Abstract:
:We studied isochronal maps of ventricular activation during ventricular arrhythmias induced by programmed premature stimulation in dogs 3-5 days after ligation of the left anterior descending coronary artery. The entire epicardial surface and selective intramural sites were recorded using a computerized multiplexing technique. The electrophysiologic data were correlated with the anatomic characteristics of the infarction. In nine of 17 dogs (55%), the induced ventricular rhythm was due to reentrant activation in the surviving epicardial layer overlying the infarction. The irregular epicardial layer (up to 4 mm thick) had grossly intact myocardial fibers on microscopic examination but showed abnormal electrophysiologic characteristics. The stimulated premature beat that initiated reentry produced a continuous arc of functional conduction block within the surviving epicardial layer. The activation wave front circulated slowly around both ends of the arc of block, rejoined on the distal side of the arc before breaking through the arc to reactivate an area proximal to the block. This resulted in splitting of the initial single arc of block into two arcs. Reentrant activation continued as two synchronous circuits that traveled clockwise around one arc and counterwise around the other. Reentry spontaneously terminated when the leading edge of both reentrant circuits encountered refractory tissue, resulting in the coalescence of the two arcs of block into one. The present study may increase the understanding of the electrophysiologic mechanism of some ventricular repetitive responses and tachyarrhythmias induced by programmed premature stimulation in the clinical laboratory.
journal_name
Circulationjournal_title
Circulationauthors
Mehra R,Zeiler RH,Gough WB,El-Sherif Ndoi
10.1161/01.cir.67.1.11subject
Has Abstractpub_date
1983-01-01 00:00:00pages
11-24issue
1eissn
0009-7322issn
1524-4539journal_volume
67pub_type
杂志文章相关文献
CIRCULATION文献大全abstract:BACKGROUND:There is a paucity of randomized trials regarding diagnostic testing in women with suspected coronary artery disease (CAD). It remains unclear whether the addition of myocardial perfusion imaging (MPI) to the standard ECG exercise treadmill test (ETT) provides incremental information to improve clinical deci...
journal_title:Circulation
pub_type: 杂志文章,随机对照试验
doi:10.1161/CIRCULATIONAHA.111.029660
更新日期:2011-09-13 00:00:00
abstract:BACKGROUND:Inbred mouse strains C57BL/6J (B6) and C3H/HeJ (C3H) exhibit marked differences in atherosclerosis susceptibility. We sought to determine whether the difference in atherosclerosis susceptibility resides at the level of arterial walls. METHODS AND RESULTS:Thoracic aortic segments from 8-week-old female B6 an...
journal_title:Circulation
pub_type: 杂志文章
doi:10.1161/CIRCULATIONAHA.106.640185
更新日期:2006-11-28 00:00:00
abstract::Atherosclerotic coronary artery disease is the major cause of late cardiac transplant failure secondary to silent ischemia and infarction. To increase the longevity of cardiac homografts, we performed percutaneous transluminal coronary angioplasty (PTCA) in five male patients (aged 45 +/- 7 years, mean +/- SEM); 17 le...
journal_title:Circulation
pub_type: 杂志文章
doi:
更新日期:1988-11-01 00:00:00
abstract:BACKGROUND:Macrophage migration inhibitory factor (MIF), a cytokine that controls cell-mediated inflammatory responses, is upregulated in atherogenesis; however, its functional contribution to lesion development has not been evaluated. METHODS AND RESULTS:We studied the role of MIF on neointima lesion formation after ...
journal_title:Circulation
pub_type: 杂志文章
doi:10.1161/01.CIR.0000109201.72441.09
更新日期:2004-01-27 00:00:00
abstract:BACKGROUND:Although diabetes is a well-known risk factor of atherosclerotic cardiovascular diseases, the cardiovascular disease risk of glycemia below the current diabetic threshold remains uncertain. METHODS AND RESULTS:A total of 652,901 Korean men aged 30 to 64 years from the Korean National Health Insurance System...
journal_title:Circulation
pub_type: 杂志文章
doi:10.1161/CIRCULATIONAHA.108.776989
更新日期:2009-02-17 00:00:00
abstract::Patients with systemic morphological right ventricles (RVs), including congenitally corrected transposition of the great arteries and dextro-transposition of the great arteries with a Mustard or Senning atrial baffle repair, have a high likelihood of developing systemic ventricular dysfunction. Unfortunately, there ar...
journal_title:Circulation
pub_type: 杂志文章,meta分析
doi:10.1161/CIR.0000000000000604
更新日期:2019-04-02 00:00:00
abstract:BACKGROUND:Functional mitral regurgitation (MR) is caused by systolic traction on the mitral leaflets related to ventricular distortion. Little is known about whether chronic tethering causes the mitral leaflet area to adapt to the geometric needs imposed by tethering, in part because of inability to reconstruct leafle...
journal_title:Circulation
pub_type: 杂志文章
doi:10.1161/CIRCULATIONAHA.107.749440
更新日期:2008-08-19 00:00:00
abstract:BACKGROUND:A major advantage of coronary artery bypass graft surgery (CABG) relative to percutaneous coronary intervention is its durability, yet there is a paucity of information on rates and predictors of repeat coronary revascularization after CABG in the modern era. METHODS AND RESULTS:We included patients ≥65 yea...
journal_title:Circulation
pub_type: 杂志文章
doi:10.1161/CIRCULATIONAHA.113.001882
更新日期:2013-04-23 00:00:00
abstract:BACKGROUND:There are few data regarding medium-term outcome of coronary artery bypass grafting (CABG) in patients with severe left ventricular (LV) systolic dysfunction, particularly in the modern era, and even less assessing preoperative factors that might identify patients at highest risk. METHODS AND RESULTS:Three ...
journal_title:Circulation
pub_type: 杂志文章
doi:10.1161/CIRCULATIONAHA.105.000661
更新日期:2006-07-04 00:00:00
abstract:BACKGROUND:Patients with primary amyloidosis (AL type) have a poor prognosis, in part due to frequent cardiac involvement. Although intracardiac thrombus has been reported in anecdotal cases, neither its frequency nor its role in causing mortality is known. Furthermore, the clinical and echocardiographic variables that...
journal_title:Circulation
pub_type: 杂志文章
doi:10.1161/CIRCULATIONAHA.107.697763
更新日期:2007-11-20 00:00:00
abstract::To determine whether calcium channel blockers influence the progression of coronary atherosclerosis, 383 patients age 65 years or less with 5-75% stenoses in at least four coronary artery segments were selected at random within 1 month of coronary arteriography to participate in double-blind therapy with a placebo or ...
journal_title:Circulation
pub_type: 临床试验,杂志文章
doi:10.1161/01.cir.82.6.1940
更新日期:1990-12-01 00:00:00
abstract:BACKGROUND:Adrenergic activation is thought to be an important determinant of outcome in subjects with chronic heart failure (CHF), but baseline or serial changes in adrenergic activity have not been previously investigated in a large patient sample treated with a powerful antiadrenergic agent. METHODS AND RESULTS:Sys...
journal_title:Circulation
pub_type: 临床试验,杂志文章,多中心研究,随机对照试验
doi:10.1161/01.CIR.0000141297.50027.A4
更新日期:2004-09-14 00:00:00
abstract::Blood pressure and heart rate of 15 male shift workers were measured every 15 minutes for 24 hours during three work shifts: morning, 4:00 AM to noon; afternoon, noon to 8:00 PM; and night, 8:00 PM to 4:00 AM. For each shift, 24-hour systolic and diastolic blood pressure showed a large "trough" (the low pressure span)...
journal_title:Circulation
pub_type: 杂志文章
doi:10.1161/01.cir.80.2.341
更新日期:1989-08-01 00:00:00
abstract:BACKGROUND:Although beta-adrenergic receptor (AR) blockade therapy is beneficial in the treatment of heart failure, little is known regarding the transcriptional mechanisms underlying this salutary action. METHODS AND RESULTS:In the present study, we screened mice overexpressing Gsalpha, beta1AR, beta2AR, or protein k...
journal_title:Circulation
pub_type: 杂志文章
doi:10.1161/01.CIR.0000101922.18151.7B
更新日期:2003-12-09 00:00:00
abstract:BACKGROUND:Because acute exercise increases systemic catecholamines, we sought to determine whether exercise training would alter daily or exercise-related catecholamine release and inactivation. METHODS AND RESULTS:In 24-hour urine collections, catecholamines and metabolites provided indexes of overall oxidative deam...
journal_title:Circulation
pub_type: 杂志文章
doi:10.1161/01.cir.84.6.2346
更新日期:1991-12-01 00:00:00
abstract:BACKGROUND:The accumulation of macrophage-derived foam cells in atherosclerotic lesions correlates with increased local release of matrix-degrading metalloproteinases (MMPs) and a thin fibrous cap. The activity of these enzymes is controlled by specific tissue inhibitors of metalloproteinases (TIMPs). METHODS AND RESU...
journal_title:Circulation
pub_type: 杂志文章
doi:10.1161/01.cir.99.3.420
更新日期:1999-01-26 00:00:00
abstract:BACKGROUND:In diabetic patients in the Evaluation of Platelet IIb/IIIa Inhibitor for Stenting (EPISTENT) trial, abciximab reduced target vessel revascularization by approximately 50% compared with placebo. Whether this is a result of a lower restenosis rate caused by inhibition of intimal hyperplasia remains to be defi...
journal_title:Circulation
pub_type: 临床试验,杂志文章,随机对照试验
doi:10.1161/01.CIR.0000116752.12261.D4
更新日期:2004-02-24 00:00:00
abstract::Diseases that cause symptoms incompletely relieved by available modes of treatment stimulate search for new therapies. Chronic disease processes, in which interventions are palliative rather than curative provide a particular challenge in determining the value of therapeutic intervention. Management of patients with a...
journal_title:Circulation
pub_type: 临床试验,杂志文章
doi:
更新日期:1982-01-01 00:00:00
abstract:BACKGROUND:Clinical studies have demonstrated the efficacy of intravenous administration of agents that block platelet glycoprotein IIb/IIIa receptors in the setting of percutaneous coronary revascularization. Although the optimal duration of treatment has not been determined, more prolonged receptor blockade has been ...
journal_title:Circulation
pub_type: 临床试验,杂志文章,随机对照试验
doi:10.1161/01.cir.96.1.76
更新日期:1997-07-01 00:00:00
abstract:BACKGROUND:Metabolic syndrome importantly accelerates the atherosclerotic process, the earliest event of which is endothelial dysfunction. Ghrelin, a gastric peptide with cardiovascular actions, has been shown to inhibit proatherogenic changes in experimental models. This study therefore investigated whether ghrelin ad...
journal_title:Circulation
pub_type: 临床试验,杂志文章
doi:10.1161/CIRCULATIONAHA.105.553883
更新日期:2005-11-08 00:00:00
abstract::To study the variability of the fraction of CPK released from the infarcted heart which enters the serum (serum entry ratio, or SER) with size and model of infarction, nine dogs underwent homogeneous infarctions (LAD ligation) of varying sizes, and 10 dogs underwent scattered infarctions (left coronary embolization). ...
journal_title:Circulation
pub_type: 杂志文章
doi:10.1161/01.cir.58.6.1143
更新日期:1978-12-01 00:00:00
abstract::For monotherapy, beta-blockers and calcium-entry blockers are effective and safe antianginal medications. For prophylaxis of myocardial ischemia, a different mechanism of action for each class of drugs is reflected by the different heart rate and rate-pressure product during exercise. In patients who continue to have ...
journal_title:Circulation
pub_type: 临床试验,杂志文章
doi:
更新日期:1987-06-01 00:00:00
abstract::Proton (hydrogen-1) magnetic resonance imaging techniques have potential for the detection and characterization of changes associated with myocardial ischemia. Since image contrast is dependent on T1 and T2 relaxation times, we examined these parameters in a canine preparation of occlusion of the left anterior descend...
journal_title:Circulation
pub_type: 杂志文章
doi:10.1161/01.cir.71.3.595
更新日期:1985-03-01 00:00:00
abstract:BACKGROUND:Angiogenesis is a critical feature of plaque development in atherosclerosis and might play a key role in both the initiation and later rupture of plaques that lead to myocardial infarction and stroke. The precursory molecular or cellular events that initiate plaque growth and that ultimately contribute to pl...
journal_title:Circulation
pub_type: 杂志文章
doi:10.1161/01.CIR.0000093185.16083.95
更新日期:2003-11-04 00:00:00
abstract:BACKGROUND:Catheter ablation of the posteroseptal right atrium has been proposed for control of ventricular rate in patients with tachycardic atrial fibrillation (AF). However, the exact mechanism of rate control is unclear. Because the ablation site corresponds to the location of the slow pathway in patients with AV n...
journal_title:Circulation
pub_type: 杂志文章
doi:10.1161/01.cir.93.2.277
更新日期:1996-01-15 00:00:00
abstract:BACKGROUND:Exercise echocardiography (digital cine-loop technique) and 201Tl single-photon emission computed tomography (SPECT) were performed simultaneously in 292 patients being evaluated for coronary artery disease. METHODS AND RESULTS:Pretreadmill and posttreadmill echocardiographic images of diagnostic quality we...
journal_title:Circulation
pub_type: 杂志文章
doi:10.1161/01.cir.85.3.1026
更新日期:1992-03-01 00:00:00
abstract:BACKGROUND:Aortopulmonary collaterals (APC) have been associated with an increased risk of choreoathetosis after deep hypothermic circulatory arrest (DHCA). To study the effects of APC on cerebral hemodynamics and metabolism before and after DHCA, a piglet model was developed. METHODS AND RESULTS:Protocol 1: Eight 4- ...
journal_title:Circulation
pub_type: 杂志文章
doi:10.1161/01.cir.92.9.490
更新日期:1995-11-01 00:00:00
abstract:BACKGROUND:Previous studies have shown that thrombin is a potent though slow-acting mitogen for vascular smooth muscle cells (SMC). Because thrombin generation in vivo is accompanied by platelet activation, it has been suggested that platelet-derived factors might enhance thrombin-induced SMC proliferation. No informat...
journal_title:Circulation
pub_type: 杂志文章
doi:10.1161/01.cir.97.6.589
更新日期:1998-02-17 00:00:00
abstract::Absence of continuity between the heart and the pulmonary arteries has the potential for total correction. When the pulmonary arteries are narrow, a palliative first stage systemic-pulmonary arterial anastomosis serves to enlarge the pulmonary arteries so that, with time, they become of adequate caliber for total corr...
journal_title:Circulation
pub_type: 杂志文章
doi:10.1161/01.cir.54.5.834
更新日期:1976-11-01 00:00:00
abstract:BACKGROUND:Increased consumption of sugar-sweetened beverages (SSBs) has been associated with an elevated risk of obesity, metabolic syndrome, and type II diabetes mellitus. However, the effects of SSB consumption on blood pressure (BP) are uncertain. The objective of this study was to determine the relationship betwee...
journal_title:Circulation
pub_type: 杂志文章,多中心研究,随机对照试验
doi:10.1161/CIRCULATIONAHA.109.911164
更新日期:2010-06-08 00:00:00