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Titolo:
Effects of spinal section and of positive-feedback excitatory reflex on sympathetic and heart rate variability
Autore:
Montano, N; Cogliati, C; da Silva, VJD; Gnecchi-Ruscone, T; Massimini, M; Porta, A; Malliani, A;
Indirizzi:
Univ Milan, Osped L Sacco, Dipartimento Sci Preclin LITA Vialba, Ctr Ric Cardiovasc CNR, I-20157 Milan, Italy Univ Milan Milan Italy I-20157 Ric Cardiovasc CNR, I-20157 Milan, Italy
Titolo Testata:
HYPERTENSION
fascicolo: 6, volume: 36, anno: 2000,
pagine: 1029 - 1034
SICI:
0194-911X(200012)36:6<1029:EOSSAO>2.0.ZU;2-F
Fonte:
ISI
Lingua:
ENG
Soggetto:
ARTERIAL BLOOD-PRESSURE; SPECTRAL-ANALYSIS; NERVE ACTIVITY; DECEREBRATE CATS; FLUCTUATIONS; MECHANISMS; DISCHARGE; INTERVAL; PATTERNS; RHYTHMS;
Keywords:
autonomic nervous system; sympathetic nervous system; heart; reflex;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Clinical Medicine
Life Sciences
Citazioni:
32
Recensione:
Indirizzi per estratti:
Indirizzo: Malliani, A Univ Milan, Osped L Sacco, Dipartimento Sci Preclin LITA Vialba, Ctr Ric Cardiovasc CNR, Via GB Grassi 74, I-20157 Milan, Italy Univ Milan Via GB Grassi 74 Milan Italy I-20157 Milan, Italy
Citazione:
N. Montano et al., "Effects of spinal section and of positive-feedback excitatory reflex on sympathetic and heart rate variability", HYPERTENSIO, 36(6), 2000, pp. 1029-1034

Abstract

The sympathetic outflow appears to be capable of displaying a rhythmicity synchronous with cardiovascular Mayer's waves even after spinal-section. Totest the hypothesis that spinal sympathetic low frequency (LF) oscillationcan be enhanced during sympathetic excitation, we recorded cardiac sympathetic nerve activity (SNA), R-R interval, arterial pressure, and ventilationin 9 unanesthetized decerebrate-vagotomized cats before and after C1 spinal section. LF and high frequency (HF) components were detected in the variability of SNA, R-R interval, and systolic arterial pressure both before andafter spinal section. In this latter condition, a significant coherence between LFSNA and LFR-R was present in 5 animals, whereas HFSNA and HFR-R were correlated in 4 animals. During an excitatory sympathetic spinal reflex elicited by aortic constriction, the efferent sympathetic firing was markedly enhanced (from 7 +/- 2 to 33 +/- 7 spikes/s); concomitantly, the powers of both LFSNA and HFSNA were also increased. Coherence between LFSNA and LFR-R became significant in all cases, whereas HFSNA and HFR-R became correlated in 6 animals. In 3 animals, the reflex sympathetic excitation was no longer elicitable after interrupting a vast contingent of sympathetic afferents by means of thoracic dorsal root section, We report for the first time that: LF and HF oscillations are detectable in SNA, R-R interval, and systolic arterial pressure variabilities of decerebrate-vagotomized spinal cats and that an excitatory spinal reflex is capable of increasing the power of both SNA spectral components.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 10/07/20 alle ore 12:47:13