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Titolo:
HEMODYNAMIC ANALYSIS OF ARTERIAL-PRESSURE OSCILLATIONS IN CONSCIOUS RATS
Autore:
JULIEN C; ZHANG ZQ; CERUTTI C; BARRES C;
Indirizzi:
CNRS,FAC PHARM,DEPT PHYSIOL & PHARMACOL CLIN,URA 1483,8 AVE ROCKFELLER F-69373 LYON 08 FRANCE
Titolo Testata:
Journal of the autonomic nervous system
fascicolo: 3, volume: 50, anno: 1995,
pagine: 239 - 252
SICI:
0165-1838(1995)50:3<239:HAOAOI>2.0.ZU;2-3
Fonte:
ISI
Lingua:
ENG
Soggetto:
SYMPATHETIC-NERVE ACTIVITY; RENAL BLOOD-FLOW; SPECTRAL-ANALYSIS; HEART-RATE; SINOAORTIC DEAFFERENTATION; CARDIOVASCULAR VARIABILITY; POWER SPECTRUM; PULSE-INTERVAL; R-R; LABILITY;
Keywords:
ARTERIAL PRESSURE VARIABILITY; REGIONAL HEMODYNAMICS; SINOAORTIC DENERVATION; SPECTRAL ANALYSIS; SYMPATHECTOMY;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
38
Recensione:
Indirizzi per estratti:
Citazione:
C. Julien et al., "HEMODYNAMIC ANALYSIS OF ARTERIAL-PRESSURE OSCILLATIONS IN CONSCIOUS RATS", Journal of the autonomic nervous system, 50(3), 1995, pp. 239-252

Abstract

This study examined the contribution of rhythmic fluctuations of regional blood flow and vascular conductance to the genesis of low- (LF, 0.27-0.74 Hz) and high- (HF, 0.76-5 Hz) frequency oscillations of arterial pressure. In conscious 15-week-old male intact (n = 11), guanethidine-sympathectomized (n = 8) and chronically sinoaortic denervated (n = 7) rats, arterial pressure and regional blood flow velocities (pulsed Doppler probes) were simultaneously recorded. Indices of subdiaphragmatic aortic, hindquarters and superior mesenteric conductances were calculated on a beat-to-beat basis over a 60-min period. Spectral powerwas calculated in the LF and HF bands using a fast Fourier transform algorithm. Transfer function analysis was also performed to calculate coherence and phase between arterial pressure and regional flows and conductances. In the LF band, spectral power of arterial pressure was decreased by approx. 85% in sympathectomized and approx. 54% in sinoaortic denervated rats. In the HF band, spectral power did not differ between the groups. In the three groups of rats, relations between arterial pressure and blood flow were characterized by a significant coherence in the HF band with little or no phase delay (synchronous oscillations). Relations between arterial pressure and vascular conductance were characterized in intact rats by a significant coherence in the LF band and a phase delay tending to pi radians (opposite oscillations), whereas in both sympathectomized and sinoaortic denervated rats, coherence did not reach significance. It is concluded that LF oscillations ofarterial pressure are mostly secondary to rhythmic fluctuations in the vasomotor sympathetic tone in several regional circulations. Part ofthese oscillations originate from the synchronizing influence of the baroreceptor reflex. The study also suggests that the respiratory (HF)oscillations of arterial pressure involve fluctuations in cardiac output of purely mechanical origin.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 07/07/20 alle ore 05:35:14