Abstract:
:The slope and pressure half-time of the aortic regurgitant velocity spectrum have been used as non-invasive markers of regurgitant severity. Recent in vitro and theoretical work, however, has suggested a confounding effect of systemic vascular resistance and left ventricular compliance on these parameters. To study this situation in vivo, we have investigated the determinants of the aortic regurgitant velocity profile in an animal model of aortic regurgitation in which the regurgitation was induced surgically and in which the afterload was varied pharmacologically. Specifically, we examined the relationship of slope and pressure half-time of the aortic regurgitant velocity profile to the severity of aortic regurgitation under varying conditions of afterload using multilinear analysis. Slope varied directly with regurgitant orifice area and inversely with systemic vascular resistance and both left ventricular and aortic compliance (all P < 0.001). Pressure half-time related to these variables in the opposite direction. When the regurgitant orifice was variable in size, slope related directly (P < 0.001) and half-time inversely to the severity of the aortic regurgitation (the clinically expected response). In contrast, when the regurgitant orifice area was constant, slope varied inversely (P < 0.001) and half-time varied directly (P < 0.07) with the severity of the aortic regurgitation. Following nitroprusside infusion, slope tended to increase (P = 0.08) and pressure half-time tended to shorten (P = 0.08) despite a significant reduction in the regurgitant fraction (P = 0.009). Similarly, following dopamine infusion, a significant increase in regurgitant fraction (P = 0.01) was associated with a slight fall in aortic regurgitation slope and a lengthening of the half-time.(ABSTRACT TRUNCATED AT 250 WORDS)
journal_name
Eur Heart Jjournal_title
European heart journalauthors
Griffin BP,Flachskampf FA,Reimold SC,Lee RT,Thomas JDdoi
10.1093/oxfordjournals.eurheartj.a060567subject
Has Abstractpub_date
1994-05-01 00:00:00pages
681-5issue
5eissn
0195-668Xissn
1522-9645journal_volume
15pub_type
杂志文章abstract::In a prospective study, an elderly group of patients (n = 63, 47 male, 16 female, age 40-65 years) was examined before and after open-heart surgery under cardiopulmonary bypass: postoperatively, 19 patients (30%) showed no clinical neuropsychiatric symptoms, whereas in 35 patients (56%) mild or transient neurological ...
journal_title:European heart journal
pub_type: 杂志文章
doi:10.1093/eurheartj/14.7.885
更新日期:1993-07-01 00:00:00
abstract:AIMS:Large randomized trials have shown that beta-blockers reduce mortality and hospital admissions in patients with heart failure. The effects of beta-blockers in elderly patients with a broad range of left ventricular ejection fraction are uncertain. The SENIORS study was performed to assess effects of the beta-block...
journal_title:European heart journal
pub_type: 临床试验,杂志文章,多中心研究,随机对照试验
doi:10.1093/eurheartj/ehi115
更新日期:2005-02-01 00:00:00
abstract:AIMS:The object of this study is to analyse the trends in coronary events in Finland during 1993-2002, correcting for the effect of troponins. METHODS AND RESULTS:A population-based myocardial infarction register recorded all coronary events (n=14 782) in four geographical areas of Finland during 1993-2002. Correction...
journal_title:European heart journal
pub_type: 杂志文章,多中心研究
doi:10.1093/eurheartj/ehl120
更新日期:2006-10-01 00:00:00
abstract::The incidence of cardiogenic shock (CS) has increased remarkably over the past decade and remains a challenging condition with mortality rates of ∼50%. Cardiogenic shock encompasses cardiac contractile dysfunction; however, it is also a multiorgan dysfunction syndrome, often complicated by a systemic inflammatory resp...
journal_title:European heart journal
pub_type: 杂志文章
doi:10.1093/eurheartj/ehz783
更新日期:2020-10-14 00:00:00
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journal_title:European heart journal
pub_type: 杂志文章,多中心研究,随机对照试验
doi:10.1093/eurheartj/ehi327
更新日期:2005-10-01 00:00:00
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journal_title:European heart journal
pub_type: 杂志文章,评审
doi:10.1093/eurheartj/ehr160
更新日期:2011-10-01 00:00:00
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journal_title:European heart journal
pub_type: 临床试验,杂志文章,随机对照试验
doi:10.1053/euhj.1998.1098
更新日期:1999-01-01 00:00:00
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journal_title:European heart journal
pub_type: 临床试验,杂志文章,多中心研究
doi:10.1093/eurheartj/ehv690
更新日期:2016-04-14 00:00:00
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journal_title:European heart journal
pub_type: 杂志文章,评审
doi:10.1093/oxfordjournals.eurheartj.a060237
更新日期:1992-05-01 00:00:00
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journal_title:European heart journal
pub_type: 杂志文章
doi:10.1093/oxfordjournals.eurheartj.a061703
更新日期:1984-07-01 00:00:00
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journal_title:European heart journal
pub_type: 杂志文章
doi:10.1093/oxfordjournals.eurheartj.a059744
更新日期:1990-06-01 00:00:00
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journal_title:European heart journal
pub_type: 杂志文章,评审
doi:10.1093/eurheartj/ehw069
更新日期:2017-03-21 00:00:00
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journal_title:European heart journal
pub_type: 杂志文章
doi:10.1053/euhj.2001.3034
更新日期:2002-06-01 00:00:00
abstract:Aims:Pulmonary hypertension (PH) and pulmonary vascular disease (PVD) are common and associated with adverse outcomes in heart failure with preserved ejection fraction (HFpEF). Little is known about the impact of PVD on the pathophysiology of exercise intolerance. Methods and results:Heart failure with preserved eject...
journal_title:European heart journal
pub_type: 杂志文章
doi:10.1093/eurheartj/ehy331
更新日期:2018-08-07 00:00:00
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pub_type: 杂志文章,随机对照试验
doi:10.1093/eurheartj/ehn486
更新日期:2009-01-01 00:00:00
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journal_title:European heart journal
pub_type: 杂志文章
doi:10.1093/eurheartj/5.suppl_e.97
更新日期:1984-11-01 00:00:00
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journal_title:European heart journal
pub_type: 杂志文章
doi:10.1093/oxfordjournals.eurheartj.a061885
更新日期:1985-05-01 00:00:00
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journal_title:European heart journal
pub_type: 杂志文章
doi:10.1093/eurheartj/5.suppl_c.133
更新日期:1984-10-01 00:00:00
abstract::Cardiac output was measured in 11 patients undergoing routine cardiac catheterization using a carbon dioxide rebreathing technique and compared with cardiac output measured by direct Fick and thermodilution. The carbon dioxide rebreathing technique gave consistently lower values for cardiac output than the other two m...
journal_title:European heart journal
pub_type: 杂志文章
doi:10.1093/oxfordjournals.eurheartj.a060504
更新日期:1994-03-01 00:00:00
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pub_type: 杂志文章
doi:10.1093/oxfordjournals.eurheartj.a015273
更新日期:1997-03-01 00:00:00
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journal_title:European heart journal
pub_type: 临床试验,杂志文章,随机对照试验
doi:10.1093/eurheartj/ehi186
更新日期:2005-05-01 00:00:00
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journal_title:European heart journal
pub_type: 杂志文章,评审
doi:
更新日期:1998-02-01 00:00:00
abstract::Between January 1983 and December 1990, 20 patients aged 80 years or older underwent valvular surgery. The patients' ages varied from 80 to 87 years (mean, 82 +/- 1.5 years). The indication for operation was aortic stenosis in 19 patients, and mitral insufficiency after previous mitral valve replacement with a biopros...
journal_title:European heart journal
pub_type: 杂志文章
doi:10.1093/oxfordjournals.eurheartj.a060205
更新日期:1992-04-01 00:00:00
abstract::Cardiac troponins (cTns) I and T have long been the most successful cardiac-specific circulating biomarkers in cardiovascular (CV) medicine, having changed dramatically the diagnosis of acute myocardial infarction, while being independent predictors of outcome in several cardiac conditions and non-cardiac conditions. ...
journal_title:European heart journal
pub_type: 杂志文章
doi:10.1093/eurheartj/ehaa083
更新日期:2020-11-01 00:00:00
abstract::Severe primary mitral regurgitation (MR) has a poor outcome if left uncorrected. Successful mitral valve repair has the unique potential to restore normal life expectancy and is superior to valve replacement. Despite this, mitral repair is performed relatively infrequently and many patients with potentially reparable ...
journal_title:European heart journal
pub_type: 杂志文章,评审
doi:10.1093/eurheartj/ehl381
更新日期:2006-12-01 00:00:00
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journal_title:European heart journal
pub_type: 杂志文章,评审
doi:10.1093/eurheartj/14.suppl_e.2
更新日期:1993-09-01 00:00:00
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pub_type: 杂志文章
doi:10.1093/eurheartj/ehl360
更新日期:2006-12-01 00:00:00
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journal_title:European heart journal
pub_type: 杂志文章
doi:10.1016/s0195-668x(03)00113-1
更新日期:2003-06-01 00:00:00
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journal_title:European heart journal
pub_type: 杂志文章
doi:10.1053/euhj.1998.1332
更新日期:1999-03-01 00:00:00
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journal_title:European heart journal
pub_type: 杂志文章
doi:10.1093/oxfordjournals.eurheartj.a062036
更新日期:1986-02-01 00:00:00