Abstract:
:The present experiments were conducted on isolated dog hearts to demonstrate that conduction disturbances can be induced in the bundle branches by transection of about 50 per cent of the cross-sectional area of the His bundle on the right or left side. The His bundle, the posterior and anterior divisions of left bundle, and the right bundle were exposed by careful dissection, and microelectrode techniques were used to record action potentials from the three bundle branches. Pacing stimuli were applied to the nonbranching portion of His bundle proximal and then distal to the site of transection to study the effect of such lesions on impulse conduction to the bundle branches. It was demonstrated that conduction to the bundle branches was not affected by such lesions in the His bundle at pacing rates slower than 100 per minute; however, conduction disturbances were rate-dependent and manifested at faster pacing rates. In nine out of all 16 experiments, partial or complete block occurred in all three bundle branches regardless of the side of the lesion. In the remaining seven experiments, they were observed in the bundle branch on the same side as the lesion. It was assumed that conduction disturbances of the bilateral bundle branches resulted from decremental conduction in the uncut portion of His at the level of lesion, and those of the ipsilateral branch from the functional failure of transverse crossover connections between the longitudinal His bundle fibers. The results indicate that localized lesions in the nonbranching portion of His bundle can indeed produce the pattern of bundle branch block under certain conditions.
journal_name
Am Heart Jjournal_title
American heart journalauthors
Fabregas RA,Tse WW,Han Jdoi
10.1016/s0002-8703(76)80117-2subject
Has Abstractpub_date
1976-09-01 00:00:00pages
356-62issue
3eissn
0002-8703issn
1097-6744pii
S0002-8703(76)80117-2journal_volume
92pub_type
杂志文章abstract::There has been skepticism since the early days of open heart surgery that good long-term or even short-term results were possible with repair of pure mitral insufficiency. The authors report 145 patients in whom a markedly insufficient mitral valve was repaired 6 months to 17 years previously and another 55 patients i...
journal_title:American heart journal
pub_type: 杂志文章
doi:10.1016/0002-8703(78)90094-7
更新日期:1978-08-01 00:00:00
abstract::One hundred four patients (101 men, three women), under 40 years of age, with myocardial infarction (MI), underwent coronary arteriography. Eighty patients had significant obstructive coronary artery disease (CAD) (group 1), 23 had normal coronary arteries (group 2), and one patient had coronary ostial stenosis as a r...
journal_title:American heart journal
pub_type: 杂志文章
doi:10.1016/0002-8703(86)90680-0
更新日期:1986-07-01 00:00:00
abstract::Technetium 99m-Q12 is a new cationic myocardial perfusion imaging agent that produces excellent images in human beings. The purpose of this study was to examine the separate effects of hypoxia and low flow on myocardial clearance kinetics. After a 1 mCi bolus injection, myocardial 99mTc-Q12 clearance was monitored for...
journal_title:American heart journal
pub_type: 杂志文章
doi:10.1016/s0002-8703(96)90397-x
更新日期:1996-07-01 00:00:00
abstract::The Magnum/Magnarail system consists of "over-the-wire" balloon catheters and a 0.021 inch (0.53 mm) guide wire with a 1 mm olive-shaped tip. To compare it to conventional systems, 100 consecutive unselected patients with chronic total coronary occlusions were randomly assigned to one of two groups. If the balloon cou...
journal_title:American heart journal
pub_type: 临床试验,杂志文章,随机对照试验
doi:10.1016/0002-8703(92)91020-2
更新日期:1992-05-01 00:00:00
abstract:BACKGROUND:The objective of this study was to determine if depression is associated with worse disease-specific functional status in patients with coronary artery disease. The study was designed as a cross-sectional survey and 3-month longitudinal cohort. METHODS AND RESULTS:The study took place in outpatient clinics ...
journal_title:American heart journal
pub_type: 杂志文章
doi:10.1067/mhj.2000.106600
更新日期:2000-07-01 00:00:00
abstract:BACKGROUND:beta-blockers have been shown to benefit patients after myocardial infarction by decreasing mortality, sudden cardiac death, and reinfarction. Although beta-blockers are recommended for all patients with acute coronary syndromes (ACS) without contraindications, a target heart rate (HR) is recommended only fo...
journal_title:American heart journal
pub_type: 杂志文章
doi:10.1016/j.ahj.2009.06.023
更新日期:2009-09-01 00:00:00
abstract:BACKGROUND:Current practice related to the management of atrial fibrillation (AF) complicating coronary artery bypass grafting (CABG) is uncertain. METHODS:We examined management of post-CABG AF in the PREVENT-IV trial, and we explored patterns of use of postoperative rhythm versus rate control and anticoagulation for...
journal_title:American heart journal
pub_type: 杂志文章,随机对照试验
doi:10.1016/j.ahj.2009.09.003
更新日期:2009-11-01 00:00:00
abstract::There are many similarities between the clinical features of viral heart disease and of rheumatic carditis, as defined in the revised Jones criteria for the diagnosis of rheumatic fever. Because of this, it is likely that viral heart disease has been, and still is, diagnosed as rheumatic. This situation can be avoided...
journal_title:American heart journal
pub_type: 杂志文章
doi:10.1016/s0002-8703(76)80137-8
更新日期:1976-05-01 00:00:00
abstract::The duration of intravenous heparin therapy required to maintain patency of the infarct-related artery after intravenous streptokinase is uncertain. Twenty-eight patients were prospectively treated with 1.5 million units of intravenous streptokinase within 4 hours of onset of chest pain. Intravenous heparin was begun ...
journal_title:American heart journal
pub_type: 杂志文章
doi:10.1016/0002-8703(88)90870-8
更新日期:1988-04-01 00:00:00
abstract::Selective inhibition of sinus node function offers the possibility to decrease heart rate and reduce myocardial oxygen consumption in patients with impaired cardiac function, if myocardial contractility is not further attenuated. To study the influence of a specific sinus node inhibitor on myocardial function, alinidi...
journal_title:American heart journal
pub_type: 杂志文章
doi:10.1016/s0002-8703(05)80185-1
更新日期:1990-06-01 00:00:00
abstract::To evaluate regional differences in thickness and systolic function of human myocardium perfused by angiographically normal coronary arteries in valvular and ischemic heart disease, we performed intraoperative epicardial M-mode mapping of ventriculographically normal wall regions (perfused by normal coronary arteries)...
journal_title:American heart journal
pub_type: 杂志文章
doi:10.1016/0002-8703(86)90273-5
更新日期:1986-08-01 00:00:00
abstract::"Stunned" myocardium prevents the assessment of myocardial salvage after streptokinase. In order to unmask "stunning," we sought to evaluate left ventricular inotropic contractile reserve of patients after streptokinase. Radionuclide ventriculograms were obtained in 75 consecutive patients 2 weeks after myocardial inf...
journal_title:American heart journal
pub_type: 杂志文章
doi:10.1016/0002-8703(86)90628-9
更新日期:1986-05-01 00:00:00
abstract::Fenoldopam mesylate (SK&F 82526-J) is a novel benzazepine derivative. It has selective agonist activity at post-junctional (DA1) vascular dopaminergic receptors, which normally subserve renal artery vasodilation. Previous studies in normal subjects and in patients with hypertension indicate that fenoldopam increases r...
journal_title:American heart journal
pub_type: 杂志文章
doi:10.1016/0002-8703(88)90620-5
更新日期:1988-08-01 00:00:00
abstract:BACKGROUND:High mortality rates were reported in ST-elevation myocardial infarction (STEMI) patients undergoing primary percutaneous coronary interventions (PPCI) "off-hours." The objective of this study was to evaluate this issue in a more recent population of patients with STEMI treated with PPCI in a high-volume ter...
journal_title:American heart journal
pub_type: 杂志文章
doi:10.1016/j.ahj.2007.04.025
更新日期:2007-08-01 00:00:00
abstract::Current antitachycardia systems are incapable of adequately distinguishing stable from unstable tachycardias. Previously, integration of a pressure sensor or an impedance sensor, together with electrogram analysis, has been investigated as an improved method of identifying unstable arrhythmias. A mixed venous oxygen s...
journal_title:American heart journal
pub_type: 杂志文章
doi:10.1016/0002-8703(91)90519-n
更新日期:1991-09-01 00:00:00
abstract::The purpose of this study was to assess the recovery of the left ventricular pressure (PLV), and the incidence and type of arrhythmias after effective low-dose defibrillation (Imax = 18-70 A) in healthy hearts and in hearts with acute myocardial infarction (AMI) in the intact dog. In fifteen dogs 84 episodes of fibril...
journal_title:American heart journal
pub_type: 杂志文章
doi:10.1016/0002-8703(83)90195-3
更新日期:1983-08-01 00:00:00
abstract:BACKGROUND:The purpose of this study is to assess incidence and risk factors for severe renal dysfunction in patients requiring oral anticoagulation to help guide initial drug choice and provide a rational basis for interval monitoring of renal function for patients prescribed non-vitamin K oral anticoagulants. METHOD...
journal_title:American heart journal
pub_type: 杂志文章
doi:10.1016/j.ahj.2016.08.017
更新日期:2017-02-01 00:00:00
abstract:BACKGROUND:Bleeding is associated with adverse outcome in acute coronary syndromes. However, the precise pathophysiologic mechanisms have not been elucidated. We sought to determine the relationship between bleeding and myocardial ischemia detected by concurrent continuous electrocardiogram (ECG) monitoring and their i...
journal_title:American heart journal
pub_type: 杂志文章,随机对照试验
doi:10.1016/j.ahj.2008.05.022
更新日期:2008-10-01 00:00:00
abstract::As Q wave and ST segment elevation in leads V1 to V3 may be due either to right ventricular infarction (RVI) or to anterior left ventricular infarction (ALVI), 72 autopsy patients with acute myocardial infarction who had had conventional 12-lead ECG records were studied to determine the accuracy of these ECG criteria,...
journal_title:American heart journal
pub_type: 杂志文章
doi:10.1016/0002-8703(86)90304-2
更新日期:1986-11-01 00:00:00
abstract:BACKGROUND:Patients with an implantable cardioverter defibrillator (ICD) are at increased risk of anxiety disorders. In turn, anxiety has been identified as a precipitant of ventricular arrhythmias. Anxiety may in part be attributed to concerns about the ICD firing, but the relationship between ICD concerns, psychologi...
journal_title:American heart journal
pub_type: 杂志文章
doi:10.1016/j.ahj.2004.06.031
更新日期:2005-04-01 00:00:00
abstract:BACKGROUND:This study was designed to investigate the efficacy of alteplase double-bolus dosing compared with the front-loaded 90-minute infusion regimen in patients with acute myocardial infarction. Recent pilot studies have suggested that bolus dosing may provide improved efficacy in establishing early, complete, and...
journal_title:American heart journal
pub_type: 临床试验,杂志文章,多中心研究,随机对照试验
doi:10.1016/s0002-8703(98)70024-9
更新日期:1998-10-01 00:00:00
abstract:BACKGROUND:Declines in case fatality post-myocardial infarction (MI) have been observed over the past 3 decades. Few studies report socioeconomic disparities in survival post-MI. METHODS:We assessed 1-year case fatality among 9,116 incident MI patients included in the Atherosclerosis Risk in Communities community surv...
journal_title:American heart journal
pub_type: 杂志文章
doi:10.1016/j.ahj.2012.10.022
更新日期:2013-01-01 00:00:00
abstract::Contrast bidimensional echocardiographic (2DE) studies were performed in eight patients with d-transposition of the great vessels in the postoperative period of the Senning technique. Contrast was injected into a peripheral vein of all patients, and into the arterial atrium in five in the postoperative period. The 2DE...
journal_title:American heart journal
pub_type: 杂志文章
doi:10.1016/0002-8703(84)90552-0
更新日期:1984-07-01 00:00:00
abstract::We devised a nine-lead Holter monitor system with a lead-switching technique to record electrocardiograms from multiple sites in the anterior and the posterior or lateral chest. Leads CM1 to CM6, high lateral (HL), low lateral (LL), and low posterior chest (LB) were used. The sensitivity, specificity, and predictive a...
journal_title:American heart journal
pub_type: 临床试验,杂志文章
doi:10.1016/0002-8703(94)90595-9
更新日期:1994-11-01 00:00:00
abstract::Complex coronary morphologic abnormalities with thrombus and ulceration have been recognized in acute ischemic syndromes by angiography, angioscopy, and autopsy. However, in vivo histopathologic correlates of unstable ischemic syndromes have not been described. The purpose of this study was to characterize intracorona...
journal_title:American heart journal
pub_type: 杂志文章
doi:10.1016/0002-8703(94)90612-2
更新日期:1994-09-01 00:00:00
abstract:BACKGROUND:Cardiac resynchronization therapy (CRT) improves symptoms, reduces heart failure (HF)-related hospitalizations, and reverses left ventricular remodeling in some patients with moderate to severe HF and ventricular dyssynchrony defined by a prolonged QRS duration. The effects of CRT on HF outcomes in patients ...
journal_title:American heart journal
pub_type: 杂志文章
doi:10.1016/j.ahj.2005.03.002
更新日期:2006-02-01 00:00:00
abstract:BACKGROUND:In the United States as well as globally, Asians are a growing proportion of patients presenting with non-ST-segment elevation myocardial infarction (NSTEMI), yet little is known about their longitudinal outcomes. METHODS:We linked Centers for Medicare & Medicaid claims data to detailed clinical data for 37...
journal_title:American heart journal
pub_type: 杂志文章
doi:10.1016/j.ahj.2013.10.001
更新日期:2013-12-01 00:00:00
abstract:BACKGROUND:The study evaluates whether Optison used during dobutamine stress echocardiography (DSE) will improve endocardial border definition and whether this will translate to an improvement in sensitivity and specificity of the test in patients with poor echocardiographic windows. DSE is extremely valuable in the wo...
journal_title:American heart journal
pub_type: 杂志文章
doi:10.1067/mhj.2001.117608
更新日期:2001-11-01 00:00:00
abstract:BACKGROUND:Bleeding and blood transfusion are associated with increased morbidity and mortality among patients with non-ST-segment elevation acute coronary syndromes (NSTE ACS); however, the economic consequences of these complications are not well defined. We sought to determine the relationship between bleeding, bloo...
journal_title:American heart journal
pub_type: 杂志文章,随机对照试验
doi:10.1016/j.ahj.2007.10.014
更新日期:2008-02-01 00:00:00
abstract::A 17-year-old man with staphylococcal endocarditis of the mitral valve developed an infective aneurysm of the posterior left ventricular wall. Echocardiography revealed an echo-free space posterior to the posterior left ventricular wall. This echo-free space undoubtedly represented the aneurysmal sac, because it could...
journal_title:American heart journal
pub_type: 杂志文章
doi:10.1016/0002-8703(78)90051-0
更新日期:1978-09-01 00:00:00