Key result
Carotid baroreceptor stimulation by neck suction significantly reduced bilateral blood flow velocities in the anterior and middle cerebral arteries of healthy individuals.
Why the study?
This study investigated the effects of experimental baroreceptor stimulation on bilateral blood flow velocities in the anterior and middle cerebral arteries.
Does experimental carotid baroreceptor stimulation reduce cerebral blood flow velocities in healthy individuals?
Does experimental carotid baroreceptor stimulation reduce cerebral blood flow velocities in healthy individuals?
p-value: p=0.048
Experimental baroreceptor stimulation reduces cerebral blood flow velocities, challenging the traditional assumption that cerebral autoregulation keeps perfusion completely independent of systemic hemodynamics.
Neck suction reduces ACA/MCA velocities in healthy adults; leaves open any clinical relevance for baroreflex or cerebrovascular modulation.
This study investigated effects of experimental baroreceptor stimulation on bilateral blood flow velocities in the anterior and middle cerebral arteries (ACA and MCA) using functional transcranial Doppler sonography. Carotid baroreceptors were stimulated by neck suction in 33 healthy participants. Therefore, negative pressure (- 50 mmHg) was applied; neck pressure (+ 10 mmHg) was used as a control condition. Heart rate (HR) and blood pressure (BP) were also continuously recorded. Neck suction led to reductions in bilateral ACA and MCA blood flow velocities, which accompanied the expected HR and BP decreases; HR and BP decreases correlated positively with the ACA flow velocity decline. The observations suggest reduction of blood flow in the perfusion territories of the ACA and MCA during baroreceptor stimulation. Baroreceptor-related HR and BP decreases may contribute to the cerebral blood flow decline. The findings underline the interaction between peripheral and cerebral hemodynamic regulation in autoregulatory control of cerebral perfusion.
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Paso et al. (2023) studied Healthy (n=33). Carotid baroreceptor stimulation (neck suction) vs. Neck pressure (+10 mmHg) was evaluated on Blood flow velocities in the anterior and middle cerebral arteries (p=0.048). Carotid baroreceptor stimulation by neck suction significantly reduced bilateral blood flow velocities in the anterior and middle cerebral arteries of healthy individuals.
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