Abstract:
:The manner in which concealed anterograde impulse penetration may affect retrograde atrioventricular nodal conduction was studied systematically in 12 patients with intact ventriculoatrial (VA) conduction. After the last beat of a basic atrial drive (A1), an extrastimulus (A2) was introduced 20 msec inside the effective refractory period of the atrioventricular node. A ventricular extrastimulus (Vp) was then introduced at a progressively shorter A1Vp coupling interval both in the presence (method I) and absence (method II) of A2. In two patients, Vp was never conducted retrogradely to the atria with method I despite the presence of VA conduction during method II. In the remaining 10 patients, the VpAp interval was longer with method I vs method II; moreover, retrograde block of Vp ultimately occurred at a mean A2Vp coupling interval of 359 +/- 153 msec (range 190 to 540 msec) during method I despite the persistence of VA conduction during method II at comparable A1Vp coupling intervals. Before onset of retrograde block in method I, the VpAp curve took one of the following three forms: (1) crescendo, a progressively increasing VpAp interval; (2) flat, a constant VpAp interval, (four cases); or (3) discontinuous, a marked jump in the VpAp interval before the onset of retrograde block (two cases). Our findings may serve to elucidate some poorly understood electrophysiologic phenomena.
journal_name
Am Heart Jjournal_title
American heart journalauthors
Lehmann MH,Mahmud R,Denker ST,Tchou PJ,Dongas J,Akhtar Mdoi
10.1016/0002-8703(87)90539-4subject
Has Abstractpub_date
1987-12-01 00:00:00pages
1374-83issue
6eissn
0002-8703issn
1097-6744pii
0002-8703(87)90539-4journal_volume
114pub_type
杂志文章abstract:BACKGROUND:We review our 10-year experience of mitral valve (MV) repair in comparison with MV replacement in the elderly for floppy mitral valves/mitral valve prolapse (FMV/MVP). The use of MV repair for this entity has not been fully utilized by surgeons. METHODS:Two hundred ninety-two consecutive patients aged > or ...
journal_title:American heart journal
pub_type: 杂志文章
doi:10.1016/j.ahj.2005.07.003
更新日期:2006-06-01 00:00:00
abstract:BACKGROUND:Assessment of left ventricular (LV) thrombosis risk after acute myocardial infarction (AMI) is important because of potential embolic sequelae that are reduced by oral anticoagulant agents. The goal of this study was to investigate whether early assessment of LV systolic and diastolic performance with pulsed...
journal_title:American heart journal
pub_type: 临床试验,杂志文章
doi:10.1016/j.ahj.2004.05.025
更新日期:2004-12-01 00:00:00
abstract:BACKGROUND:Previous studies have suggested that thrombolysis is used less often in blacks than in whites. However, whether the greater prevalence of contraindications or less specific electrocardiographic manifestations of myocardial infarction (MI) account for this difference is unclear. METHODS AND RESULTS:We studie...
journal_title:American heart journal
pub_type: 杂志文章
doi:10.1067/mhj.2000.107173
更新日期:2000-08-01 00:00:00
abstract:BACKGROUND:Heart failure (HF) remains a major public health issue. Data on long-term trends in the incidence of HF and survival after its onset are limited. METHODS:A prospective cohort study conducted between 1985 and 2004 in 21,906 participants of the Physicians' Health Study I who were alive and free of HF on Janua...
journal_title:American heart journal
pub_type: 杂志文章
doi:10.1016/j.ahj.2007.07.004
更新日期:2007-11-01 00:00:00
abstract:BACKGROUND:Prior studies have reported race and sex differences in cardiac catheterization use after acute myocardial infarction (AMI). It is unclear whether race or sex differences in procedure refusal may contribute to this difference. We sought to determine whether cardiac catheterization refusal rates differ by pat...
journal_title:American heart journal
pub_type: 杂志文章
doi:10.1067/mhj.2002.126122
更新日期:2002-12-01 00:00:00
abstract::Clinical and experimental evidence suggest that sympathoadrenal activation contributes to mortality in patients with ischemic heart disease. To determine the level of sympathoadrenal activation in the very early phase of acute myocardial infarction (AMI) and to determine if location of infarction (anterior versus infe...
journal_title:American heart journal
pub_type: 杂志文章
doi:10.1016/0002-8703(81)90408-7
更新日期:1981-07-01 00:00:00
abstract:BACKGROUND:The few available studies of the Centers for Medicare and Medicaid Services Hospital Inpatient Quality Reporting (IQR) care process indicators have not linked receipt of recommended care processes in heart failure (HF) with lower mortality. Because the Veterans Health Administration (VHA) also tracks hospita...
journal_title:American heart journal
pub_type: 杂志文章
doi:10.1016/j.ahj.2014.06.024
更新日期:2014-11-01 00:00:00
abstract:BACKGROUND:Chronic total occlusion (CTO) recanalizations remain extremely challenging procedures. With improvements in technology and techniques, success rates for recanalization of CTO continue to improve. However, the clinical benefits of this practice remain unclear. The aim of the study was to determine the effecti...
journal_title:American heart journal
pub_type: 杂志文章,meta分析,评审
doi:10.1016/j.ahj.2010.04.015
更新日期:2010-07-01 00:00:00
abstract::Intracoronary streptokinase (SK) is being used to treat acute myocardial infarction. Complications including atrioventricular (AV) block and both supraventricular and ventricular arrhythmias have been described. Selective cannulation of the nutrient arteries of the sinus node and AV node in the pentobarbital-anestheti...
journal_title:American heart journal
pub_type: 杂志文章
doi:10.1016/0002-8703(84)90825-1
更新日期:1984-05-01 00:00:00
abstract:BACKGROUND:Although hospital admissions during weekends have been associated with worse quality of care and worse outcomes in some but not all medical conditions, the impact of weekend versus weekday admission and discharge for heart failure (HF) has not been well studied. This study investigates the association of (1)...
journal_title:American heart journal
pub_type: 杂志文章
doi:10.1016/j.ahj.2009.06.025
更新日期:2009-09-01 00:00:00
abstract::Acute myocardial infarction (MI) patients remain at high risk for recurrent events. Cholesterol efflux, mediated by apolipoprotein A-I, removes excess cholesterol from atherosclerotic plaque and transports it to the liver for excretion. Impaired cholesterol efflux is associated with higher cardiovascular (CV) event ra...
journal_title:American heart journal
pub_type: 杂志文章,多中心研究,随机对照试验
doi:10.1016/j.ahj.2020.10.052
更新日期:2021-01-01 00:00:00
abstract::Doxazosin, a selective alpha 1-inhibitor, was assessed for antihypertensive efficacy, effect on lipid parameters, and safety profile in 21 hypertensive patients with noninsulin-dependent diabetes mellitus. The study involved a 2- to 4-week baseline period, a 10-week period in which patients received doxazosin, 1 to 8 ...
journal_title:American heart journal
pub_type: 杂志文章
doi:10.1016/0002-8703(88)90229-3
更新日期:1988-12-01 00:00:00
abstract::Salient clinical, hemodynamic, angiocardiographic, and pathologic findings are presented in 100 patients with truncus arteriosus communis, 79 of whom were studied at autopsy. In this study of typical truncus, all had a ventricular septal defect (type A). Truncus with a partially formed aorticopulmonary septum (type A1...
journal_title:American heart journal
pub_type: 杂志文章
doi:10.1016/s0002-8703(76)80400-0
更新日期:1976-07-01 00:00:00
abstract:BACKGROUND:Angiotensin-converting enzyme inhibitors and angiotensin receptor blockers effectively reduce blood pressure in patients with renovascular disease (RVD); yet, randomized cardiovascular prevention trials of these drugs typically exclude individuals with this condition. PATIENTS AND METHODS:We studied the ass...
journal_title:American heart journal
pub_type: 杂志文章
doi:10.1016/j.ahj.2008.05.013
更新日期:2008-09-01 00:00:00
abstract:OBJECTIVE:This study was planned to evaluate the outcome of patients ≥80 years old undergoing isolated conventional aortic valve replacement (AVR). METHODS:Systematic review of the literature and meta-analysis of data on octogenarians and nonagenarians who underwent isolated AVR were performed. RESULTS:The literature...
journal_title:American heart journal
pub_type: 杂志文章,meta分析,评审
doi:10.1016/j.ahj.2011.12.005
更新日期:2012-03-01 00:00:00
abstract::Heart failure is associated with a hypercoagulable state. A single-center, randomized, double-blind, placebo-controlled trial was performed to test the hypothesis that warfarin will modify a hypercoagulable state in heart failure. This study included 76 patients with heart failure. At baseline, patients had evidence f...
journal_title:American heart journal
pub_type: 临床试验,杂志文章,随机对照试验
doi:10.1016/s0002-8703(97)70103-0
更新日期:1997-07-01 00:00:00
abstract::Functional, ambulatory, community-dwelling subjects (n = 423, aged 75 to 85 years) underwent baseline 24-hour ambulatory electrocardiography (ECG) examinations as part of the Bronx Aging Study, a 10-year prospective cohort study designed to identify risk factors and disease markers for cardiovascular, cerebrovascular,...
journal_title:American heart journal
pub_type: 杂志文章
doi:10.1016/s0002-8703(96)90425-1
更新日期:1996-08-01 00:00:00
abstract::Probucol, a new cholesterol-lowering agent, was administered to ambulatory outpatients representing several classes of hyperlipoproteinemia (HL) for two years without dietary restriction. In 32 patients with Type II HL and 12 with Type IIB HL, statistically significant reduction in mean serum cholesterol levels occurr...
journal_title:American heart journal
pub_type: 临床试验,杂志文章
doi:10.1016/0002-8703(78)90088-1
更新日期:1978-08-01 00:00:00
abstract:BACKGROUND:Although the safety and cost-effectiveness of same-day discharge after uncomplicated transradial percutaneous coronary intervention (TR-PCI) is well established in Europe and Asia, such data are not available for US patients. METHODS:All patients who underwent TR-PCI at our high-volume US medical center bet...
journal_title:American heart journal
pub_type: 杂志文章
doi:10.1016/j.ahj.2008.07.018
更新日期:2008-12-01 00:00:00
abstract::Percutaneous transluminal coronary recanalization, a new therapeutic procedure used in acute myocardial infarction, offers significant reduction in mortality, as well as more effective limitation of the zone of infarction than has been possible with other pharmacologic treatment employed in the past. The risk of coron...
journal_title:American heart journal
pub_type: 杂志文章
doi:10.1016/0002-8703(81)90649-9
更新日期:1981-12-01 00:00:00
abstract::In order to study the origin of the basal systolic murmurs in mitral stenosis, left and right heart catheterization was performed in 18 patients with mitral stenosis using intracardiac phonocardiography. Our data revealed that the basal systolic murmurs originated in the aorta, the pulmonary artery, and the outflow tr...
journal_title:American heart journal
pub_type: 杂志文章
doi:10.1016/0002-8703(78)90163-1
更新日期:1978-10-01 00:00:00
abstract::To determine the prevalence and significance of exercise-induced localized perfusion defects in symptomatic patients with aortic valve disease, thallium-201 rest and exercise studies were performed in a consecutive series of 29 such patients prior to left heart catheterization with coronary arteriography. Eight patien...
journal_title:American heart journal
pub_type: 杂志文章
doi:10.1016/0002-8703(82)90535-x
更新日期:1982-01-01 00:00:00
abstract:BACKGROUND:Reliable predictors have yet to be found for recurrent ischemia after thrombolysis for acute myocardial infarction (AMI), nor do we know whether early angiography can herald recurrent ischemia. This study sought to investigate the relationship between recurrent ischemia and cardiac procedures after thromboly...
journal_title:American heart journal
pub_type: 杂志文章
doi:10.1067/mhj.2001.113226
更新日期:2001-04-01 00:00:00
abstract:BACKGROUND:Serum levels of pregnancy-associated plasma protein-A (PAPP-A) have recently been linked to plaque instability and are increased in acute coronary syndromes. The relation between PAPP-A levels and coronary risk factors, namely blood lipids, has not been studied to date. We have therefore investigated whether...
journal_title:American heart journal
pub_type: 杂志文章
doi:10.1016/S0002-8703(03)00446-0
更新日期:2003-12-01 00:00:00
abstract:BACKGROUND:Clinical outcomes and the effects of oral anticoagulants among patients with acute coronary syndrome (ACS) and either a history of or acute heart failure (HF) are largely unknown. We aimed to assess the relationship between prior HF or acute HF complicating an index ACS event and subsequent clinical outcomes...
journal_title:American heart journal
pub_type: 杂志文章,随机对照试验
doi:10.1016/j.ahj.2014.12.022
更新日期:2015-04-01 00:00:00
abstract::The effects of atrial pacing on the signal-averaged electrocardiogram were studied in 14 patients with remote myocardial infarction and a history of cardiac arrest or sustained ventricular tachycardia (group I) and in 13 patients with coronary artery disease and no history of sustained ventricular tachyarrhythmia (gro...
journal_title:American heart journal
pub_type: 杂志文章
doi:10.1016/s0002-8703(05)80077-8
更新日期:1990-01-01 00:00:00
abstract:BACKGROUND:Previous studies have generated inconsistent results when attempting to define predictors of stroke and death in patients with endocarditis. We sought to examine the relationship between vegetation 2-dimensional size and stroke in those with infective endocarditis (IE) and to identify differences between aor...
journal_title:American heart journal
pub_type: 杂志文章
doi:10.1067/mhj.2001.115790
更新日期:2001-07-01 00:00:00
abstract::Drug trials during electrophysiologic study were performed in 166 patients with sustained ventricular tachycardia (VT) or ventricular fibrillation. In the first 21 patients (group I), a maximum of two extrastimuli was used. In 145 subsequent patients (group II), drug efficacy was assessed using three extrastimuli if o...
journal_title:American heart journal
pub_type: 杂志文章
doi:10.1016/0002-8703(82)90432-x
更新日期:1982-11-01 00:00:00
abstract::This case report presents a young adult with asymmetric septal hypertrophy (ASH) and syncope. Infranodal complete heart block was demonstrated as his cause for syncope. Therapy consisted of implantation of a A-V sequential pacemaker. Cardiac output determinations and systolic time intervals demonstrated the beneficial...
journal_title:American heart journal
pub_type: 杂志文章
doi:10.1016/s0002-8703(77)80177-4
更新日期:1977-01-01 00:00:00
abstract:BACKGROUND:Patients with unstable angina (UA) and non-ST-elevation myocardial infarction (NSTEMI) remain at risk for death and cardiac ischemic events after being discharged from the hospital. METHODS:We examined whether the Thrombolysis In Myocardial Infarction (TIMI) risk score for UA/NSTEMI, ascertained at presenta...
journal_title:American heart journal
pub_type: 临床试验,杂志文章,随机对照试验
doi:10.1067/mhj.2002.122870
更新日期:2002-06-01 00:00:00