Document Detail


Right-ventricular contractility in chronic obstructive pulmonary disease: a combined radionuclide and hemodynamic study.
MedLine Citation:
PMID:  3387685     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The effect of pulmonary artery hypertension on right-ventricular performance in patients with chronic obstructive pulmonary disease (COPD) is unclear. Decreased values of right-ventricular ejection fraction (RVEF) have been reported, but most patients with stable COPD are not in cardiac failure and have normal or even increased cardiac outputs. We therefore hypothesized that RVEF may be afterload dependent, and thus a poor parameter of cardiac function, and that right-ventricular contractility may be normal even in COPD patients with pulmonary hypertension. We therefore studied 24 COPD patients using a combined hemodynamic and radionuclide approach. RVEF and thermodilution stroke volume index were measured simultaneously at rest in all 24 patients and also during bicycle ergometry in 9 patients. We then calculated end-diastolic and end-systolic volume indices and derived right-ventricular systolic pressure-volume relations in all and the slopes (E) of the pressure-volume line in 9 patients. RVEF was normal in COPD patients without pulmonary hypertension, but was reduced in those with pulmonary hypertension. A strong inverse linear relation between RVEF and mean pulmonary artery pressure (r = -0.73; p less than 0.001) and pulmonary vascular resistance (r = -0.69; p less than 0.001) could be demonstrated, indicating RVEF to be highly afterload dependent. Right-ventricular end-diastolic volume index was significantly higher in patients with pulmonary hypertension, indicating increased preload as the major mechanism to maintain adequate stroke volume in the face of an increased afterload. Right-ventricular end-systolic pressure-volume relations, a good parameter to define right-ventricular contractility independent of systolic loading conditions, were not different between COPD patients with or without pulmonary hypertension, nor did the slopes of the pressure-volume lines in the 9 patients studied during exercise show any difference. From these data we conclude that (a) RVEF is a poor indicator of overall right-ventricular function; (b) right-ventricular contractility is well preserved in stable COPD patients; (c) the major mechanism of maintaining stroke volume in the face of increased right-ventricular afterload seems to be preload augmentation.
Authors:
O C Burghuber; H Bergmann
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Respiration; international review of thoracic diseases     Volume:  53     ISSN:  0025-7931     ISO Abbreviation:  Respiration     Publication Date:  1988  
Date Detail:
Created Date:  1988-08-09     Completed Date:  1988-08-09     Revised Date:  2009-11-11    
Medline Journal Info:
Nlm Unique ID:  0137356     Medline TA:  Respiration     Country:  SWITZERLAND    
Other Details:
Languages:  eng     Pagination:  1-12     Citation Subset:  IM    
Affiliation:
2nd Medical Department, University of Vienna, Austria.
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MeSH Terms
Descriptor/Qualifier:
Blood Pressure
Humans
Hypertension, Pulmonary / physiopathology
Krypton Radioisotopes / diagnostic use
Lung Diseases, Obstructive / physiopathology*,  radionuclide imaging
Male
Myocardial Contraction*
Physical Exertion
Pulmonary Wedge Pressure
Stroke Volume
Thermodilution
Ventricular Function
Chemical
Reg. No./Substance:
0/Krypton Radioisotopes

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


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