abstract：:Frequency analysis with fast Fourier transform and time domain analysis after signal averaging of the electrocardiogram (ECG) have given contradictory results in patients with sustained ventricular tachycardia after myocardial infarction. Therefore, the same orthogonal ECGs were analyzed in the frequency domain (Black...

journal_title：Journal of the American College of Cardiology

authors： Haberl R,Jilge G,Pulter R,Steinbeck G

更新日期：1988-07-01 00:00:00

abstract：:The incidence of left atrial spontaneous echo contrast was evaluated in 52 patients with isolated or predominant mitral valve stenosis (Group 1) and 70 other patients who had undergone mitral valve replacement (Group 2). All patients were studied by conventional transthoracic and transesophageal two-dimensional echoca...

journal_title：Journal of the American College of Cardiology

authors： Daniel WG,Nellessen U,Schröder E,Nonnast-Daniel B,Bednarski P,Nikutta P,Lichtlen PR

更新日期：1988-06-01 00:00:00

abstract：:The American Board of Internal Medicine has called on directors of cardiology training programs to establish systems to evaluate, document and substantiate those components of overall clinical competence considered essential for certification in the subspecialty. Many of these can be assessed only by repeated direct o...

journal_title：Journal of the American College of Cardiology

authors： Popp RL,Parmley WW,Benson JA Jr

更新日期：1988-06-01 00:00:00

abstract：:This study examined the effect of repeating the delivery of a programmed extrastimulus that previously failed to induce ventricular tachycardia, without the usual practice of concurrently altering other stimulation variables such as pacing site or basic cycle length. The impact of such repetition on both sensitivity a...

journal_title：Journal of the American College of Cardiology

authors： Cooper MJ,Hunt LJ,Richards DA,Denniss AR,Uther JB,Ross DL

更新日期：1988-06-01 00:00:00

abstract：:To determine the effects of dopamine-1 agonist therapy in severe hypertension, blood pressure, heart rate, catecholamines and left ventricular function were studied in 18 patients (10 with renal disease) with diastolic blood pressure greater than 120 mm Hg (range 124 to 160) after intravenous fenoldopam therapy. Const...

journal_title：Journal of the American College of Cardiology

authors： White WB,Radford MJ,Gonzalez FM,Weed SG,McCabe EJ,Katz AM

更新日期：1988-05-01 00:00:00

abstract：:To examine whether cardiopulmonary receptors participate in the reflex control of coronary vascular resistance, systemic and coronary hemodynamics were assessed before and during -10 mm Hg lower body negative pressure in eight normal subjects and eight hypertensive patients with left ventricular hypertrophy. In both s...

journal_title：Journal of the American College of Cardiology

authors： Trimarco B,Vigorito C,Cuocolo A,Ricciardelli B,De Luca N,Volpe M,Lembo G,Condorelli M

更新日期：1988-05-01 00:00:00

abstract：:Although successful operative treatment of atrial focal tachycardia has been reported in children, there are only isolated reports of surgical treatment of this arrhythmia in adults. In this case series of eight patients (aged 10 to 53 years) with drug-resistant right atrial focal tachycardia, results of electrophysio...

journal_title：Journal of the American College of Cardiology

authors： Seals AA,Lawrie GM,Magro S,Lin HT,Pacifico A,Roberts R,Wyndham CR

更新日期：1988-05-01 00:00:00

abstract：:Cardiac tamponade has been associated with an abnormally increased respiratory variation in transvalvular blood flow velocities. To determine whether this finding is consistently present in cardiac tamponade, seven patients were studied prospectively with Doppler echocardiography before and after pericardiocentesis an...

journal_title：Journal of the American College of Cardiology

authors： Appleton CP,Hatle LK,Popp RL

更新日期：1988-05-01 00:00:00

abstract：:Doppler echocardiographic determination of the pulmonary to systemic blood flow (Qp/Qs) ratio requires calculation of pulmonary artery and aortic luminal areas and integrals of the Doppler systolic velocity curves. To simplify the Doppler calculation of the Qp/Qs ratio, the square of the ratio of pulmonary to aortic l...

journal_title：Journal of the American College of Cardiology

authors： Cloez JL,Schmidt KG,Birk E,Silverman NH

更新日期：1988-04-01 00:00:00

abstract：:Thirteen patients with tuberculous pericarditis (12 men and 1 woman aged 13 to 70 years [mean 41]) were identified in a group of 294 patients consecutively admitted for primary acute pericardial disease. The diagnosis was made by the following studies: sputum culture (n = 4), culture of pericardial fluid obtained by p...

journal_title：Journal of the American College of Cardiology

authors： Sagristà-Sauleda J,Permanyer-Miralda G,Soler-Soler J

更新日期：1988-04-01 00:00:00

abstract：:The relation between coronary patency after infusion of recombinant tissue-type plasminogen activator (rt-PA) and clinical and laboratory findings was assessed in patients with acute myocardial infarction. This study focused primarily on information available early in the hospitalization phase. Data were available for...

journal_title：Journal of the American College of Cardiology

authors： Brower RW,Arnold AE,Lubsen J,Verstraete M

更新日期：1988-04-01 00:00:00

abstract：:The Western Washington Intravenous Streptokinase in Acute Myocardial Infarction Trial randomized 368 patients with symptoms and signs of acute myocardial infarction of less than 6 h duration to either conventional care or 1.5 million units of intravenous streptokinase. The mean time to randomization was 209 min and 52...

journal_title：Journal of the American College of Cardiology

authors： Ritchie JL,Cerqueira M,Maynard C,Davis K,Kennedy JW

更新日期：1988-04-01 00:00:00

abstract：:Pulsed Doppler echocardiography has been used previously to demonstrate marked changes in transvalvular blood flow velocities during cardiac tamponade in laboratory animals and a small number of patients. To further assess the respiratory changes in transvalvular blood flow during tamponade, pulsed Doppler tracings of...

journal_title：Journal of the American College of Cardiology

authors： Leeman DE,Levine MJ,Come PC

更新日期：1988-03-01 00:00:00

abstract：:Five children, aged 0.2 to 6.7 years, with pulmonary artery origin of the left coronary artery proved by angiography underwent echocardiographic examination from 1985 through 1986. Prospective identification of this condition was achieved by two-dimensional echocardiography alone in two patients. Using a parasagittal ...

journal_title：Journal of the American College of Cardiology

authors： Schmidt KG,Cooper MJ,Silverman NH,Stanger P

更新日期：1988-02-01 00:00:00

abstract：:Previous studies have suggested that right ventricular systolic pressure can be predicted from noninvasive estimates of the interval between pulmonary valve closure and tricuspid valve opening. To determine the basis for this relation, phonocardiograms and high fidelity right atrial and ventricular pressures were reco...

journal_title：Journal of the American College of Cardiology

authors： Triffon D,Groves BM,Reeves JT,Ditchey RV

更新日期：1988-02-01 00:00:00

abstract：:Two hundred ninety patients with acute myocardial infarction were treated according to random assignment with an intravenous infusion of either 80 mg of recombinant tissue plasminogen activator (rt-PA) over 3 h or 1.5 million units of streptokinase over 1 h. Patients received an intravenous bolus of heparin (5,000 U [...

journal_title：Journal of the American College of Cardiology

authors： Rao AK,Pratt C,Berke A,Jaffe A,Ockene I,Schreiber TL,Bell WR,Knatterud G,Robertson TL,Terrin ML

更新日期：1988-01-01 00:00:00

abstract：:Rate-responsive cardiac pacing requires a sensitive physiologic variable that is closely correlated with the heart rate-oxygen uptake relation, particularly in patients with heart failure whose cardiac output response to exercise is more dependent on heart rate. Accordingly, the heart rate response to upright exercise...

journal_title：Journal of the American College of Cardiology

authors： McElroy PA,Janicki JS,Weber KT

更新日期：1988-01-01 00:00:00

abstract：:In adults with hypertrophic cardiomyopathy, the annual mortality rate from sudden death is 2 to 3%, and the finding of nonsustained ventricular tachycardia during electrocardiographic (ECG) monitoring provides a marker of the patient who is at increased risk. In the young, the annual mortality rate from sudden death i...

journal_title：Journal of the American College of Cardiology

authors： McKenna WJ,Franklin RC,Nihoyannopoulos P,Robinson KC,Deanfield JE

更新日期：1988-01-01 00:00:00

abstract：:In 14 patients with severe congestive heart failure, left ventricular pressure (measured by tip manometer) and derived variables were measured before and every 10 minutes after administration of oral milrinone (10 mg) for 50 minutes along with measurements of coronary sinus blood flow and drug plasma levels. Arterial ...

journal_title：Journal of the American College of Cardiology

authors： Piscione F,Jaski BE,Wenting GJ,Serruys PW

更新日期：1987-12-01 00:00:00

abstract：:Patients with portal hypertension of varying etiology may develop pulmonary artery hypertension. In the present autopsy study, pulmonary and hepatic tissue was studied in 12 patients in whom pulmonary and portal hypertension coexisted. Plexogenic pulmonary arteriopathy was present in 10 patients, 7 of whom had coexist...

journal_title：Journal of the American College of Cardiology

authors： Edwards BS,Weir EK,Edwards WD,Ludwig J,Dykoski RK,Edwards JE

更新日期：1987-12-01 00:00:00

abstract：:Because of its enhanced activation of plasminogen in association with fibrin compared with free plasminogen, tissue-type plasminogen activator (t-PA) evoked excitement as a potentially useful pharmacologic activator of the fibrinolytic system. Initial studies in experimental animals and patients demonstrated that it i...

journal_title：Journal of the American College of Cardiology

authors： Sobel BE

更新日期：1987-11-01 00:00:00

abstract：:This is a review of the important randomized trials of intracoronary and intravenous streptokinase therapy for treatment of acute myocardial infarction. Trials carried out before 1980 failed to recognize the relations between early coronary reperfusion and myocardial salvage and therefore have not been included in thi...

journal_title：Journal of the American College of Cardiology

authors： Kennedy JW

更新日期：1987-11-01 00:00:00

abstract：:The Bio 14.6 Syrian hamster provides a good model for experimental study of cardiomyopathy. Cardiac receptor binding sites (alpha-1-, beta- and calcium antagonists) were studied in early (21 days old) and late (70 days old) stages of cardiomyopathy. The effects of verapamil on histologic features and free radicals in ...

journal_title：Journal of the American College of Cardiology

authors： Kobayashi A,Yamashita T,Kaneko M,Nishiyama T,Hayashi H,Yamazaki N

更新日期：1987-11-01 00:00:00

abstract：:The onset and resolution of electrical and functional measures of regional myocardial ischemia were examined in nine conscious dogs during control exercise and exercise after beta-receptor blockade. The dogs had been instrumented with an ameroid constrictor and were studied when no regional dysfunction was evident at ...

journal_title：Journal of the American College of Cardiology

authors： Grover-McKay M,Matsuzaki M,Ross J Jr

更新日期：1987-11-01 00:00:00

abstract：:Acute myocardial ischemia is known to cause impairment of both left ventricular systolic and diastolic function. To further investigate these changes as well as their relation to common clinical variables (electrocardiographic [ECG] changes and chest pain), 32 patients were evaluated with Doppler echocardiography duri...

journal_title：Journal of the American College of Cardiology

authors： Labovitz AJ,Lewen MK,Kern M,Vandormael M,Deligonal U,Kennedy HL

更新日期：1987-10-01 00:00:00

abstract：:The mechanism of the antianginal actions of nilvadipine was investigated in 11 patients with effort angina pectoris. Hemodynamic data were obtained by angina-limited supine multistage bicycle ergometer exercise testing before and after a single 6 mg dose of nilvadipine. Compared with chest pain during control exercise...

journal_title：Journal of the American College of Cardiology

authors： Yokota M,Koide M,Miyahara T,Kamihara S,Tsunekawa A,Noda S,Sotobata I

更新日期：1987-10-01 00:00:00

abstract：:Recent trials have shown that recombinant tissue plasminogen activator (rt-PA) is an effective thrombolytic agent in patients with acute myocardial infarction. Because rt-PA converts plasminogen to plasmin, which is known to activate complement in vitro, we tested the hypothesis that rt-PA can induce in vivo activatio...

journal_title：Journal of the American College of Cardiology

authors： Bennett WR,Yawn DH,Migliore PJ,Young JB,Pratt CM,Raizner AE,Roberts R,Bolli R

更新日期：1987-09-01 00:00:00

abstract：:Thirty patients with stable exertional angina undergoing percutaneous transluminal coronary angioplasty of an isolated obstructive lesion of the proximal left anterior descending artery were prospectively evaluated to investigate the relation between angina induced by balloon inflation and the quantity and severity of...

journal_title：Journal of the American College of Cardiology

authors： Wohlgelernter D,Jaffe CC,Cabin HS,Yeatman LA Jr,Cleman M

更新日期：1987-09-01 00:00:00

abstract：:In 10 patients with moderate to severe hypertension, the hemodynamic effects of ergometric exercise and nicardipine, a dihydropyridine calcium channel antagonist, were characterized under basal conditions and after 1 week of therapy. The responses of plasma renin activity and catecholamines were also assessed. Nicardi...

journal_title：Journal of the American College of Cardiology

authors： Cody RJ,Kubo SH,Ryman KS,Shaknovich A,Laragh JH

更新日期：1987-09-01 00:00:00

abstract：:Exercise echocardiography is an emerging technique for the evaluation of patients with suspected coronary artery disease. In this study, rest and immediate postexercise echocardiograms were performed in 123 patients who were stratified on the basis of prior myocardial infarction and the number and location of coronary...

journal_title：Journal of the American College of Cardiology

authors： Armstrong WF,O'Donnell J,Ryan T,Feigenbaum H

更新日期：1987-09-01 00:00:00

abstract：:The efficacy of truncated exponential waveform shocks using a cardioverter-defibrillator catheter with and without a 13.9 cm2 subcutaneous thoracic patch electrode was examined in 10 pentobarbital-anesthetized dogs. The cardioverter-defibrillator catheter was positioned through the external jugular vein with the dista...

journal_title：Journal of the American College of Cardiology

authors： Wetherbee JN,Chapman PD,Klopfenstein HS,Bach SM Jr,Troup PJ

更新日期：1987-08-01 00:00:00

abstract：:Six patients with coexistent Mahaim and Kent accessory connections are described. Two had left nodoventricular Mahaim connections, the first reported cases demonstrating these findings. In neither were the left-sided Mahaim connections components of a tachycardia and their presence was incidental. In two of four with ...

journal_title：Journal of the American College of Cardiology

authors： Abbott JA,Scheinman MM,Morady F,Shen EN,Miller R,Ruder MA,Eldar M,Seger JJ,Davis JC,Griffin JC

更新日期：1987-08-01 00:00:00

abstract：:The relation of clinical and electrophysiologic variables to outcome was evaluated in 121 patients treated with amiodarone for sustained ventricular tachyarrhythmias. Electrophysiologic study was performed in all patients a mean of 14 days after beginning amiodarone therapy. Forty-six patients who were given oral amio...

journal_title：Journal of the American College of Cardiology

authors： Kadish AH,Buxton AE,Waxman HL,Flores B,Josephson ME,Marchlinski FE

更新日期：1987-07-01 00:00:00

abstract：:Sotalol is a beta-adrenergic blocking agent that prolongs the duration of the cardiac action potential in humans, without affecting the upstroke velocity of depolarization. The dextrorotatory isomer, d-sotalol, retains these class III effects, but has little beta-blocking activity in vitro. d-Sotalol has not been stud...

journal_title：Journal of the American College of Cardiology

authors： McComb JM,McGovern B,McGowan JB,Ruskin JN,Garan H

更新日期：1987-07-01 00:00:00

abstract：:Silent myocardial ischemia is common in unstable angina, but its prognostic significance is unknown. Fifty-two (42 with subsequent angiography) of 81 patients prospectively evaluated for unstable angina had ambulatory electrocardiographic (Holter) recordings analyzed by compact analog technique after they had received...

journal_title：Journal of the American College of Cardiology

authors： Nademanee K,Intarachot V,Josephson MA,Rieders D,Vaghaiwalla Mody F,Singh BN

更新日期：1987-07-01 00:00:00

abstract：:Anisoylated plasminogen streptokinase activator complex (APSAC) is a new thrombolytic agent that is of interest because of its ease of administration as an intravenous bolus injection. This report describes the first double-blind, placebo-controlled evaluation of intravenous APSAC for coronary recanalization in acute ...

journal_title：Journal of the American College of Cardiology

authors： Timmis AD,Griffin B,Crick JC,Sowton E

更新日期：1987-07-01 00:00:00

abstract：:In a previous study, a significant inverse relation was found between the luminal size of aortocoronary venous bypass grafts and the vascular resistance of the coronary region that was perfused by the bypass graft in late stages after bypass surgery. This observation suggested that changes in the graft-dependent vascu...

journal_title：Journal of the American College of Cardiology

authors： Herrmann G,Simon R,Amende I,Frank G,Borst HG,Lichtlen PR

更新日期：1987-07-01 00:00:00

abstract：:N-acetylprocainamide (NAPA) is said to have class III antiarrhythmic drug properties. The effects of NAPA (25 mg/kg intravenously) on sustained, stable, reentrant atrial flutter induced in 12 conscious dogs using a sterile pericarditis model were studied and compared with the effects of quinidine (5 mg/kg intravenousl...

journal_title：Journal of the American College of Cardiology

authors： Okumura K,Waldo AL

更新日期：1987-06-01 00:00:00

abstract：:The efficacy and safety of intravenous propafenone was studied in 10 patients with Wolff-Parkinson-White syndrome and in 2 patients with a concealed accessory pathway. During electrophysiologic study, the effect of propafenone on the effective refractory period of the accessory pathway was determined, as well as its e...

journal_title：Journal of the American College of Cardiology

authors： Ludmer PL,McGowan NE,Antman EM,Friedman PL

更新日期：1987-06-01 00:00:00

abstract：:A new, predominantly single chain preparation of recombinant tissue-type plasminogen activator was evaluated to determine coronary thrombolytic efficacy in 100 patients with acute myocardial infarction. At 3.6 +/- 1.2 hours (mean +/- SD) from symptom onset, patients received either intravenous tissue plasminogen activ...

journal_title：Journal of the American College of Cardiology

authors： Topol EJ,Morris DC,Smalling RW,Schumacher RR,Taylor CR,Nishikawa A,Liberman HA,Collen D,Tufte ME,Grossbard EB

更新日期：1987-06-01 00:00:00