Abstract:
:Major clinical uses of the new Doppler color flow mapping technologies involve the imaging of disturbed flow through cardiac defects or valves. Nevertheless, there is little general understanding of the determinants of flow and of how flow is imaged by these new systems. This review will attempt to relate the hydrodynamics through a simplified stenotic or regurgitant orifice with the physics and sampling theories relevant to the functioning of Doppler color flow mapping systems. The goal will be to characterize the velocity resolution, spatial resolution, sensitivity and performance of these systems so that clinicians can understand why flow looks the way it does on Doppler color studies and which aspects of flow mapping can be expected to become more quantifiable than they are at present.
journal_name
J Am Coll Cardioljournal_title
Journal of the American College of Cardiologyauthors
Sahn DJdoi
10.1016/0735-1097(88)92621-6subject
Has Abstractpub_date
1988-11-01 00:00:00pages
1354-65issue
5eissn
0735-1097issn
1558-3597pii
0735-1097(88)92621-6journal_volume
12pub_type
杂志文章abstract:OBJECTIVES:This prospective, multicenter trial was aimed at defining efficacy and safety of low energy shocks during atrial fibrillation in a diverse cohort of patients. BACKGROUND:Experimental studies in sheep and preliminary data in humans have suggested that low energy internal shocks delivered between right atrial...
journal_title:Journal of the American College of Cardiology
pub_type: 临床试验,杂志文章,多中心研究
doi:10.1016/s0735-1097(96)00583-9
更新日期:1997-03-15 00:00:00
abstract:OBJECTIVES:The purpose of this study was to assess myocardial blood flow (MBF) using positron emission tomography in patients with hypertrophic cardiomyopathy (HCM) according to genetic status. BACKGROUND:Coronary microvascular dysfunction is an important feature of HCM, associated with ventricular remodeling and hear...
journal_title:Journal of the American College of Cardiology
pub_type: 杂志文章
doi:10.1016/j.jacc.2011.05.018
更新日期:2011-08-16 00:00:00
abstract::To determine whether long-term blood pressure levels correlate with left ventricular mass, echocardiographic measurements were performed in 152 men and 299 women who were participants in the Framingham Heart Study. All subjects were free of obesity and cardiovascular and pulmonary disease, were not taking antihyperten...
journal_title:Journal of the American College of Cardiology
pub_type: 杂志文章
doi:10.1016/0735-1097(91)90549-o
更新日期:1991-11-01 00:00:00
abstract:OBJECTIVES:The objective of this study was to evaluate the effects of different lesion sets of ablation in patients undergoing mitral surgery plus maze. BACKGROUND:The role of lesion sets on outcome after maze is poorly defined. METHODS:A total of 141 patients were prospectively followed up. Two different lesion sets...
journal_title:Journal of the American College of Cardiology
pub_type: 杂志文章
doi:10.1016/j.jacc.2010.09.055
更新日期:2011-02-22 00:00:00
abstract:OBJECTIVES:We tested the hypothesis that enalaprilat induces preconditioning (PC)-mimetic actions in patients with stable coronary artery disease. BACKGROUND:Angiotensin-converting enzyme (ACE) inhibitors increase the bioavailability of bradykinin, which induces cardiac PC. METHODS:Twenty-two patients undergoing coro...
journal_title:Journal of the American College of Cardiology
pub_type: 杂志文章,随机对照试验
doi:10.1016/j.jacc.2007.01.060
更新日期:2007-04-17 00:00:00
abstract::This article deals with the question of whether or not the risk factor concept, a principal aspect of preventive cardiology, has contributed to patient care in coronary heart disease. The risk factors considered are plasma cholesterol, high blood pressure, smoking, diabetes and marked obesity. With the exception of pl...
journal_title:Journal of the American College of Cardiology
pub_type: 杂志文章
doi:10.1016/s0735-1097(83)80006-0
更新日期:1983-01-01 00:00:00
abstract:OBJECTIVES:The aim of this study was to investigate the effects of rapid electrical stimulation (RES) of contraction on the expression of connexin (Cx)43 gap junction in neonatal rat cultured ventricular myocytes and the consequent changes of conduction properties. BACKGROUND:The expression and distribution of gap jun...
journal_title:Journal of the American College of Cardiology
pub_type: 杂志文章
doi:10.1016/j.jacc.2004.05.054
更新日期:2004-08-18 00:00:00
abstract::Seventeen patients (16 men and 1 woman) were challenged with isoproterenol after their initially inducible sustained ventricular tachyarrhythmia (monomorphic tachycardia in 14 patients and fibrillation in 3) was completely suppressed by class I antiarrhythmic drugs. Coronary artery disease was documented in 11 patient...
journal_title:Journal of the American College of Cardiology
pub_type: 杂志文章
doi:10.1016/0735-1097(89)90114-9
更新日期:1989-09-01 00:00:00
abstract::Relief of left ventricular (LV) outflow obstruction in patients with hypertrophic cardiomyopathy (HCM) and disabling symptoms refractory to maximum medical management has historically been a surgical problem. Surgical septal myectomy permanently abolishes systolic anterior motion of the mitral valve and mitral regurgi...
journal_title:Journal of the American College of Cardiology
pub_type: 杂志文章,评审
doi:10.1016/j.jacc.2004.04.063
更新日期:2004-11-16 00:00:00
abstract::To assess left ventricular diastolic filling in amyloid heart disease, 17 patients with familial amyloid polyneuropathy and 20 normal subjects were examined by radionuclide angiography. None of the patients showed clinical evidence of restrictive cardiomyopathy. All but two patients had normal left ventricular ejectio...
journal_title:Journal of the American College of Cardiology
pub_type: 杂志文章
doi:10.1016/0735-1097(89)90547-0
更新日期:1989-01-01 00:00:00
abstract::The technique of intracoronary stenting has achieved remarkable progress over the last few years. Improved stent deployment techniques and optimization of postprocedural management have dramatically improved the safety of intracoronary stent placement. At present, the incidence of early vessel closure after stenting i...
journal_title:Journal of the American College of Cardiology
pub_type: 杂志文章,评审
doi:10.1016/0735-1097(95)00548-4
更新日期:1996-03-15 00:00:00
abstract:BACKGROUND:Limited data exist regarding transcatheter mitral valve replacement (TMVR) for patients with failed mitral valve replacement and repair. OBJECTIVES:This study sought to evaluate the outcomes of TMVR in patients with failed mitral bioprosthetic valves (valve-in-valve [ViV]) and annuloplasty rings (valve-in-r...
journal_title:Journal of the American College of Cardiology
pub_type: 杂志文章,多中心研究
doi:10.1016/j.jacc.2017.07.714
更新日期:2017-08-29 00:00:00
abstract:OBJECTIVES:We hypothesized that intravascular ultrasound may identify significant coronary artery narrowing in the mildly diseased coronary artery of patients with insignificant or one- or two-vessel coronary artery disease. BACKGROUND:Necropsy studies have revealed that coronary angiography may underestimate stenosis...
journal_title:Journal of the American College of Cardiology
pub_type: 杂志文章
doi:10.1016/0735-1097(93)90770-2
更新日期:1993-12-01 00:00:00
abstract:OBJECTIVES:We sought to examine whether marine-derived n-3 fatty acids are associated with less atherosclerosis in Japanese versus white populations in the U.S. BACKGROUND:Marine-derived n-3 fatty acids at low levels are cardioprotective through their antiarrhythmic effect. METHODS:A population-based cross-sectional ...
journal_title:Journal of the American College of Cardiology
pub_type: 杂志文章
doi:10.1016/j.jacc.2008.03.047
更新日期:2008-08-05 00:00:00
abstract:OBJECTIVES:This study sought to determine whether residual myocardial viability determined by myocardial contrast echocardiography (MCE) after acute myocardial infarction (AMI) can predict hard cardiac events. BACKGROUND:Myocardial viability detected by MCE has been shown to predict recovery of left ventricular (LV) f...
journal_title:Journal of the American College of Cardiology
pub_type: 杂志文章
doi:10.1016/j.jacc.2007.03.036
更新日期:2007-07-24 00:00:00
abstract:BACKGROUND:P2Y12 inhibitor monotherapy with ticagrelor after a brief period of dual antiplatelet therapy can reduce bleeding without increasing ischemic harm after percutaneous coronary intervention (PCI). The impact of this approach among patients with diabetes mellitus (DM) remains unknown. OBJECTIVES:The purpose of...
journal_title:Journal of the American College of Cardiology
pub_type: 杂志文章,多中心研究,随机对照试验
doi:10.1016/j.jacc.2020.03.008
更新日期:2020-05-19 00:00:00
abstract:BACKGROUND:Heart transplant recipients are at high risk for mortality, with traditional risk scores performing modestly in predicting post-transplant survival, underscoring the importance of as yet unidentified factors in determining prognosis. In this analysis, the association between PM2.5 exposure levels and surviva...
journal_title:Journal of the American College of Cardiology
pub_type: 杂志文章
doi:10.1016/j.jacc.2019.09.066
更新日期:2019-12-17 00:00:00
abstract::Myocardial reperfusion after reversible regional ischemia is known to result in delayed recovery of contractile function, but the mechanism responsible for this phenomenon remains unclear. We examined the ability of N-2-mercaptopropionylglycine, a synthetic thiol compound with oxygen free radical scavenging properties...
journal_title:Journal of the American College of Cardiology
pub_type: 杂志文章
doi:10.1016/s0735-1097(86)80396-5
更新日期:1986-11-01 00:00:00
abstract:OBJECTIVES:The goal of this study was to investigate the nature of the association between silent ischemia and postoperative myocardial infarction (PMI). BACKGROUND:Silent ischemia predicts cardiac morbidity and mortality in both ambulatory and postoperative patients. Whether silent stress-induced ischemia is merely a...
journal_title:Journal of the American College of Cardiology
pub_type: 杂志文章
doi:10.1016/s0735-1097(01)01265-7
更新日期:2001-06-01 00:00:00
abstract:OBJECTIVES:We evaluated the prevalence and prognostic significance of transient myocardial ischemia despite beta-adrenergic blockade in patients with coronary artery disease. BACKGROUND:Persistence of transient ischemia despite therapy may correspond to a subset of high risk patients with coronary disease. The impact ...
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(96)00050-2
更新日期:1996-06-01 00:00:00
abstract::To evaluate the risks of and optimal method for valve dilation in aortic stenosis, balloons of different sizes were used to dilate the normal aortic root in 16 lambs and then stenotic valves in 15 children. In the lambs, inflated balloon to aortic anulus diameter ratios ranged from 0.9 to 1.5. These hearts were examin...
journal_title:Journal of the American College of Cardiology
pub_type: 杂志文章
doi:10.1016/s0735-1097(87)80237-1
更新日期:1987-04-01 00:00:00
abstract::The prevalence of an abnormal signal-averaged electrocardiogram (ECG) and ventricular arrhythmias on 24 h ambulatory electrocardiography was evaluated in 118 patients 13 +/- 2 days after acute myocardial infarction. Group 1 (46 patients) underwent intravenous thrombolysis within 6 h of the onset of symptoms, whereas G...
journal_title:Journal of the American College of Cardiology
pub_type: 杂志文章
doi:10.1016/s0735-1097(10)80012-9
更新日期:1990-05-01 00:00:00
abstract::The utility of using an endurance test as well as a maximal exercise test to assess the effect of amlodipine, a dihydropyridine calcium antagonist, was evaluated in 16 patients with angina pectoris. Amlodipine, 10 mg/day, was compared with placebo in a double blind crossover study. After a 2 week single blind placebo ...
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(88)90323-3
更新日期:1988-09-01 00:00:00
abstract:BACKGROUND:In the months after acute myocardial infarction (MI), risk for acute atherothrombotic events in nonculprit arteries increases several fold. OBJECTIVES:This study investigated whether sustained proinflammatory and prothrombotic endothelial alterations occur in remote vessels after MI. METHODS:Wild-type mice...
journal_title:Journal of the American College of Cardiology
pub_type: 杂志文章
doi:10.1016/j.jacc.2018.06.044
更新日期:2018-08-28 00:00:00
abstract:BACKGROUND:Guidewire manipulation time is rarely used in chronic total occlusion (CTO) percutaneous coronary intervention (PCI) strategies. OBJECTIVES:This study sought to develop an algorithm based on angiographic characteristics and guidewire manipulation time. METHODS:This study assessed 5,843 patients undergoing ...
journal_title:Journal of the American College of Cardiology
pub_type: 杂志文章
doi:10.1016/j.jacc.2019.08.1049
更新日期:2019-11-12 00:00:00
abstract:OBJECTIVES:The aim of this study was to quantify and compare effective doses from conventional angiography and multislice computed tomography (MSCT) coronary angiography using a 16-slice scanner. BACKGROUND:Multislice computed tomography is now a viable modality for cardiac imaging. However, for any diagnostic use of ...
journal_title:Journal of the American College of Cardiology
pub_type: 杂志文章
doi:10.1016/j.jacc.2005.11.078
更新日期:2006-05-02 00:00:00
abstract:OBJECTIVES:This study was undertaken to assess prospectively the prognostic power of early ST segment elevation resolution in a large cohort of patients with myocardial infarction and to test the value of differences in ST segment resolution as a surrogate end point. BACKGROUND:Previous studies revealed that the use o...
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:10.1016/0735-1097(95)00372-x
更新日期:1995-12-01 00:00:00
abstract:OBJECTIVES:We sought to determine if ultrafiltration before intravenous (IV) diuretics in patients with decompensated heart failure and diuretic resistance results in euvolemia and early discharge without hypotension or worsening renal function. BACKGROUND:Heart failure patients with renal insufficiency and diuretic r...
journal_title:Journal of the American College of Cardiology
pub_type: 杂志文章,多中心研究
doi:10.1016/j.jacc.2005.05.099
更新日期:2005-12-06 00:00:00
abstract::The mechanism of electrocardiographic ST segment changes during acute coronary occlusion was evaluated in 28 consecutive patients with single vessel coronary artery disease undergoing coronary angioplasty. Patients were continuously monitored with a six lead electrocardiogram. Twenty-three patients showed ST changes i...
journal_title:Journal of the American College of Cardiology
pub_type: 杂志文章
doi:10.1016/s0735-1097(85)80250-3
更新日期:1985-07-01 00:00:00
abstract:OBJECTIVES:To address the safety and efficacy of drug-eluting stents (DES) in the treatment of intermediate lesions, we performed a pooled analysis of four randomized DES versus bare-metal stent (BMS) trials and assessed outcomes among patients with intermediate lesions. BACKGROUND:Before the introduction of DES, inte...
journal_title:Journal of the American College of Cardiology
pub_type: 杂志文章,meta分析
doi:10.1016/j.jacc.2006.01.068
更新日期:2006-06-06 00:00:00