Abstract:
:The maximal exercise capacity of cardiac transplant recipients is reduced compared with that of normal subjects. To determine if this reduced exercise capacity is related to inadequate myocardial perfusion during exercise, myocardial perfusion was measured noninvasively with use of positron emission tomography and nitrogen (N)-13 ammonia. Twelve transplant recipients with no angiographic evidence of accelerated coronary atherosclerosis were studied. Serial N-13 ammonia imaging was performed at rest and during supine bicycle exercise. The results were compared with those from 10 normal volunteers with a low probability of having cardiac disease. A two-compartment kinetic model for estimating myocardial perfusion was applied to the data. Transplant recipients achieved a significant lower exercise work load than did the volunteers (42 +/- 16 vs. 128 +/- 22 W), but a higher venous lactate concentration (31.3 +/- 14.9 vs. 13.7 +/- 4.1 mg/100 ml). Despite the difference in exercise work load, there was no significant difference in the cardiac work achieved by transplant recipients and normal subjects as evidenced by similar rate-pressure products of 24,000 +/- 3,400 versus 21,300 +/- 2,800 betas/min per mm Hg, respectively. In addition, myocardial blood flow during exercise was not significantly different between the two groups (1.70 +/- 0.60 vs. 1.56 +/- 0.71 ml/min per g, respectively). This study demonstrates that the myocardial flow response to the physiologic stress of exercise is appropriate in transplant recipients and does not appear to explain the decreased exercise capacity in these patients.
journal_name
J Am Coll Cardioljournal_title
Journal of the American College of Cardiologyauthors
Krivokapich J,Stevenson LW,Kobashigawa J,Huang SC,Schelbert HRdoi
10.1016/0735-1097(91)90608-csubject
Has Abstractpub_date
1991-08-01 00:00:00pages
512-7issue
2eissn
0735-1097issn
1558-3597pii
0735-1097(91)90608-Cjournal_volume
18pub_type
杂志文章abstract:OBJECTIVES:the purpose of this study was to evaluate the association of the percentage of platelet inhibitory response to clopidogrel as assessed by modified thromboelastography with bleeding and transfusion requirement after off-pump coronary artery bypass graft (OPCABG) surgery. BACKGROUND:Interindividual variabilit...
journal_title:Journal of the American College of Cardiology
pub_type: 临床试验,杂志文章
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更新日期:2010-12-07 00:00:00
abstract::The patient with heart disease and the physician providing cardiovascular health care have experienced dramatic change since the American College of Cardiology first published its journal 25 years ago. During the decade before 1958, cardiology and cardiovascular surgery emerged as specialties. Surgery by closed techni...
journal_title:Journal of the American College of Cardiology
pub_type: 历史文章,杂志文章
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更新日期:1983-01-01 00:00:00
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doi:10.1016/0735-1097(95)00167-x
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pub_type: 杂志文章
doi:10.1016/s0735-1097(87)80467-9
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更新日期:2011-02-22 00:00:00
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pub_type: 杂志文章
doi:10.1016/s0735-1097(87)80237-1
更新日期:1987-04-01 00:00:00
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更新日期:2017-05-09 00:00:00
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更新日期:2003-06-18 00:00:00
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更新日期:1992-02-01 00:00:00
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更新日期:2010-04-27 00:00:00
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pub_type: 临床试验,杂志文章,多中心研究
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更新日期:1993-11-01 00:00:00
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pub_type: 杂志文章
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更新日期:1993-01-01 00:00:00
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doi:10.1016/s0735-1097(98)00627-5
更新日期:1999-03-01 00:00:00
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pub_type: 杂志文章
doi:10.1016/s0735-1097(02)02820-6
更新日期:2003-02-05 00:00:00
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doi:10.1016/j.jacc.2013.04.027
更新日期:2013-07-09 00:00:00
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更新日期:2002-03-06 00:00:00
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更新日期:2011-11-22 00:00:00
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pub_type: 杂志文章,随机对照试验
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更新日期:2014-10-21 00:00:00
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pub_type: 杂志文章
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更新日期:1994-04-01 00:00:00
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更新日期:2015-12-08 00:00:00
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pub_type: 临床试验,杂志文章,多中心研究
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更新日期:2015-04-21 00:00:00
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更新日期:2017-11-14 00:00:00
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更新日期:2008-06-17 00:00:00
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更新日期:2009-01-06 00:00:00
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更新日期:2003-06-04 00:00:00