ISSN:
1432-2013
Keywords:
Carotid Sinus Reflex
;
Vascular Collaterals
;
Sympathetic Vasoconstrictor Fibers
;
Splanchnic Flow
;
Vertebral Artery
;
Carotissinusreflex
;
Collateralgefäß
;
Sympathische Vasoconstrictoren
;
Splanchnicusdurchblutung
;
Vertebralarterie
Source:
Springer Online Journal Archives 1860-2000
Topics:
Medicine
Notes:
Summary During the carotid occlusion pressor reflex in which elevation of arterial pressure was caused by an increase in total peripheral resistance, the change in local peripheral resistance was compared among various arteries in anesthetized dogs. For the superior mesenteric, femoral and renal arteries, the change in peripheral resistance was below average or at most nearly average. The vascular area which most contributed to the reflex was that in the head and neck supplied by the carotid and vertebral arteries. The conductance (inverse of resistance) change in this area, which unilaterally amounted to about 20% of the total conductance change, was induced by three mechanisms: 1. hemodynamically as a mechanical effect of carotid occlusion, which was however slight due to abundant collaterals, 2. neurally by a sympathetically mediated vasoconstriction especially in the area originally supplied by the occluded carotid arteries, which impeded collateral inflow and contributed to the elevation of systemic pressure, and 3. by autoregulation, which became apparent after the cervical sympathetic nerve had been divided.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00592170
Permalink
