PMID: 517664Dec 1, 1979Paper

Interaction between the baroreceptor and Bezold-Jarisch reflexes

The American Journal of Physiology
H I Chen

Abstract

The interaction between the carotid baroreflex and Bezold-Jarisch (BJ) reflex (intravenously administered veratridine) was studied in anesthetized rabbits after aortic nerve section. The carotid sinuses were vascularly isolated to regulate the intrasinus pressure (ISP). The extent of BJ reflex bradycardia and hypotension was progressively diminished as the ISP was elevated stepwise. When the carotid baroreflex was not operative by holding the ISP constant at control, the BJ reflex changes in heart rate (HR) and systemic arterial pressure (SAP) were not significantly different from those induced at the normal condition. Thus the calculated baroreflex static loop gain was greatly decreased during the BJ reflex. However, sinus denervation, analogous to keeping ISP below 50 mmHg, significantly enhanced the BJ reflex effects. A steady-state infusion of veratridine remarkably reduced the slope of the baroreflex function ISP-SAP and ISP-HR curves. The results indicate that the BJ reflex effects are affected by the prevailing arterial baroreceptor input, varying inversely with the ISP level. An attenuation in the baroreflex sinsitivity, in terms of the loop gain or slope of the transfer function curve, was observed during the BJ reflex...Continue Reading

Citations

Apr 26, 2003·American Journal of Physiology. Heart and Circulatory Physiology·Koji KashiharaKenji Sunagawa

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