of smoking presents with dysphagia and weight loss. Endoscopy reveals a mass in the distal esophagus extending from 35 to 40 cm and partially obstructing. A biopsy of the mass reveals a poorly differentiated, high-grade neuroendocrine tumor. You meet with the patient to discuss therapy options, and you advise him to do which of the following Consider combined chemoradiotherapy with etoposide, a platinum agent, and radiotherapy E. Proceed with paclitaxel and carboplatin and radiation therapy followed by surgery 10. A 40-year-old advertising executive with longstanding esophageal reflux and a history of short segment Barrett esophagus is found on follow-up endoscopy to have 129 persistent Barrett esophagus with no dysplasia, but on biopsy there is a focus of invasive adenocarcinoma. Endoscopy with ultrasound suggests a possible small T1 lesion, with no evidence of regional adenopathy. Preoperative carboplatin, paclitaxel, and radiotherapy followed by esophagectomy 11. On further questioning, he reports a maternal aunt who died of uterine cancer at 45, and his mother was treated for colon cancer at age 50. A maternal grandmother died of pancreatic cancer at age 55, and a maternal aunt was treated for breast cancer at age 70. You advise the patient that his next chemotherapy regimen should consist of which of the following A 55-year-old lawyer was recently diagnosed with esophageal adenocarcinoma with metastatic disease to lung, mediastinum, and abdominal lymph nodes. Esophagectomy followed by adjuvant fluoropyrimidine- and cisplatin-based chemotherapy, sequenced with postoperative fluoropyrimidine and radiation therapy B. Preoperative weekly carboplatin, paclitaxel, and radiotherapy followed by esophagectomy E. Cetuximab combined with a fluorinated pyrimidine and either cisplatin or oxaliplatin B. An obese 55-year-old with longstanding esophageal reflux presents with progressive dysphagia and odynophagia. Trastuzumab does not increase cardiotoxicity when given with fluorinated pyrimidine/platinum­based chemotherapy. A the patient is elderly with significant medical comorbidities and is not likely a surgical candidate for esophagectomy. That being said, he may be a candidate for primary chemoradiotherapy without surgery. Randomized trials have suggested improvement in local tumor control, without a clear-cut improvement in survival for adding surgery to upfront chemoradiotherapy in esophageal squamous cancer. Recent studies have questioned whether adding epirubicin to two-drug chemotherapy offers any benefit, and studies in patients over the age of 65 have not shown a survival benefit for adding a taxane to a fluoropyrimidine/platinum doublet. In a patient with adequate functional status, combination chemotherapy is preferred over monotherapy. Morbidity and mortality are clearly lower than as well as less invasive than surgery. D Extrapulmonary small cell high-grade neuroendocrine tumors are treated similar to small cell lung cancer. For limited stage disease that can be encompassed in a radiotherapy field, concurrent etoposide/platinum radiation therapy is a reasonable treatment option, even without surgery, given the high rate of systemic recurrence in this histology. Several case series indicate long-term survival in such patients treated with primary chemoradiotherapy. D For a superficial T1 esophageal cancer, an attempt at endoscopic mucosal resection should be made. There is controversy about more deeply penetrating T1b lesions, which may have higher rates of nodal involvement. The hallmark cancers, colon and uterine cancer, were present in two blood relatives at a young age, and Lynch syndrome can also be associated with pancreatic cancer and esophagogastric adenocarcinoma. There is no evidence that continuing trastuzumab into second-line chemotherapy improves outcome. There are no data supporting the addition of epirubicin to fluorinated pyrimidine/platinum­based chemotherapy at disease progression. Positive peritoneal cytology in patients with gastric cancer: natural history and outcome of 291 patients. Chemoradiation with or without surgery in patients with locally advanced squamous cell carcinoma of the esophagus. Chemotherapy followed by surgery compared with surgery alone for localized esophageal cancer. Combined chemotherapy and radiotherapy compared with radiotherapy alone in patients with cancer of the esophagus. Small-cell carcinoma of the esophagus and gastroesophageal junction: review of the Memorial Sloan-Kettering experience.

The treatment of any patient in whom these physiologic changes are expected should be optimized prior to engaging in any transcatheter procedure erectile dysfunction zoloft generic vivanza 20 mg, and include aggressive diu retic therapy as well as afterloadreducing agents impotence blood pressure medication cheap vivanza express. If a patient erectile dysfunction treatment saudi arabia order vivanza with paypal, despite appropriate pretreatment erectile dysfunction treatment history buy vivanza 20 mg online, still devel ops significant left atrial hypertension after test occlu sion erectile dysfunction age young discount vivanza 20 mg with mastercard, the placement of a fenestrated device may be beneficial [20, 21]. Persistent Arterial Duct Associated with Preductal Coarctation of the Aorta A 14monthold male infant was initially evaluated for a cardiac murmur. On physical examination he did not have an upperto lower limb blood pressure gradient and femoral pulses were felt to be adequate without brachialfem oral delay. The branch pulmo nary arteries appeared to be of normal size with lami nar flow across. The aortic arch was not very well visualized and there was a mild degree of left ventri cle volume overload. This case documents the need to pay particular atten tion to hemodynamic recordings even in "standard" situ ations. The unexpected finding of primary coarctation could easily be missed if not looked for appropriately. Note the resolution of the ascendingtodescending aortic gradient as well as the decrease in pulse pressure in the ascending aorta. Ventricular Tachycardia Arrest Nine Months after Surgical Ventricular Septal Defect Closure: Mitral Insufficiency with Subaortic Stenosis A 22monthold white male with trisomy 21 presented acutely with diaphoresis and vomiting. The degree of subaortic stenosis had remained unchanged since surgical repair and therefore he was fol lowed medically to delay the possible need for mitral valve replacement. The patient was taken to the cardiac catheterization laboratory for hemodynamic evaluation and delineation of the coronary anatomy. Given the severity of the near miss event, it was felt that surgical repair was mandatory, even though each hemodynamic lesion on its own would not necessarily be a clear indication for surgical intervention. This case again demonstrates the necessity for accurate hemodynamic evaluation in patients with congenital heart disease. Discrete subaortic stenoses can otherwise easily be missed and surgeons may then find themselves attempt ing to repair or replace a valve which is not the cause of the underlying hemodynamic alteration. Again, subtle changes of the pulmonary capillary wedge tracings may Case tudies inhCongenital Cardiai Anomalies 375 (c) 1s 2 3 4! Hemodynamic evaluation of congenital cardiac lesions frequently neces sitates the assessment of the pulmonary vascular bed and, as such, nitric oxide needs to be readily available to allow assessment of pulmonary vascular reactivity. Summary Congenital anomalies are unusual in adults, but charac teristic hemodynamic data facilitate precise diagnoses (Table 20. A complete evaluation, including assessment for intracardiac shunts, is usually indicated in patients prior to major surgical procedures or electro physiologic interventions. Cooperative study on cardiac catheterization: Total population studied, procedures employed and incidence of complication. Measurement of lefttoright intracardiac shunting in adults: Oximetric versus indicator dilution techniques. Masked left ventricular restriction in elderly patients with atrial septal defects: A contraindication for closure Closure of a moderately large atrial septal defect with a selffabricated fenestrated Amplatzer septal occluder in an 85yearold patient with reduced diastolic elasticity of the left ventricle. Most if not all of the heterotopic heart patients may never be seen again in clinical practice, since the technique has been made obsolete. Nonetheless, assisted pressure pulsation systems, either biological or mechanical, often produce confusing and interesting hemodynamic waveforms. The principles applied to interpreting hemodynamics in native hearts are even more important when examined in this context. This article has several of the most unusual hemodynamic tracings illustrating the concept. In this way, the curiosities of pressure delivery in functioning and nonfunctioning extra hearts will be even more educational. The catheter position is unchanged and aortic pressure continues around 120/70 mm Hg. Consider another patient, a 37yearold man having had the same procedure as the preceding patient. The "surgical" treatment for refractory idiopathic congestive heart failure was successful. Explain the systolic arterial pressure wave in the absence of apparent high grade atrial or ventricular ectopy. Heterotopic heart transplantation has a long experimental history and was the technique used by Christian Barnard and his colleagues in South Africa when performing the first clinical heart transplantation in 1967. Although 95% of all heart transplantations done in 1990 were orthotopic replacements, heterotopic heart transplantation is indicated in patients with pulmonary hypertension who need left ventricular assistance, but has fallen into obsolescence. Orthotopic replacement of a "new" donor heart, unaccustomed to high pulmonary artery pressures, would result in severe, potentially fatal right ventricular failure after transplantation. For historical background, the vascular communications of heterotopic transplantation are varied [2]. One common method used in the patient examples is as follows: the aorta of the accessory (donor) heart is attached end to side directly to the aorta of the native heart and the donor pulmonary artery by graft to the native pulmonary artery. Because of longstanding pulmonary hypertension, a surgical procedure was performed (to be discussed below). Measurement of aortic pressure was obtained through an 8 F femoral side arm sheath. Can you explain the waveform configuration and pressure generation of beats #4, 5 and 6 on this figure Before Hemodynamic Rounds: Interpretation of Cardiac Pathophysiology from Pressure Waveform Analysis, Fourth Edition. A communication between both left atria is created (large "atrial" septal defect) to allow filling of the donor left ventricle. Since the function of the native left ventricle is generally very poor and, at times, insufficient to influence systemic pressure, the arterial pulse depends principally on the Frank­Starling mechanism of filling of the donor heart. However, the electrocardiographic complex which is most prominent may not be that of the native heart, often accounting for the disparity between electrocardiographic rhythm and pressure waves. There are several advantages of heterotopic over orthotopic heart transplantation. Heterotopic heart transplantation allows for possible recovery of recipient heart failure after viral myocarditis, and can be performed in the presence of very high pulmonary vascular resistance, as the hypertrophied native right ventricle continues to support the pulmonary circulation. However, the transplanted heterotopic heart patient also carries a severe risk of systemic emboli from thrombus in the poorly contracting recipient left ventricle and requires longterm anticoagulation. Moreover, the native ventricle may be subject to continuing angina related to ischemic cardiomyopathy. Customary hemodynamic waveforms may be significantly affected by the dysrhythmic activity of the recipient heart, occasionally requiring high doses of antiarrhythmic agents. Abnormal hemodynamic patterns of donor left ventricular pressure may indicate early transplant rejection. Failing function of the heterotopic transplant often appears as a significant decline in the magnitude and slowed and diminished pattern of the peripheral pressure wave. The ratio of the arterial pulse of each of the two contracting ventricles is thought to be an indicator of impending cardiac rejection [2]. The subtle small waves in the electrocardiogram mistakenly appearing as P waves are the electrocardiographic complexes of the donor heart, with the largest complexes being the native heart. However, in patients with reduced native left ventricular function insufficient to exceed systemic pressure, the magnitude of arterial pressure is dependent on donor heart R­R interval and Frank­ Starling filling force relationship. The intrinsic cardiac rhythm for many patients may be atrial fibrillation, with the donor heart in a sinus rhythm. Synchrony of the two hearts was maintained for long periods of time, giving the impression that native left ventricular pressure was sufficient to generate adequate pressure in the systemic circulation. The size of the aortic pulse waves depends on the copulsation or counterpulsation. Synchrony of the two left ventricular pressures produces a large aortic pulse (X beat). The next beat barely generates a small arterial pulse wave with only the native left ventricular pressure. The following beat (Y beat) has both left ventricular pressures, but the native left ventricle is not filled adequately preceding the "premature" contraction. The hemodynamic responses of the two ventricles over time become clinically important when considering early allograft rejection. A 52yearold man had received (a) 1 sec orthotopic transplant one year prior to study. Although uncommon, atrial contraction stimulated from the remaining native atrial tissue can produce this pressure artifact. The dyssynchronous atrial contraction superimposed on right ventricular systole may be appreciated on beat #2. Although hemodynamically interesting, atrial dyssynchrony does not present a serious clinical problem. Applying the traditional hemodynamic principles to the cardiac cycle with its attendant electricalmechanical events is complicated in patients with "extra" hearts. When nonphysiologic events are present, investigate all possible sources of artifact along the fluid path to the transducer, catheter malposition, and congenital or "acquired" anatomic anomalies. The pressure waves generated by mechanical assist device as an extra heart may be the result of two principal modes: either partial or complete support of systemic pressure. The total artificial heart is another of several types of these complete support devices. Pressure waves generated by these devices depend on the contribution and timing of both mechanical and intrinsic myocardial pulsatile activity. Myocardial Ischemia and the Extra Heart A 52yearold man with severe coronary artery disease underwent coronary artery bypass graft surgery after a complicated myocardial infarction in 1985 [7]. Because of progressive ischemia and atherosclerosis in the saphenous vein grafts, a second coronary artery bypass surgery, complicated by a cardiac arrest, was performed. Successful resuscitation was accomplished with the institution of a left ventricular cardiac assist device. The patient did well for nine months after device implantation, while awaiting cardiac transplantation. Despite a wellfunctioning assist device, angina pectoris with decreasing exercise tolerance became incapacitating. The waveform of aortic pressure indicates that an extra heart must be performing the work to generate a systemic pulse. Note that the electrocardiogram does not correlate to the aortic pressure, but does precede each left ventricular pressure wave. The Novacor and other similar pulsatile ventricular support devices function by employing volume triggers, producing a pressure pulse when the "new" left ventricle is passively filled to a predetermined volume. Aortic pressure is generated in a pulsatile manner unrelated to left ventricular pressure. Note the correspondence of pressures of the left and right ventricles in most beats. Reduced left ventricular pressure occurs when the timing of pump filling (b) (a) exceeds the timing of the native left ventricular ejection, and thereby results in the alteration of left ventricular pressures. To assess the etiology of cardiac dysfunction, coronary angiography was performed and showed total occlusion of the left anterior descending, right coronary, and circumflex arteries. The single saphenous vein graft to the right coronary artery had a 50% ostial narrowing with mid graft 90% lesion. In the lower right corner is a continuous signal of pulmonary artery oxygen saturation, showing a decline at peak exercise from 78% to approximately 40%. Exercise increased the assisted heart rate (103 to 113 beats/min), mean arterial pressure (99 to 128 mm Hg), aortic diastolic pressure (88 to 115 mm Hg), left ventricular enddiastolic pressure (18 to 25 mm Hg), and pulmonary artery pressure (45/15 to 75/28 mm Hg). Cardiac output (by thermodilution and confirmed by the console values) rose minimally (5. Coronary blood flow (great cardiac vein) increased (43 to 56 min) with only modest lactate generation. Consider the hemodynamic results of exercise in this patient with a left ventricular assist device with regard to exercise responses in normal subjects. Exercise normally increases heart rate by more than 25%, decreases aortic diastolic pressure due to decreased systemic vascular resistance, minimally changes right ventricular and pulmonary artery pressures, and markedly increases cardiac output and coronary blood flow at least fourfold. In our patient, the blunted heart rate and the increase in diastolic aortic and mean systemic pressures indicate a failure to lower systemic vascular resistance ortaaale arrroosallonarry ryoass 389 Table 21. The decline in pulmonary artery oxygen saturation is a markedly exaggerated response compared to a normal subject. The increase in pulmonary artery pressures also required explanation, with a left ventricular pump which is presumed to be substituting for native left ventricular work. The limited capacity of the assist pump to empty the native left ventricle results in increased left ventricular enddiastolic pressure and also pulmonary pressures. As one might anticipate, limited coronary blood flow through this severely diseased heart might be due to arterial conduit blockage, as well as attenuated oxygen demand, with myocardial muscle performance supplemented by mechanical support. We speculate that the marked increase in pulmonary pressures reflects ischemia from the inferior left ventricular and right ventricular functioning zones. Right ventricular ischemia in the unassisted right ventricle might well be the cause of progressive dyspnea, with compromised function of the remaining active myocardium of the inferior and lateral walls. Progression of coronary artery disease in the right coronary artery bypass graft (the only remaining arterial blood supply) was evident. Limited blood flow to the inferior left ventricular distribution most likely affected the pressure responses to exercise. Unfortunately, a complete answer to the questions raised cannot be provided from the hemodynamic data alone.

Kern Pathophysiologic derangements of cardiac anatomic components and mechanics manifest as "cardinal" car diovascular symptoms impotence nutrition discount 20 mg vivanza with mastercard, most of which are reflected in distinct hemodynamic disturbances erectile dysfunction causes cycling buy genuine vivanza on line. These sympto matic­hemodynamic constellations include (i) dyspnea erectile dysfunction drugs with the least side effects 20 mg vivanza order amex, reflecting pulmonary venous congestion; (ii) fatigue erectile dysfunction caused by surgery purchase vivanza online, attributable to inadequate cardiac output; (iii) syncope erectile dysfunction drugs new 20 mg vivanza order otc, resulting from transient profound hypotension; and (iv) peripheral edema, related to systemic venous conges tion. Chest pain typically suggesting ischemia does not usually result directly from primary hemodynamic derangements, does not lend itself to this anatomic­ pathophysiologic hemodynamic approach, and will not be addressed in these discussions. It is important to emphasize that these symptom groups in isolation are nonspecific. Identical complaints reflecting disparate pathophysiologic processes can occur due to a variety of mechanisms. For example, dyspnea is an expected symptomatic manifestation of pulmonary venous hypertension attributable to a spec trum of leftheart derangements, the underlying mecha nisms of which vary greatly. Dyspnea is also commonly of pulmonary origin, with circumstances in which the heart may be completely normal or impacted only as an innocent bystander. Similarly, peripheral edema and ascites reflect systemic venous congestion resulting from a spectrum of right heart failure mechanisms. Thus, for cardiovascular assessment, symptoms and signs must be characterized according to the underlying anatomic­ pathophysiologic mechanisms. To establish an anatomic­pathophysiologic differen tial diagnosis, first consider the anatomic cardiac com ponents (myocardium, valves, arteries, pericardium, and conduction tissue) that may be involved and then focus on the fundamental mechanisms that impact each ana tomic component, finally asking how such anatomic­ pathophysiologic derangements and hemodynamic perturbations are reflected in the symptoms, physical signs, and invasive waveforms. Cardiac Mechanical Function and Hemodynamics Hemodynamic assessment is an integral part of the ana tomic­physiologic approach to circulatory pathophysi ology, employing bedside examination with confirmatory or complementary invasive and noninvasive (echo Doppler data) hemodynamic information. The purpose of the cardiovascular system is to gener ate cardiac output to perfuse the body. Organ perfusion is determined by arterial driving pressure modulated by vascular bed resistances. Thus, circuit output or current flow is a function of the "driving" voltage divided by circuit resistance, or I = V/R. Systemic vascular resistance is determined by total blood volume and vascular tone (a function of intrinsic vessel contraction or relaxation interacting with systemic and local neurohormonal influences, meta bolic factors, other vasomotor mediators, etc. Every electrical activity is followed nor mally by a mechanical function (either contraction or relaxation), resulting in a pressure wave. These time delays permit the mechan ical functions to be in synchrony and generate efficient cardiac output and pressure. When the normal sequence of contraction and relaxation of the heart muscle is dis turbed by arrhythmia, cardiac function is inefficient or ineffective, as demonstrated on the various pressure waveforms associated with the arrhythmia. Following the A wave peak, the atrium relaxes and pressure falls, generating the X descent (point b). The period from aortic valve closure to mitral valve opening is call the isovolumetric relaxation period (inter val e­f). The V wave (point f, #4) peak is followed by a rapid fall when the mitral valve opens. Valve Hemodynamics To appreciate hemodynamic valve dysfunction, consider when cardiac pressure normally opens and closes the valves. Stenosis of these valves produces systolic pressure gradients and characteristic highvelocity heart murmurs. A mitral or tricuspid regurgitant valve that fails to close is characterized by a lowvelocity systolic murmur with a rumbling quality. When reviewing the cardiac hemodynamics, we can always refer to the Wiggers diagram for what the expected normal hemodynamic responses should be. Afterload, the impedance during ejection, is defined as the force per unit area acting upon myocardial fibers, a force resulting in wall stress, which is expressed by the Law of Laplace (Wall stress = Radius/2 x Thickness). Afterload is influenced by changes in ventricular volume and wall thickness, as well as aortic pressure or aortic impedance. Frank­Starling and Ventricular Waveforms Ventricular waveforms reflect both systolic and diastolic function and include the effects of chamber preload, contractility, and afterload. A brisk upstroke suggests reasonable function versus a sluggish or delayed pressure rise of depressed performance. In diastole, ventricular relaxation (dP/dt) is an active energyrequiring process and reflects intrinsic aspects of myocardial contractility as the ventricle actively "relaxes. Filling pressures in the ventricles reflect diastolic properties, influenced by intrinsic chamber factors. Systolic Function Systolic function reflects the ability of the ventricle to contract and generate output or stroke work, a function determined by its loading conditions, including both preload (determined by venous return and enddiastolic volume), afterload (related to aortic impedance and wall stress), and the contractile state (the force generated at any given enddiastolic volume). A secondary tidal wave follows, reflecting pri marily the returning pulse wave from the upper body (peripheral tone), which then smoothly falls to the dichrotic notch (incisura) which corresponds to aortic valve closure. In early diastole, a small positive wave may be seen, the dichrotic wave, most likely an effect of reflected pulse from the lower body. Pulse Amplification As the pulse wave travels distally through the arterial cir culation, the waveform may increase, a phenomenon termed peripheral amplification [2]. Amplification is characterized by a taller systolic peak, delayed dichrotic notch, lower enddiastolic pressure, and later pulse arrival. As the resistance of the branching arterial tree increases, the more of the pressure wave is reflected. This condition may explain the absence of pulsus parvus et tardus in very elderly aortic stenosis patients in whom the carotid pulse is preserved and reflects an exaggerated peripheral amplification from noncompliant vessels). The pressure wave reflection arises from the junction of conduit and low resistance arteries with highresistance arteries. Given that there are firmer junctions in the lower versus upper body, most reflection returning from the periphery comes from the lower body up into the proximal thoracic aorta. This reflected wave injects stroke volume, giving rise to the peak systolic pressure in the contour of the tidal wave. In older patients with nondistensible vasculature, the augmented reflected wave results in higher peak systolic pressure for any given stroke volume. Aortic diastolic pressure reflects the aggregate resist ance of the systemic arterial tree back upon the aortic valve. In contrast, the soft vasoplegic (dilated or relaxed) vessels of a septic patient will offer little resist ance, and the diastolic pressure will be lower. A regurgi tant aortic valve will also cause this pressure to be lower than normal, because the pressure wave travels all the way through to the ventricle manifested as the regurgitant jet. Pulse pressure is the difference between peak systolic and enddiastolic aortic pressures. A widened pulse pres sure suggests aortic regurgitation, because in diastole the arterial pressure drops to fill the left ventricle though the regurgitating aortic valve, and at the same time forward runoff is great, since peripheral resistance is also reduced. In contrast, a narrow pulse pressure may occur in condi tions such as cardiac tamponade, or any other lowoutput state. Diastole is not a passive process and is fundamentally influenced by various active factors. Diastole can be considered in four phases: isovo lumic relaxation, early filling, diastasis, and atrial contrac tion. Finally, active atrial contrac tion contributes the booster pump function, which deliv ers additional ventricular preload. These diastolic patterns are best illustrated not by invasive catheter interrogation, but rather by Doppler echocardiography under physio logic conditions. Functional preload is the amount of blood actually dis tending the cardiac chamber. This volume is reflected in filling pressure according to chamber compliance, the rela tionship between diastolic pressure and volume in any ana tomic chamber (ventricle, atrium, pericardium, cranium, etc. Cardiac chamber diastolic pressure is determined by the volume of blood in the chamber and its distensibility (compliance). Diastolic dysfunction is defined as a functional abnormality of diastolic relaxation, filling, or distensibility, in which filling is limited by abnormal chamber stiffness (hypertrophy, ischemia, fibrosis, infil tration, extrinsic pericardial resistance). Diastolic dysfunction may occur in association with chamber dilation and related systolic dysfunction. The compliant and contractile ventricle can accommodate a dramatically increased preload. However, diastolic pressure gener ated by any given degree of filling (true preload) is a function of the compliance of the chamber, and therefore filling pressure reasonably reflects preload only if cham ber compliance is normal. Thus, impaired compliance attributable to intrinsic factors (hypertrophy, infiltration or ischemia, or primary pressure and volume overload) or extrinsic constraint (pericardial disease or ventricular interactions) distorts the relationship between filling pressure and true preload. Conversely, chronic volume overload lesion such as aortic regurgitation may result in dramatically increased chamber volumes, but in those who are well compensated, intracardiac pressures are relatively normal as the chamber and pericardium dilate and become more compliant. The atrial waveforms are constituted by two positive waves (A and V peaks) and two collapsing waves (X and Y descents). The strength of atrial contraction is reflected in the rapidity of the A wave upstroke and peak amplitude. The X descent follows the A wave and is generated by two events: the initial decline in pressure reflecting active atrial relaxation, with a latter descent component reflect ing pericardial emptying during ventricular systole (also called systolic intrapericardial depressurization, a condi tion that is exaggerated when pericardial space is com promised). During ventricular systole, venous return results in atrial filling and pressure which peak with the V wave, whose height reflects the atrial pressure­volume com pliance characteristics. The subsequent diastolic Y descent represents atrial emptying and depressurization. Venous Circulations and Respiratory Oscillations Venous return to both atria is inversely proportional to the instantaneous atrial pressure, which is itself depend ent on compliance. The upstroke and amplitude of the A wave reflect atrial contraction and the initial portion of the extra set reflects atrial relaxation, with the latter portion due to systolic intrapericardial pressurization. From the downslope of the latter portion of the extra set to the height of the V wave represents the peak period of atrial venous return filling (or regurgitant filling if the atrio ventricular valve is incompetent), and therefore is a reflection of atrial compliance. Under physiologic conditions, respiratory oscillations exert complex effects on cardiac filling and dynamics since the respiratory effects on the right and the left heart are disparate, owing to differences in the venous return systems and the intrapleural space. The left heart and its tributary pulmonary veins are entirely within the intrathoracic space. In contrast, although both right heart chambers are intrathoracic, the tributary systemic venous system is extrapleural. In contrast, the left heart and its tributary pulmonary veins are entirely intrathoracic. Therefore, since pleural pressure changes are evenly distributed to the left heart and pulmonary veins, the pressure gradient from the pulmonary veins to the left ventricle shows minimal change with respiration. However, leftheart filling, stroke volume, and aortic systolic pressure normally decrease with inspiration (up to 10­12 mm Hg). The mechanisms responsible for this normal inspiratory oscillation in aortic pressure include variable ventricular volumes as each ventricle competes for its part of the entire cardiac volume constrained by the pericardium. This physiologic respiratory blood pressure oscillation phenomenon has somewhat confus ingly been termed paradoxical pulse, but is normal when <10­12 mm Hg. Kussmaul in 1898, describing the find ings of cardiac tamponade in a patient who was tachy cardic by auscultation but manifested "paradoxical" phasic dropout of radial pulse on palpation. Paradoxical pulse >12­15 mm Hg is abnormal and may reflect cardiac tamponade and other conditions of enhanced ventricu lar interaction with intact inspiratory venous return. Hemodynamics and Exercise/Stress Cardiac output increases to meet peripheral demands during exercise or metabolic stress. The increased heart rate is associated with enhanced contractility (the systolic "force­frequency relationship"). During exercise, venous return is enhanced by the pump ing action of skeletal muscle, venous valves, inspiratory suction induced by enhanced respiratory effort which augments rightheart filling, and ventricular suction during diastole. Ventricular Interactions the right and left hearts are connected "in series" across the lungs. The right heart is designed to pump blood through the lungs to deliver oxygenated preload to the left heart. Precapillary pulmonary hypertension reflects primary abnormalities of the pulmonary arterial 7 bed resulting from thromboembolic disease, primary pulmonary hypertension, or occasionally extrinsic mass obstruction of the major pulmonary arteries from medi astinal tumors. Primary intrapulmonary processes include the broad range of primary obstructive or restric tive lung diseases. Biventricular diastolic dysfunc tion contributes to hemodynamic compromise in 25% of cases overall. The normal pericardium more tightly constrains the ventricles and therefore enhances such interactions. Even in the absence of the pericardium, pressure or volume overload of one ventricle influences the compliance and filling of the contralateral ventricle. The pericardium envelopes the cardiac chambers and under physiological conditions exerts mechanical effects that enhance normal ventricular interactions, balancing left and right cardiac outputs. Because the pericardium is noncompliant, con ditions that cause intrapericardial crowding. This is the case in any patient with significant pulmonary hypertension, regard less of the cause. Backward Heart Failure Elevated pulmonary capillary pressure leads to elevated pulmonary vascular resistance and ultimately pulmo nary congestion. Fundamentals of RightHeart Hemodynamics Hemodynamics of Abnormal Cardiac Rhythms One of the most common pitfalls in the interpretation of hemodynamic data is the failure to appreciate abnormal ities in cardiac rhythms, which often account for the alteration and, at times, misinterpretation of pressure waveforms [8, 9]. Let us examine the rightheart hemo dynamics in a patient undergoing evaluation for short ness of breath. During pac ing, the pulmonary artery pressure has a larger respiratory variation and is higher than pressures obtained during normal sinus rhythm. How does one explain the large pointed waveforms at the left side in contrast to the smaller, broader waveforms demon strated at the right Compare the effects on the cardiac rhythm of the generation of right ventricular pressure. As the atrial time delay permits normal sinus mechanisms to intervene, the waveform changes into a sinustype rhythm with a larger A wave and a small V wave. Note the decrease in mean right atrial pressure from 10­12 mm Hg to < 8 mm Hg when sinus rhythm is in play. The rhythm changes explain the wide variations in right atrial and ventricular pressure waveforms, and should be important functional clues in the evaluation of hemodynamics for such individuals. Examine the pressure waves and consider the following: What is the etiology of the large, spiked waves (C)

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