Document Detail


Observations suggesting a high incidence of exercise-induced severe mitral regurgitation in patients with mild rheumatic mitral valve disease at rest.
MedLine Citation:
PMID:  7798489     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
OBJECTIVES: The aim of this study was to determine the hemodynamic effects of upright bicycle ergometry in symptomatic patients with mild, mixed mitral stenosis and regurgitation. BACKGROUND: Patients with seemingly mild rheumatic mitral valve disease often complain of exertional dyspnea or fatigue. These symptoms are usually ascribed to flow-dependent increases in the gradient across the stenotic mitral valve. Although catheterization studies in these patients may demonstrate an increase in mitral valve gradient proportional to an increase in cardiac output, this approach does not specifically address the underlying mechanism of any observed increases in mitral gradient or left atrial (i.e., pulmonary capillary wedge) pressure. Exercise echocardiography is uniquely suited to the dynamic assessment of exercise-induced hemodynamic changes. METHODS: Fourteen symptomatic patients with exertional dyspnea and mild mitral stenosis and regurgitation at rest performed symptom-limited upright bicycle ergometry with quantitative two-dimensional, Doppler and color Doppler echocardiographic analysis. RESULTS: Average pulmonary artery systolic pressure in the 13 patients with adequate spectral signals of tricuspid regurgitation increased from 36 +/- 5 mm Hg (mean +/- SD) at rest to 63 +/- 14 mm Hg at peak exercise (p < 0.001). The mean transmitral pressure gradient in all patients increased from 4.5 +/- 1.4 mm Hg at rest to 12.7 +/- 2.7 mm Hg at peak exercise (p < 0.001). Five patients developed severe mitral regurgitation during exercise. CONCLUSIONS: Patients with exertional dyspnea and mild mitral stenosis and regurgitation at rest demonstrate a marked increase in pulmonary artery systolic pressure and mean transmitral pressure gradient during dynamic exercise. In a subset of these patients, marked worsening of mitral regurgitation appears to be the underlying mechanism of this hemodynamic deterioration. Because of the small sample size, this novel observation must be considered preliminary with respect to the true prevalence of exercise-related development of severe mitral regurgitation. If additional studies confirm the importance of this phenomenon, it has important implications for the management of patients with rheumatic mitral valve disease.
Authors:
M D Tischler; R W Battle; M Saha; J Niggel; M M LeWinter
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Publication Detail:
Type:  Comparative Study; Journal Article    
Journal Detail:
Title:  Journal of the American College of Cardiology     Volume:  25     ISSN:  0735-1097     ISO Abbreviation:  J. Am. Coll. Cardiol.     Publication Date:  1995 Jan 
Date Detail:
Created Date:  1995-01-25     Completed Date:  1995-01-25     Revised Date:  2010-03-24    
Medline Journal Info:
Nlm Unique ID:  8301365     Medline TA:  J Am Coll Cardiol     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  128-33     Citation Subset:  AIM; IM    
Affiliation:
Cardiology Unit, Medical Center Hospital of Vermont, Burlington 05401.
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MeSH Terms
Descriptor/Qualifier:
Adult
Aged
Echocardiography / instrumentation,  methods,  statistics & numerical data
Exercise / physiology*
Exercise Test / instrumentation,  methods,  statistics & numerical data
Female
Humans
Incidence
Male
Middle Aged
Mitral Valve Insufficiency / diagnosis*,  epidemiology,  etiology,  physiopathology
Mitral Valve Stenosis / complications,  diagnosis*,  physiopathology
Rest / physiology
Rheumatic Heart Disease / complications,  diagnosis*,  physiopathology
Systole
Ventricular Function, Left

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


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