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 recorded in 29 patients with a right ventricular systolic pressure ranging from 20 to 149 mm Hg. In 22 patients with normal right atrial pressure (less than or equal to 8 mm Hg), both the time interval and the magnitude of pressure decrease from pulmonary valve closure to tricuspid valve opening were linearly related to systolic pressure (r = 0.89 and 0.96, respectively). Early pulmonary valve closure (decreased "hang-out" time) contributed to the greater magnitude of isovolumic pressure decrease at high systolic pressures, but correction for hang-out time did not eliminate the relation between systolic pressure and the pulmonary valve closure-tricuspid valve opening interval (n = 10). When patients with documented right coronary artery disease were excluded, the time constant for isovolumic pressure decrease also increased as a function of systolic pressure (r = 0.67, p less than 0.01, n = 24), suggesting impaired relaxation at high systolic pressures. However, the mean rate of pressure decrease (mean negative dP/dt) still was greater in patients with a high pressure because of the exponential nature of the isovolumic pressure-time relation.(ABSTRACT TRUNCATED AT 250 WORDS)
journal_name
J Am Coll Cardioljournal_title
Journal of the American College of Cardiologyauthors
Triffon D,Groves BM,Reeves JT,Ditchey RVdoi
10.1016/0735-1097(88)90097-6subject
Has Abstractpub_date
1988-02-01 00:00:00pages
322-9issue
2eissn
0735-1097issn
1558-3597pii
0735-1097(88)90097-6journal_volume
11pub_type
杂志文章abstract:OBJECTIVES:This study was designed to determine whether imaging myocardial edema would identify acute myocardial ischemia before irreversible injury takes place. BACKGROUND:Early identification of acute myocardial ischemia is a diagnostic challenge. METHODS:We studied 15 dogs with serial T(2)-weighted and cine imagin...
journal_title:Journal of the American College of Cardiology
pub_type: 杂志文章
doi:10.1016/j.jacc.2008.10.065
更新日期:2009-04-07 00:00:00
abstract::The American College of Cardiology Foundation (ACCF) and the American Society of Echocardiography (ASE) together with key specialty and subspecialty societies, conducted an appropriateness review for stress echocardiography. The review assessed the risks and benefits of stress echocardiography for several indications ...
journal_title:Journal of the American College of Cardiology
pub_type: 杂志文章,实务指引
doi:10.1016/j.jacc.2007.12.005
更新日期:2008-03-18 00:00:00
abstract:OBJECTIVES:We sought to examine the short-term and longer term (6-week) effects of continuous positive airway pressure (CPAP) on myocardial energetics. BACKGROUND:Obstructive sleep apnea (OSA) and heart failure (HF) are both states of increased afterload and metabolic demand. Treatment with CPAP may initially reduce s...
journal_title:Journal of the American College of Cardiology
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doi:10.1016/j.jacc.2006.08.059
更新日期:2007-01-30 00:00:00
abstract:OBJECTIVES:The aim of this study was to evaluate low-level exercise echocardiography (LLEE) in detecting contractile reserve and predicting functional improvement of akinetic myocardium early after acute myocardial infarction (AMI). BACKGROUND:Experimental and clinical studies have shown that low-dose dobutamine enhan...
journal_title:Journal of the American College of Cardiology
pub_type: 临床试验,杂志文章,随机对照试验
doi:10.1016/s0735-1097(99)00340-x
更新日期:1999-10-01 00:00:00
abstract:OBJECTIVES:We hypothesized that an amlodipine-based regimen would have more favorable effects on left ventricular (LV) diastolic function. BACKGROUND:Different antihypertensive therapies may vary in their effect on LV diastolic function. METHODS:The HACVD (Hypertension Associated Cardiovascular Disease) substudy of A...
journal_title:Journal of the American College of Cardiology
pub_type: 杂志文章
doi:10.1016/j.jacc.2009.11.084
更新日期:2010-04-27 00:00:00
abstract::Twelve cardiac electrophysiology centers conducted an open label prospective trial of bethanidine sulfate, an oral bretylium analog, for the prevention of ventricular tachyarrhythmias during programmed electrical stimulation. The study group included 56 patients (44 men, 12 women; mean age 60 years; 55 with structural...
journal_title:Journal of the American College of Cardiology
pub_type: 临床试验,杂志文章
doi:10.1016/s0735-1097(85)80106-6
更新日期:1985-09-01 00:00:00
abstract::The new Adult Treatment Panel guidelines will be published in 2011. This paper suggests the consideration of major changes in the existing management guidelines for low-density lipoprotein cholesterol management based on 2 fundamental principles: return the low-density lipoprotein cholesterol level to the normal range...
journal_title:Journal of the American College of Cardiology
pub_type: 杂志文章
doi:10.1016/j.jacc.2009.11.090
更新日期:2010-08-17 00:00:00
abstract::An echocardiographic Doppler study in a patient with pulsus paradoxus of respiratory origin demonstrated a large inspiratory increase of tricuspid flow velocity and a corresponding decrease of mitral flow velocity. This "flow paradoxus" is therefore not specific for cardiac tamponade, and provides evidence that decrea...
journal_title:Journal of the American College of Cardiology
pub_type: 杂志文章
doi:10.1016/s0735-1097(86)80205-4
更新日期:1986-09-01 00:00:00
abstract:OBJECTIVES:This study addresses the efficacy of directional atherectomy in the subclavian artery for the relief of angina in patients with the coronary-subclavian steal syndrome. In addition, we review the histologic findings from the atherectomy specimens. BACKGROUND:The coronary-subclavian steal syndrome may occur a...
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pub_type: 杂志文章
doi:10.1016/0735-1097(93)90369-c
更新日期:1993-06-01 00:00:00
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journal_title:Journal of the American College of Cardiology
pub_type: 杂志文章
doi:10.1016/0735-1097(90)90290-6
更新日期:1990-03-15 00:00:00
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journal_title:Journal of the American College of Cardiology
pub_type: 临床试验,杂志文章,多中心研究,随机对照试验
doi:10.1016/s0735-1097(99)00271-5
更新日期:1999-09-01 00:00:00
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pub_type: 杂志文章
doi:10.1016/s0735-1097(00)00960-8
更新日期:2000-11-15 00:00:00
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journal_title:Journal of the American College of Cardiology
pub_type: 临床试验,杂志文章,随机对照试验
doi:10.1016/0735-1097(94)00514-q
更新日期:1995-04-01 00:00:00
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pub_type: 杂志文章
doi:10.1016/s0735-1097(02)02595-0
更新日期:2002-12-18 00:00:00
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journal_title:Journal of the American College of Cardiology
pub_type: 杂志文章
doi:10.1016/s0735-1097(02)01956-3
更新日期:2002-07-17 00:00:00
abstract:OBJECTIVES:This study sought to establish and maintain patency of the ductus arteriosus by a new method of transvascular formalin infiltration of the ductus arteriosus wall. BACKGROUND:Maintaining patency of the ductus arteriosus postnatally is necessary with many forms of congenital heart disease to ensure survival u...
journal_title:Journal of the American College of Cardiology
pub_type: 杂志文章
doi:10.1016/0735-1097(96)00128-3
更新日期:1996-07-01 00:00:00
abstract::To assess the potential of in vivo nuclear magnetic resonance imaging for the detection of reperfused myocardium, in vivo T2-weighted spin echo images were obtained of dogs at 0.15 tesla. Imaging was done during 3 hours of coronary occlusion (group I), and during 3 hours of coronary occlusion followed by 1 hour of rep...
journal_title:Journal of the American College of Cardiology
pub_type: 杂志文章
doi:10.1016/s0735-1097(87)80091-8
更新日期:1987-01-01 00:00:00
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journal_title:Journal of the American College of Cardiology
pub_type: 杂志文章
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更新日期:1987-06-01 00:00:00
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更新日期:1993-11-15 00:00:00
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更新日期:1993-01-01 00:00:00
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pub_type: 临床试验,杂志文章
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更新日期:2010-06-01 00:00:00
abstract::Forty years ago therapy for congestive heart failure was limited largely to the mercurial diuretics and a variety of cardiac glycoside preparations; these were often ineffective, and the common practice of "pushing" digitalis caused serious, sometimes lethal side effects. Today, a more complete understanding of the re...
journal_title:Journal of the American College of Cardiology
pub_type: 杂志文章,评审
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更新日期:1989-03-01 00:00:00
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journal_title:Journal of the American College of Cardiology
pub_type: 杂志文章
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更新日期:2000-03-15 00:00:00
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journal_title:Journal of the American College of Cardiology
pub_type: 杂志文章
doi:10.1016/s0735-1097(98)90072-9
更新日期:1988-05-01 00:00:00
abstract:BACKGROUND:Previous studies raised safety concerns on the association between fluoroquinolone treatment and serious collagen disorders, aortic aneurysm and dissection (AA/AD). OBJECTIVES:This study sought to evaluate this association via a case-crossover analysis in a large national administrative database. METHODS:A...
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pub_type: 杂志文章
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更新日期:2018-09-18 00:00:00
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pub_type: 杂志文章
doi:10.1016/j.jacc.2005.11.077
更新日期:2006-04-04 00:00:00
abstract:OBJECTIVES:The purpose of this study was to test the hypothesis that the longer duration of ventricular action potentials in hypertrophied hearts predisposes to the development of early after-depolarizations and triggered ventricular tachyarrhythmias. BACKGROUND:For unknown reasons, the incidence of sudden death is gr...
journal_title:Journal of the American College of Cardiology
pub_type: 杂志文章
doi:10.1016/0735-1097(92)90453-t
更新日期:1992-12-01 00:00:00
abstract::Sixteen patients with double-outlet right ventricle, aged 1 week to 29 years (median 5 months), were studied with a 1.5 tesla nuclear magnetic resonance (NMR) imaging scanner. Two-dimensional echocardiography was performed in all patients. Thirteen patients underwent angiography, including nine who underwent subsequen...
journal_title:Journal of the American College of Cardiology
pub_type: 杂志文章
doi:10.1016/s0735-1097(10)80237-2
更新日期:1991-07-01 00:00:00
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journal_title:Journal of the American College of Cardiology
pub_type: 杂志文章
doi:10.1016/0735-1097(94)90179-1
更新日期:1994-12-01 00:00:00
abstract:OBJECTIVES:The purpose of this study was to describe our preliminary experience using catheter-based intracardiac echocardiography as an adjunct to biplane fluoroscopy for guiding radiofrequency catheter ablation of atrial arrhythmias in the right side of the heart. BACKGROUND:Catheter ablation requires precise positi...
journal_title:Journal of the American College of Cardiology
pub_type: 临床试验,杂志文章
doi:10.1016/0735-1097(94)90119-8
更新日期:1994-11-01 00:00:00