β-Adrenoceptor stimulation and blockade during myocardial ischemia in dogs: effect on cardiac O2 supply and consumption

G. J. Grover, H. R. Weiss, J. B. Kostis, J. K.J. Li, T. Kovacs, J. Kedem

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8 Scopus citations

Abstract

The effect of β-adrenoceptor blockade and activation on ischemic regional and microregional myocardial O2 supply/consumption parameters was assessed in 28 open chest, anesthetized dogs. Ten minutes after LAD occlusion, dogs were given i.v. saline, 2 mg/kg propranolol, 0.2 mg/kg pindolol, or 1 μg/kg per min isoproterenol. Coronary blood flow was determined using radioactive microspheres before and 2 h after LAD occlusion while O2 supply/consumption parameters were determined using microspectrophotometry. Ischema resulted in a 66% reduction in subendocardial flow in controls in the ischemic zone and no experimental treatment significantly altered this flow. Pindolol resulted in a significant improvement in the ischemic regional subendocardial/subepicardial flow ratio (from 0.69 in the control ischemic region to 0.88 during pindolol treatment). O2 extractions were significantly increased and O2 consumptions were significantly depressed in the ischemic regions of all groups. O2 extractions were increased to a lesser degree in the ischemic region with the use of pindolol and proprandolol. Proprandolol and pindolol both significantly decreased the proportion of veins with low (0-20%) O2 saturations in the ischemic region indicating an improved microregional distribution of blood flow and/or O2 consumption within the ischemic region.

Original languageEnglish (US)
Pages (from-to)103-113
Number of pages11
JournalEuropean Journal of Pharmacology
Volume142
Issue number1
DOIs
StatePublished - Oct 6 1987

All Science Journal Classification (ASJC) codes

  • Pharmacology

Keywords

  • (Dog)
  • Blood flow (coronary)
  • Myocardial ischemia
  • O supply/consumption
  • β-Adrenoceptor blockade

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