Key result
Left sympathetic stimulation decreased systolic flow and increased diastolic flow, whereas right sympathetic stimulation induced marked tachycardia and initially decreased both flows in dogs.
Left and right sympathetic stimulations have distinct physiological effects on phasic coronary flow, driven by differences in contractility, vasoconstriction, and chronotropic responses.
Answers are grounded in this paper and cite their sources.
Animal findings on asymmetric sympathetic coronary effects should not guide practice; leaves open human translation and mechanisms.
In thirteen anesthetized open chest dogs the left sympathetic stimulation decreased the systolic flow by augmented myocardial contractility and by sympathetic coronary vasoconstriction, while the diastolic flow was increased with the elevation of blood pressure. Both systolic and diastolic flows were increased after the stimulation suggesting metabolic vasodilatation. Coronary vasoconstriction and vasodilatation revealed parallel changes in systolic and diastolic flows. The right sympathetic stimulation induced marked tachycardia and decreased systolic and diastolic flows at the initial phase. Both systolic and diastolic flows were increased during the right sympathetic stimulation, indicating less positive inotropic effcet and less remarkable coronary vasoconstriction as well as the marked metabolic response to tachycardia.
No takes yet. Share an insight, caveat, or question.
Kuramoto et al. (1968) studied this question. Left sympathetic stimulation vs. Right sympathetic stimulation was evaluated on Phasic coronary flow (systolic and diastolic flows). Left sympathetic stimulation decreased systolic flow and increased diastolic flow, whereas right sympathetic stimulation induced marked tachycardia and initially decreased both flows in dogs.
Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context: