Abstract:
OBJECTIVES:The aim of this study was to characterize fully in vivo aortic compliance over a wide range of passive distending pressures, and to study pharmacologically induced alterations in compliance using an intravascular ultrasound-based technique in the canine model of heart failure. BACKGROUND:Altered aortic compliance may influence considerably the function of the failing heart. Although some studies demonstrate that patients with heart failure have decreased aortic compliance, data from other studies are conflicting. METHODS:Aortic pressures and dimensions in seven dogs were determined both before and after pacing-induced congestive heart failure (CHF) using simultaneous micromanometer and intravascular ultrasound transducers. Decreases in aortic pressure were produced at baseline and after nitroprusside and dobutamine infusions. Inner and outer aortic circumferences were drawn at the lumen-intimal and media-adventitial borders. RESULTS:Aortic pressure-dimension (chamber) stiffness constants were greater after heart failure was produced (10.0+/-1.5 vs. 6.7+/-1.5, p < 0.05), but stress-strain stiffness (material) constants were similar (11.4+/-1.8 vs. 11.3+/-1.0, p=NS). Equivasodilating doses of nitroprusside and 10 microg/kg/min dobutamine decreased pressure-dimension stiffness constants after pacing-induced heart failure but not beforehand. The aortic wall thickness to diameter ratio was significantly greater in CHF than in the control condition (0.30+/-0.08 vs. 0.16+/-0.03, p < 0.01). CONCLUSIONS:Aortic compliance is decreased in this model of CHF, and this change is attributable primarily to vessel geometry rather than material properties. Equivasodilating doses of nitroprusside and equivalent doses of dobutamine increase aortic chamber compliance in dogs with CHF, but not in normal dogs. These data suggest that the beneficial effects of nitroprusside and dobutamine in CHF occur in part from improvement in aortic compliance.
journal_name
J Am Coll Cardioljournal_title
Journal of the American College of Cardiologyauthors
Khan Z,Millard RW,Gabel M,Walsh RA,Hoit BDdoi
10.1016/s0735-1097(98)00530-0subject
Has Abstractpub_date
1999-01-01 00:00:00pages
267-72issue
1eissn
0735-1097issn
1558-3597pii
S0735-1097(98)00530-0journal_volume
33pub_type
杂志文章abstract::Streptokinase and urokinase have proved to be useful in a limited number of clinical conditions. Mainly because of the risk and unpredictability of bleeding with this first generation of thrombolytic agents, thrombolysis has not been ingrained in medical practice. In the interim, more fibrin-specific thrombolytic agen...
journal_title:Journal of the American College of Cardiology
pub_type: 杂志文章,评审
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pub_type: 杂志文章,评审
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journal_title:Journal of the American College of Cardiology
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更新日期:2014-05-20 00:00:00
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pub_type: 杂志文章
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journal_title:Journal of the American College of Cardiology
pub_type: 杂志文章
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更新日期:1984-06-01 00:00:00
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更新日期:2005-04-05 00:00:00
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更新日期:1985-08-01 00:00:00