Document Detail

Effects of nitrates on R-wave variations after exercise in coronary heart disease: differences in patients with and without angina pectoris.
MedLine Citation:
PMID:  7249756     Owner:  NLM     Status:  MEDLINE    
With the purpose of investigating the pathophysiology of changes in the R wave after exercise and its relationship with left ventricular function, we studied 44 patients with coronary heart disease. They were classified into the following three groups: group A, 11 patients with angina pectoris and no prior myocardial infarction; group B, 18 patients with angina pectoris and prior myocardial infarction; and group C, 15 patients with prior myocardial infarction but no angina. All patients performed two exercise tests; one was a control test, and the other was performed after the sublingual administration of 5 mg of isosorbide dinitrate. In group A, variations in the R-wave voltage in control test and in the test after isosorbide dinitrate were 1.5 +/- 0.8 mm and -1.2 +/- 0.9 mm (P less than 0.05), respectively. In group B, results were 1.2 +/- 0.7 mm on the control test and -0.7 +/- 0.6 mm after isosorbide dinitrate (P less than 0.002), and in group C were -1.6 +/- 1.2 mm on the control test and -0.7 +/- 0.7 mm after isosorbide dinitrate (not significant). Thus, the two groups of patients with angina showed an increase of the R-wave after exercise in the control test but a decrease after the administration of nitrates, whereas the patients without angina showed a reduced R-wave after exercise both before and after the administration of nitrates (like normal subjects). This study suggests that ischemic ventricular dysfunction with exercise results in an increase in the R-wave, while exercise after nitrates results in a decrease in the R-wave consistent with less or no ventricular dysfunction due to nitrate therapy.
J Lerman; E Mele; M Chiozza; H Svetlize; A M Perosio
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Publication Detail:
Type:  Comparative Study; Journal Article    
Journal Detail:
Title:  Chest     Volume:  80     ISSN:  0012-3692     ISO Abbreviation:  Chest     Publication Date:  1981 Aug 
Date Detail:
Created Date:  1981-09-25     Completed Date:  1981-09-25     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0231335     Medline TA:  Chest     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  137-41     Citation Subset:  AIM; IM    
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MeSH Terms
Administration, Topical
Angina Pectoris / physiopathology*
Coronary Disease / physiopathology*
Exercise Test
Heart Ventricles / physiopathology
Isosorbide Dinitrate / administration & dosage*
Middle Aged
Reg. No./Substance:
87-33-2/Isosorbide Dinitrate

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

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