Coronary Vasodilatation and Adrenergic Receptors in the Dog Heart and Coronary

Open Access
Publisher Website
Google Scholar
Abstract
The question of whether the coronary blood vessels contain an intrinsic adrenergic mechanism for vasodilatation of physiological significance was examined in the canine heart-lung preparation with a donor by studying the response of the coronary vessels to epinephrine, norepinephrine, isoproterenol and salbutamol in combination with practolol. To differentiate the vasodilatation mediated through adrenoceptors in the coronary vessels from that resulting from an increase in the myocardial O2 consumption, a special method of analysis was developed based on the linear relation between the coronary flow and the myocardial O2 consumption. All 4 compounds produced an increase in the coronary flow attributable to an increased myocardial O2 consumption. Epinephrine and norepinephrine produced a decrease in the coronary flow after practolol which completely abolished the increase in the myocardial O2 consumption as well as the positive inotropic and chronotropic effects produced by these compounds, while isoproterenol and salbutamol produced an increase. Adrenergic .beta.-receptor exists in the coronary subserving a vasodilatation. The vasodilatation through this mechanism is of minor importance under physiological conditions and becomes completely masked in the presence of an overwhelmingly strong vasodilatation consequent to an increase in the myocardial O2 consumption.