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BioMed Research International
Volume 2014 (2014), Article ID 385082, 9 pages
Research Article

Angiotensin Converting Enzyme Inhibition Reduces Cardiovascular Responses to Acute Stress in Myocardially Infarcted and Chronically Stressed Rats

1Department of Experimental and Clinical Physiology, Medical University of Warsaw, Ulica Pawinskiego 3c, 02-106 Warsaw, Poland
2Department of Internal Medicine and Endocrinology, Medical University of Warsaw, Ulica Banacha 1a, 02-097 Warsaw, Poland

Received 28 February 2014; Revised 29 May 2014; Accepted 1 June 2014; Published 19 June 2014

Academic Editor: Alain Broccard

Copyright © 2014 A. Cudnoch-Jedrzejewska et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Previous studies showed that chronically stressed and myocardially infarcted rats respond with exaggerated cardiovascular responses to acute stress. The present experiments were designed to elucidate whether this effect can be abolished by treatment with the angiotensin converting enzyme (ACE) inhibitor captopril. Sprague Dawley rats were subjected either to sham surgery (Groups 1 and 2) or to myocardial infarction (Groups 3 and 4). The rats of Groups 2 and 4 were also exposed to mild chronic stressing. Four weeks after the operation, mean arterial blood pressure (MABP) and heart rate (HR) were measured under resting conditions and after application of acute stress. The cardiovascular responses to the acute stress were determined again 24 h after administration of captopril orally. Captopril significantly reduced resting MABP in each group. Before administration of captopril, the maximum increases in MABP evoked by the acute stressor in all (infarcted and sham-operated) chronically stressed rats and also in the infarcted nonchronically stressed rats were significantly greater than in the sham-operated rats not exposed to chronic stressing. These differences were abolished by captopril. The results suggest that ACE may improve tolerance of acute stress in heart failure and during chronic stressing.