Coronary venous pressure and flow: Effects of vagal stimulation, aortic occlusion, and vasodilators

G. A. Klassen, J. A. Armour

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)

Abstract

Coronary venous pressure and coronary sinus flow in the canine heart were compared with intramyocardial, intraventricular, aortic, and coronary artery pressures. Stimulation of the thoracic vagus augmented coronary venous pressure, mean venous flow per systole, and coronary venous systolic resistance, but decreased the mean venous flow. Partial occlusion of the aorta augmented coronary venous pressure and coronary venous flow, while systolic coronary venous resistance remained unchanged. Adenosine increased peripheral and central coronary venous pressure and venous flow; it reduced peripheral coronary artery pressure. Adenosine augmented flow per systole and reduced venous resistance more than the other interventions. Dipyridamole decreased left ventricular, aortic, and central coronary artery systolic pressures and systolic venous resistance. It increased the venous flow, mean flow per systole, and coronary venous pressure, even though intramyocardial pressure remained unchanged. Nitroglycerine elevated coronary venous pressure and flow, as well as venous flow per systole, even though it decreased left ventricular, aortic, and central coronary artery pressures. Nitroglycerine significantly decreased coronary venous resistance. It is concluded that coronary venous resistance may be an important resistive component to consider when the total coronary circulation is studied.

Original languageEnglish
Pages (from-to)531-538
Number of pages8
JournalCanadian Journal of Physiology and Pharmacology
Volume62
Issue number5
DOIs
Publication statusPublished - 1984

ASJC Scopus Subject Areas

  • Physiology
  • Pharmacology
  • Physiology (medical)

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