Document Detail


Effects of enhanced external counterpulsation on arterial stiffness and myocardial oxygen demand in patients with chronic angina pectoris.
MedLine Citation:
PMID:  21420062     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Enhanced external counterpulsation (EECP) is a noninvasive technique for treatment of symptomatic coronary artery disease in patients not amenable to revascularization procedures. However, the mechanisms underlying the benefits of EECP remain unknown. We hypothesized that decreases in arterial stiffness and aortic wave reflection are a therapeutic target for EECP. Patients with coronary artery disease and chronic angina pectoris were randomized (2:1 ratio) to 35 1-hour sessions of EECP (n = 28) or sham EECP (n = 14). Central and peripheral arterial pulse-wave velocity and aortic wave reflection (augmentation index) were measured using applanation tonometry before, and after 17 and 35 1-hour treatment sessions. Wasted left ventricular pressure energy and aortic systolic tension-time index, markers of left-ventricular myocardial oxygen demand, were derived from the synthesized aortic pressure wave. Exercise duration, anginal threshold, and peak oxygen consumption were measured using a graded treadmill test. Central arterial stiffness and augmentation index were decreased after 17 and 35 sessions in the treatment group. Measurements of peripheral arterial stiffness were decreased after 35 sessions in the treatment group. Changes in aortic pressure wave reflection resulted in decreased measurements of myocardial oxygen demand and wasted left ventricular energy. No changes in central or peripheral arterial stiffness were observed in the sham group. Furthermore, measurements of exercise capacity were improved in the EECP group but unchanged in the sham group. In conclusion, EECP therapy decreases central and peripheral arterial stiffness, which may explain improvements in myocardial oxygen demand in patients with chronic angina pectoris after treatment.
Authors:
Darren P Casey; Darren T Beck; Wilmer W Nichols; C Richard Conti; Calvin Y Choi; Matheen A Khuddus; Randy W Braith
Publication Detail:
Type:  Journal Article; Randomized Controlled Trial; Research Support, N.I.H., Extramural     Date:  2011-03-17
Journal Detail:
Title:  The American journal of cardiology     Volume:  107     ISSN:  1879-1913     ISO Abbreviation:  Am. J. Cardiol.     Publication Date:  2011 May 
Date Detail:
Created Date:  2011-05-04     Completed Date:  2011-06-30     Revised Date:  2013-06-30    
Medline Journal Info:
Nlm Unique ID:  0207277     Medline TA:  Am J Cardiol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1466-72     Citation Subset:  AIM; IM    
Copyright Information:
Copyright © 2011 Elsevier Inc. All rights reserved.
Affiliation:
Department of Anesthesiology, Mayo Clinic, Rochester, Minnesota, USA.
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MeSH Terms
Descriptor/Qualifier:
Angina Pectoris / physiopathology,  therapy*
Arteries / physiology,  physiopathology
Chronic Disease
Counterpulsation / methods*
Female
Humans
Male
Middle Aged
Myocardium / metabolism*
Oxygen / metabolism*
Grant Support
ID/Acronym/Agency:
R01 HL077571-01/HL/NHLBI NIH HHS; R01 HL077571-01/HL/NHLBI NIH HHS
Chemical
Reg. No./Substance:
7782-44-7/Oxygen
Comments/Corrections

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


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