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Effect of tiapamil on canine myocardial infarct size.

Abstract
Limitation of infarct size, using the calcium entry blocker, tiapamil (T), was evaluated in a group of eight dogs during acute and chronic (8 days) myocardial infarction. An equal number of dogs served as the control (C) group. A closed-chest model was used to produce the thrombus by placing a helically-shaped copper wire in the left anterior descending artery (LAD) by catheter technique, under x-ray visualization. Necrotic tissue in serial transventricular sections was delineated by triphenyl tetrazolium chloride and was measured by computer technique, using an IBM-PC interfaced with a digitizing pad, 8 days following occlusion. The mean total amount of necrosis in T animals (9.5%) was significantly less (p less than 0.05) than found in C dogs (19.7%), or a difference of 48% between the two groups. A number of significant (p less than 0.05 to p less than 0.001) between-group comparisons, at the same condition, were found for various hemodynamic, creatine phosphokinase (CPK), and precordial ST segment, Q and QS wave variables followed before and at 1, 3, and 6 hours after occlusion, as well as on the second and eighth day. The results of this study strongly suggest that tiapamil has a protective effect on myocardial function, following thrombotic occlusion of the LAD, as well as limiting the resulting infarct size.
AuthorsK Kordenat, J Leasure
JournalAmerican heart journal (Am Heart J) Vol. 111 Issue 3 Pg. 502-12 (Mar 1986) ISSN: 0002-8703 [Print] United States
PMID3953359 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
Chemical References
  • Calcium Channel Blockers
  • Isoenzymes
  • Propylamines
  • L-Lactate Dehydrogenase
  • Creatine Kinase
  • Tiapamil Hydrochloride
  • Norepinephrine
Topics
  • Animals
  • Calcium Channel Blockers (pharmacology)
  • Creatine Kinase (blood)
  • Disease Models, Animal
  • Dogs
  • Electrocardiography
  • Hemodynamics (drug effects)
  • Isoenzymes (blood)
  • L-Lactate Dehydrogenase (metabolism)
  • Myocardial Infarction (blood, drug therapy, pathology)
  • Myocardium (pathology)
  • Necrosis
  • Norepinephrine (blood)
  • Propylamines (pharmacology)
  • Tiapamil Hydrochloride
  • Time Factors

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