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Titolo:
VASOMOTOR INSTABILITY PRECEDING TILT-INDUCED SYNCOPE - DOES RESPIRATION PLAY A ROLE
Autore:
LIPSITZ LA; MORIN R; GAGNON M; KIELY D; MEDINA A;
Indirizzi:
HEBREW REHABIL CTR AGED,RES & TRAINING INST,1200 CTR ST BOSTON MA 02131 HARVARD UNIV,SCH MED BOSTON MA 02131 BETH ISRAEL DEACONESS MED CTR,DEPT MED BOSTON MA 02131 BIKUR CHOLIM HOSP IL-91004 JERUSALEM ISRAEL
Titolo Testata:
Journal of applied physiology
fascicolo: 2, volume: 83, anno: 1997,
pagine: 383 - 390
SICI:
8750-7587(1997)83:2<383:VIPTS->2.0.ZU;2-5
Fonte:
ISI
Lingua:
ENG
Soggetto:
BLOOD-PRESSURE VARIABILITY; HEART-RATE; SPECTRAL CHARACTERISTICS; ARTERIAL-PRESSURE; FLUCTUATIONS; INTERVAL; DYNAMICS; VAGAL; CATS;
Keywords:
MAYER WAVES; POWER SPECTRAL ANALYSIS; NEURALLY MEDIATED; ARTERIAL PRESSURE; HEART RATE; VARIABILITY; DYNAMICS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
31
Recensione:
Indirizzi per estratti:
Citazione:
L.A. Lipsitz et al., "VASOMOTOR INSTABILITY PRECEDING TILT-INDUCED SYNCOPE - DOES RESPIRATION PLAY A ROLE", Journal of applied physiology, 83(2), 1997, pp. 383-390

Abstract

This study aimed to determine whether alterations in cardiovascular dynamics before syncope are related to changes in spontaneous respiration. Fifty-two healthy subjects underwent continuous heart rate (KR), arterial blood pressure (BP), and respiratory measurements during 10-min periods of spontaneous and paced breathing (0.25 Hz) in the supine and 60 degrees head-up tilt positions. Data were evaluated by power spectrum and transfer function analyses. During tilt, 27 subjects developed syncope or presyncope and 25 remained asymptomatic. Subjects with tilt-induced syncope had significantly greater increases in low-frequency (0.04-0.15 Hz) systolic BP, diastolic BP, and HR power during tilt than the asymptomatic subjects (P less than or equal to 0.01). This difference was present during spontaneous but not paced breathing. However, average tidal volume, respiratory rate, minute ventilation, proportion of breaths below 0.15 Hz, and low-frequency respiratory power during tilt did not differ between syncopal and nonsyncopal subjects. Transfer magnitudes between low-frequency respiration and BP, and betweenBP and interbeat interval, were also similar between groups. Thus vasomotor instability before syncope is not related to alterations in respiration or the cardiovagal baroreflex but may reflect oscillating central sympathetic outflow to the vasculature.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 16/07/20 alle ore 06:29:16