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Interaction between the baroreceptor and Bezold-Jarisch reflexes.

The American Journal of Physiology

|December 1, 1979

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The Bezold-Jarisch (BJ) reflex

Area of Science:

Cardiovascular physiology
Neuroscience

Background:

The Bezold-Jarisch (BJ) reflex and carotid baroreflex are crucial for cardiovascular regulation.
Understanding their interaction is key to comprehending blood pressure and heart rate control.

Purpose of the Study:

To investigate the interplay between the carotid baroreflex and the BJ reflex in anesthetized rabbits.
To determine how varying carotid sinus pressure influences the cardiovascular responses to BJ reflex activation.

Main Methods:

Carotid sinuses were vascularly isolated in rabbits to control intrasinus pressure (ISP).
The BJ reflex was activated using veratridine, and cardiovascular parameters (heart rate, systemic arterial pressure) were monitored.
Aortic nerves were sectioned to isolate the effects of the carotid baroreflex.

Related Experiment Videos

Main Results:

Elevating intrasinus pressure progressively diminished BJ reflex-induced bradycardia and hypotension.
Carotid sinus denervation significantly enhanced BJ reflex effects.
The BJ reflex attenuated the baroreflex sensitivity, with effects inversely proportional to ISP.

Conclusions:

Arterial baroreceptor input modulates BJ reflex responses, with higher pressure reducing BJ reflex effects.
The carotid baroreflex plays a role in buffering BJ reflex-induced cardiovascular changes.
Baroreceptors do not fully compensate for the cardiovascular inhibition caused by the cardiogenic reflex.