Document Detail


Dynamic mitral regurgitation. An important determinant of the hemodynamic response to load alterations and inotropic therapy in severe heart failure.
MedLine Citation:
PMID:  2502326     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Cardiac performance and mitral regurgitation were measured by Doppler echocardiography and right heart catheterization in 12 patients with severe congestive heart failure who performed isometric exercise during control and intravenous administration of dobutamine and nitroglycerin. During control isometric exercise, mitral regurgitant volume increased from 18 +/- 13 to 31 +/- 17 ml (p less than 0.01), while forward stroke volume, by both thermodilution and Doppler echocardiography, substantially decreased. At rest, dobutamine decreased mitral regurgitant volume from 18 +/- 13 to 11 +/- 10 ml (p less than 0.05), while forward stroke volume increased from 46 +/- 13 to 55 +/- 15 ml (p less than 0.05). During isometric exercise, dobutamine tended to decrease mitral regurgitant volume (24 +/- 12 vs. 31 +/- 17 ml; NS) when compared with control exercise. At rest, nitroglycerin decreased mitral regurgitant volume from 18 +/- 13 to 11 +/- 11 ml (p less than 0.05), while forward stroke volume, by both thermodilution and Doppler echocardiography, substantially increased. Similarly, during isometric exercise, nitroglycerin decreased mitral regurgitant volume from 31 +/- 17 to 20 +/- 14 ml (p less than 0.05), while significantly increasing forward stroke volume. At control rest, the median mitral regurgitant fraction was 24% for the 12 patients. Neither dobutamine nor nitroglycerin changed significantly forward stroke and mitral regurgitant volumes at rest and during isometric exercise in the six patients with resting mitral regurgitant fraction below the median. In contrast, dobutamine and nitroglycerin significantly decreased mitral regurgitant volume and increased forward stroke volume both at rest and during isometric exercise in the six patients with mitral regurgitant fraction greater than the median.(ABSTRACT TRUNCATED AT 250 WORDS)
Authors:
G Keren; S Katz; J Strom; E H Sonnenblick; T H LeJemtel
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Circulation     Volume:  80     ISSN:  0009-7322     ISO Abbreviation:  Circulation     Publication Date:  1989 Aug 
Date Detail:
Created Date:  1989-09-07     Completed Date:  1989-09-07     Revised Date:  2007-11-15    
Medline Journal Info:
Nlm Unique ID:  0147763     Medline TA:  Circulation     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  306-13     Citation Subset:  AIM; IM    
Affiliation:
Department of Medicine, Albert Einstein College of Medicine, Bronx, NY 10461.
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MeSH Terms
Descriptor/Qualifier:
Aged
Cardiac Output*
Dobutamine / therapeutic use*
Echocardiography, Doppler
Exercise
Female
Heart Catheterization
Heart Failure / complications*,  drug therapy
Humans
Male
Middle Aged
Mitral Valve Insufficiency / complications*
Nitroglycerin / therapeutic use*
Stroke Volume*
Chemical
Reg. No./Substance:
34368-04-2/Dobutamine; 55-63-0/Nitroglycerin

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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