Document Detail


Myocardial, skeletal muscle, and renal blood flow during exercise in conscious dogs with heart failure.
MedLine Citation:
PMID:  9374784     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The present study characterizes the hemodynamic and neurohumoral responses to moderate treadmill exercise in conscious dogs with pacing-induced heart failure. Seven dogs were instrumented with a left ventricular micromanometer, ultrasonic crystals for the measurement of systolic wall thickening, left atrial and aortic catheters for the injection of colored microspheres and reference withdrawal, respectively, and ventricular pacing leads with a subcutaneous pacemaker. Dogs were run on a treadmill at a speed of 5 km/h. After control studies, heart failure was induced by rapid left ventricular pacing at 250 beats/min for (mean +/- SD) 23 +/- 6 days. In the control state, cardiac output was increased from 4.5 +/- 1.5 to 7.9 +/- 1.4 l/min (P < 0.05 vs. rest). With heart failure, cardiac output was decreased to 2.5 +/- 0.5 l/min at rest (P < 0.05 vs. control state) and was only 3.0 +/- 0.3 l/min during exercise (P < 0.05 vs. control state; not significant vs. rest). Myocardial and, more so, skeletal muscle blood flows at rest were reduced in heart failure; their increases with exercise were attenuated. An increase in renal blood flow during exercise in the control state was no longer seen in heart failure. Increases in plasma catecholamines and lactate during exercise were more pronounced in heart failure. In conclusion, in heart failure, the increase in cardiac output during exercise was largely attenuated. Increased catecholamine levels may have contributed to splanchnic vasoconstriction and preferential distribution of cardiac output into the working skeletal muscle.
Authors:
T Neumann; G Heusch
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  The American journal of physiology     Volume:  273     ISSN:  0002-9513     ISO Abbreviation:  Am. J. Physiol.     Publication Date:  1997 Nov 
Date Detail:
Created Date:  1997-12-16     Completed Date:  1997-12-16     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  0370511     Medline TA:  Am J Physiol     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  H2452-7     Citation Subset:  IM; S    
Affiliation:
Department of Pathophysiology, University School of Medicine, Essen, Germany.
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MeSH Terms
Descriptor/Qualifier:
Animals
Blood Pressure
Cardiac Output
Coronary Circulation / physiology*
Dogs
Epinephrine / blood
Female
Heart Failure / physiopathology*
Heart Rate
Hemodynamics*
Kidney / blood supply*
Lactates / blood
Male
Muscle, Skeletal / blood supply*
Norepinephrine / blood
Physical Exertion / physiology*
Regional Blood Flow / physiology
Renal Circulation / physiology*
Systole
Ventricular Function, Left
Chemical
Reg. No./Substance:
0/Lactates; 51-41-2/Norepinephrine; 51-43-4/Epinephrine

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


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