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Titolo:
ACUTE BAROREFLEX RESETTING - DIFFERENTIAL CONTROL OF PRESSURE AND NERVE ACTIVITY
Autore:
DRUMMOND HA; SEAGARD JL;
Indirizzi:
MED COLL WISCONSIN,ZABLOCKI DEP VET AFFAIRS MED CTR MILWAUKEE WI 53226 MED COLL WISCONSIN,DEPT ANESTHESIOL MILWAUKEE WI 53226 MED COLL WISCONSIN,DEPT PHYSIOL MILWAUKEE WI 53226
Titolo Testata:
Hypertension
fascicolo: 3, volume: 27, anno: 1996,
parte:, 1
pagine: 442 - 448
SICI:
0194-911X(1996)27:3<442:ABR-DC>2.0.ZU;2-V
Fonte:
ISI
Lingua:
ENG
Soggetto:
CAROTID-SINUS BARORECEPTORS; RENAL SYMPATHETIC BAROREFLEX; AORTIC BARORECEPTORS; CONSCIOUS RABBITS; CARDIAC AFFERENTS; REFLEX; DOGS; RATS; STIMULATION; COMPONENT;
Keywords:
CAROTID SINUS; SYMPATHETIC NERVE ACTIVITY; THORACIC NERVES; PRESSORECEPTORS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
43
Recensione:
Indirizzi per estratti:
Citazione:
H.A. Drummond e J.L. Seagard, "ACUTE BAROREFLEX RESETTING - DIFFERENTIAL CONTROL OF PRESSURE AND NERVE ACTIVITY", Hypertension, 27(3), 1996, pp. 442-448

Abstract

This study evaluated acute resetting of carotid baroreflex control ofarterial blood pressure and renal or thoracic sympathetic nerve activity in thiopental-anesthetized mongrel dogs with the use of a vascularly isolated carotid sinus preparation, the experimental model used previously to characterize acute resetting in carotid baroreceptor afferent fibers. Carotid baroreceptors were conditioned with a pulsatile pressure for 20 minutes at three pressure ranges: low (50 to 75 mm Hg), mid (100 to 125), or high (150 to 175). Blood pressure and nerve activity were recorded in response to slow ramp increases in sinus pressure;nonlinear regression and best-fit analyses were used for determination of curve fit parameters of the blood pressure and nerve activity versus sinus pressure response curves. Carotid sinus pressure thresholds for blood pressure and renal nerve activity responses at all conditioning pressures were significantly different; however, only the pressurethreshold for thoracic nerve activity at the low conditioning pressure was significantly different from the responses at other conditioningpressures. Average renal activity resetting (0.506+/-0.072) was significantly greater than blood pressure resetting (0.335+/-0.046) in the same dogs, and thoracic activity (0.200+/-0.057) was not different from blood pressure resetting (0.194+/-0.031) in the same dogs. In a previous investigation, our laboratory has demonstrated that type 1 carotid baroreceptors acutely reset at a value of about 0.15. These results indicate that (1) renal and thoracic nerve activities and blood pressure acutely reset to a greater degree than type 1 carotid baroreceptorsand that (2) renal activity acutely resets to a greater degree than blood pressure and thoracic nerve activity.

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Documento generato il 10/07/20 alle ore 19:01:49