Comparative study on the enhancement of ischemic tolerance by intracoronary pretreatment with three calcium antagonists in pig hearts

Cardiovascular Drugs and Therapy
H H KleinH Kreuzer

Abstract

The effect of intracoronary (IC) pretreatment with different calcium antagonists (diltiazem, nifedipine, verapamil) on the development of infarcts was investigated in two experimental series including 35 open-chest pigs. The left anterior descending coronary artery (LAD) was distally ligated for 75 minutes (series A) or for 45 minutes (series B) and was reperfused for 24 hours. Infarct size was determined as the ratio of infarcted myocardium (tetrazolium stain) to the risk region (dye technique). In series A, 20 pigs were pretreated immediately before occlusion with either IC diltiazem (n = 5, 4 mg/2 min), IC nifedipine (n = 5, 0.4 mg/2 min), IC verapamil (n = 5, 1 mg/2 min), or isotonic sodium chloride solution (n = 5). In series B, IC diltiazem (n = 5, 4 mg/2 min), IC verapamil (n = 5, 1 mg/2 min), or isotonic saline solution (n = 5) were administered 8 minutes prior to ischemia. The IC infusion of all calcium antagonists (series A) depressed left ventricular peak pressure, diastolic blood pressure, and dp/dt max and increased heart rate and coronary venous oxygen saturation. The development of infarcts was significantly delayed by IC diltiazem and IC verapamil. Mean infarct sizes (series A) amounted to 62% in the diltiazem g...Continue Reading

References

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Citations

Nov 28, 2002·Catheterization and Cardiovascular Interventions : Official Journal of the Society for Cardiac Angiography & Interventions·Gerald S WernerHans R Figulla
Sep 28, 2002·Journal of Cardiovascular Pharmacology·Andrey V GourinePer-Ove Sjöquist
Aug 1, 1997·Journal of Cardiovascular Pharmacology·H H KleinK Nebendahl

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