Document Detail


Left atrial function preserves pulmonary circulatory pressure during pacing-tachycardia and contributes to exercise capacity in patients with idiopathic dilated cardiomyopathy in sinus rhythm, whose exercise is limited by dyspnea.
MedLine Citation:
PMID:  12381089     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The aim of this study was to determine whether left atrial (LA) function contributes to pulmonary circulatory pressure during pacing-tachycardia and exercise capacity in patients with idiopathic dilated cardiomyopathy (DCM). Thirty-two patients with DCM and in sinus rhythm had limited exercise capacity because of dyspnea. The correlation between peak oxygen consumption (VO2) and the variables of cardiac function by cardiac catheterization and 2-dimensional, Doppler echocardiography, and plasma neurohumoral factor levels was tested, as was the correlation between non-invasive LA functional parameters and pulmonary circulatory pressure during pacing-tachycardia. A significant correlation was observed between VO2 and LA dimension (r = -0.45, p < 0.01), the peak velocities of LA appendage empty flow during atrial systole (r = 0.63, p < 0.0001) and the pulmonary venous forward flow in early ventricular systole (PVS1; r = 0.74, p < 0.0001), as well as plasma brain natriuretic peptide (BNP) concentrations. The predictable equation to VO2 with the multiple regression analysis was: VO2 = -0.01 BNP+0.21 PVS1+15.4 (r = 0.81, p < 0.0001). Furthermore, LA functional variables derived from pulmonary venous flow, especially PVS1, but not plasma BNP concentration, were useful for predicting the degree of the increase in pulmonary circulatory pressure during pacing-tachycardia. Therefore, it is suggested that LA function contributes to exercise capacity through its influence on pulmonary hemodynamic reserve in patients with DCM with sinus rhythm whose exercise is limited by dyspnea.
Authors:
Tatsuya Sasaki; Takashi Kubo; Tetsuya Miyamoto; Kazuo Komamura; Kaduo Honda; Tohru Masuyama; Kunio Miyatake
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Circulation journal : official journal of the Japanese Circulation Society     Volume:  66     ISSN:  1346-9843     ISO Abbreviation:  Circ. J.     Publication Date:  2002 Oct 
Date Detail:
Created Date:  2002-10-16     Completed Date:  2003-06-05     Revised Date:  2007-11-15    
Medline Journal Info:
Nlm Unique ID:  101137683     Medline TA:  Circ J     Country:  Japan    
Other Details:
Languages:  eng     Pagination:  937-42     Citation Subset:  IM    
Affiliation:
Department of Cardiology and Cardiovascular Surgery, Osaka Kosei-nenkin Hospital, Osaka, Japan.
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MeSH Terms
Descriptor/Qualifier:
Adult
Aged
Atrial Function, Left / physiology*
Blood Pressure
Cardiomyopathy, Hypertrophic / physiopathology*
Dyspnea / physiopathology
Exercise Test*
Female
Heart Function Tests
Hemodynamics
Humans
Male
Middle Aged
Physical Fitness / physiology
Pulmonary Circulation / physiology*
Pulmonary Wedge Pressure
Regional Blood Flow
Respiratory Function Tests
Tachycardia
Tachycardia, Sinus / physiopathology*

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


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