Document Detail


Peripheral blood flow responses to exercise after successful correction of coarctation of the aorta.
MedLine Citation:
PMID:  7594109     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
OBJECTIVES: The purpose of this study was to characterize peripheral flow kinetics in response to progressive discontinuous maximal exercise in 10 patients who underwent repair of coarctation of the aorta and 11 age-matched healthy adolescents. BACKGROUND: An impairment of leg blood flow has been suggested on the basis of exaggerated femoral muscle lactate accumulation in patients with successful repair of coarctation. Few data are available describing blood flow kinetics of the exercising leg in such patients. METHODS: Duplex ultrasound provided transcutaneous measurements of peak systolic and end-diastolic flow velocities of the femoral, humeral and renal arteries at rest and immediately after mild, moderate and maximal exercise intensities for computation of mean velocity, resistance index and femoral blood flow. RESULTS: Femoral mean velocity and femoral blood flow increased linearly with exercise intensity in both groups, but the slope of this increase was significantly lower in patients. Similarly, humeral mean velocity increased significantly less in patients than in control subjects. Femoral resistance index sharply decreased from that at rest (patients [mean +/- SE] 1.4 +/- 0.04; control subjects 1.4 +/- 0.03) to mild exercise intensity in both groups (patients 0.69 +/- 0.03; control subjects 0.72 +/- 0.03). A further decrease was observed at maximal exercise in patients (0.60 +/- 0.04, p = 0.08) but not in control subjects (0.69 +/- 0.02). CONCLUSIONS: These observations suggest that despite a greater exercise-induced femoral vasodilation, patients with successful correction of coarctation of the aorta demonstrate an impaired lower limb blood flow in response to strenuous dynamic exercise. In the absence of stenosis at rest, this alteration could result from exaggerated flow turbulence in the descending aorta distal to the site of correction because of loss of elasticity at the site of the resection of the coarcted segment.
Authors:
D Johnson; P Bonnin; H Perrault; T Marchand; S J Vobecky; A Fournier; A Davignon
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of the American College of Cardiology     Volume:  26     ISSN:  0735-1097     ISO Abbreviation:  J. Am. Coll. Cardiol.     Publication Date:  1995 Dec 
Date Detail:
Created Date:  1995-12-28     Completed Date:  1995-12-28     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:  1719-24     Citation Subset:  AIM; IM    
Affiliation:
Cardiology and Cardio-Thoracic Surgery Units, Sainte-Justine Hospital, Montreal, Quebec, Canada.
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MeSH Terms
Descriptor/Qualifier:
Adolescent
Adult
Aortic Coarctation / physiopathology*,  surgery*
Blood Flow Velocity
Blood Pressure
Child
Extremities / blood supply*
Female
Femoral Artery / physiopathology
Heart Rate
Humans
Male
Physical Exertion*
Regional Blood Flow
Renal Artery / physiopathology
Vascular Resistance

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


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