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Titolo:
INFLUENCES OF NEURAL MECHANISMS ON HEART PERIOD AND ARTERIAL-PRESSUREVARIABILITIES IN QUADRIPLEGIC PATIENTS
Autore:
GUZZETTI S; COGLIATI C; BROGGI C; CAROZZI C; CALDIROLI D; LOMBARDI F; MALLIANI A;
Indirizzi:
L SACCO HOSP VIALBA,VIA GB GRASSI 74 I-20157 MILAN ITALY L SACCO HOSP VIALBA I-20157 MILAN ITALY UNIV MILAN,CNR,CTR RIC CARDIOVASC I-20157 MILAN ITALY OSPED LEGNANO,DIV RIANIMAZ I-20025 LEGNANO ITALY
Titolo Testata:
The American journal of physiology
fascicolo: 3, volume: 266, anno: 1994,
parte:, 2
pagine: 80001112 - 80001120
SICI:
0002-9513(1994)266:3<80001112:IONMOH>2.0.ZU;2-C
Fonte:
ISI
Lingua:
ENG
Soggetto:
POWER SPECTRAL-ANALYSIS; MAYER WAVES; HUMANS; BEAT; EXERCISE; DOG;
Keywords:
POWER SPECTRAL ANALYSIS; SPINAL RHYTHMICITY; SYMPATHOVAGAL BALANCE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
30
Recensione:
Indirizzi per estratti:
Citazione:
S. Guzzetti et al., "INFLUENCES OF NEURAL MECHANISMS ON HEART PERIOD AND ARTERIAL-PRESSUREVARIABILITIES IN QUADRIPLEGIC PATIENTS", The American journal of physiology, 266(3), 1994, pp. 80001112-80001120

Abstract

The heart period (R-R) variability power spectrum presents two components, at low (LF; similar to 0.10 Hz) and high (similar to 0.25 Hz) frequencies, whose reciprocal powers appear to furnish an index of sympathovagal interaction modulating heart rate. In addition, the LF component of the systolic arterial pressure variability spectrum furnishes amarker of sympathetic modulation of vasomotor activity. The contribution of spinal and supraspinal neural circuits to the genesis of these rhythmic oscillatory components remains largely unsettled. Therefore we performed spectral analysis of R-R and systolic arterial pressure variabilities in 15 chronic neurologically complete quadriplegic patients (QP) and in 15 control subjects during resting conditions, controlled respiration, and head-up tilt. At rest, in seven QP the LF componentwas undetectable in both cardiovascular variability spectra; in two QP this component was present only in R-R variability spectrum, whereasthe remaining six showed a significantly reduced LF in both signals. In QP, the LF component, when present, underwent paradoxical changes with respect to controls, decreasing during tilt and increasing during controlled respiration. In five QP in whom the recording session was repeated after 6 mo, a significant increase in LF was observed in both variability spectra. These data confirm the finding that a disconnection of sympathetic outflow from supraspinal centers can cause the disappearance of the LF spectral component. However, LF presence in some QPsupports the hypothesis of a spinal rhythmicity likely to be modulated by the afferent sympathetic activity.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 12/08/20 alle ore 01:22:09