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Titolo:
EXCITATION OF BARORECEPTORS DEPRESSES A-COMPONENT AND C-COMPONENT OF THE SOMATO-CARDIAC SYMPATHETIC REFLEX IN ANESTHETIZED RATS
Autore:
LI WM; LIU X; KUMADA M; SATO A;
Indirizzi:
TOKYO METROPOLITAN INST GERONTOL,DEPT AUTON NERVOUS SYST,ITABASHI KU,35-2 SAKAE CHO TOKYO 1730015 JAPAN TOKYO METROPOLITAN INST GERONTOL,DEPT AUTON NERVOUS SYST,ITABASHI KU TOKYO 1730015 JAPAN UNIV TOKYO,FAC MED,DEPT CELLULAR & MOL PHYSIOL TOKYO 1130033 JAPAN SHANGHAI MED UNIV 2,RUI JIN HOSP,DEPT CARDIOL SHANGHAI 200025 PEOPLESR CHINA ST LUKES COLL NURSING,DIV BASIC MED SCI TOKYO 1040044 JAPAN
Titolo Testata:
Japanese Journal of Physiology
fascicolo: 4, volume: 48, anno: 1998,
pagine: 261 - 266
SICI:
0021-521X(1998)48:4<261:EOBDAA>2.0.ZU;2-L
Fonte:
ISI
Lingua:
ENG
Soggetto:
A-REFLEX; DISCHARGES; NERVE;
Keywords:
SOMATIC AFFERENT; CARDIAC SYMPATHETIC NERVE; SOMATO-SYMPATHETIC REFLEX; ARTERIAL BARORECEPTORS; ANESTHETIZED RATS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
18
Recensione:
Indirizzi per estratti:
Citazione:
W.M. Li et al., "EXCITATION OF BARORECEPTORS DEPRESSES A-COMPONENT AND C-COMPONENT OF THE SOMATO-CARDIAC SYMPATHETIC REFLEX IN ANESTHETIZED RATS", Japanese Journal of Physiology, 48(4), 1998, pp. 261-266

Abstract

The effect of baroreceptor activation on somato-cardiac sympathetic reflex discharges was examined in urethane-anesthetized, vagotomized, and artificially ventilated rats. Single shock stimulation of myelinated (A) and unmyelinated (C) fibers in the tibial nerve of the left hindlimb elicited two separate excitatory reflex discharge components in abranch of the cardiac sympathetic nerve, They are termed the A- and C-components of the somato-cardiac sympathetic reflex discharges. When aortic nerves (AN) and carotid sinus nerves (CSN) were intact, a sudden increase in mean arterial blood pressure to about 150 mmHg induced by i.v. injection of phenylephrine (50 mu g/kg) depressed the A- and C-components by up to 47 +/- 5.4 and 37 +/- 7.7% of the control values, respectively. However, bilateral sine-aortic denervation completely abolished the pressure-induced depression of both components. We conclude that baroreceptor afferent signals from the AN and CSN inhibit both A- and C-components of the excitatory somato-cardiac sympathetic reflex discharges. This and other previous evidence mentioned in the text indicate that inhibitory cardiac sympathetic reflexes originating from arterial baroreceptors and excitatory ones originating from somatic afferents interact, probably at the brainstem.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 02/12/20 alle ore 14:43:43