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Titolo:
SPECTRAL PATTERN OF NEONATAL CEREBRAL BLOOD-FLOW VELOCITY - COMPARISON WITH SPECTRA FROM BLOOD-PRESSURE AND HEART-RATE
Autore:
REYNOLDS KJ; PANERAI RB; KELSALL AWR; RENNIE JM; EVANS DH;
Indirizzi:
LEICESTER ROYAL INFIRM,DEPT PHYS MED LEICESTER LE1 5WW LEICS ENGLAND UNIV LEICESTER,FAC MED,DIV MED PHYS LEICESTER LEICS ENGLAND ROSIE MATERN HOSP CAMBRIDGE ENGLAND
Titolo Testata:
Pediatric research
fascicolo: 2, volume: 41, anno: 1997,
pagine: 276 - 284
SICI:
0031-3998(1997)41:2<276:SPONCB>2.0.ZU;2-X
Fonte:
ISI
Lingua:
ENG
Soggetto:
RESPIRATORY-DISTRESS SYNDROME; ASPHYXIATED TERM INFANTS; RATE-VARIABILITY; INTRAVENTRICULAR HEMORRHAGE; SINUS ARRHYTHMIA; DOPPLER SIGNALS; PRETERM INFANTS; WEEKS GESTATION; AUTOREGULATION; FLUCTUATIONS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
50
Recensione:
Indirizzi per estratti:
Citazione:
K.J. Reynolds et al., "SPECTRAL PATTERN OF NEONATAL CEREBRAL BLOOD-FLOW VELOCITY - COMPARISON WITH SPECTRA FROM BLOOD-PRESSURE AND HEART-RATE", Pediatric research, 41(2), 1997, pp. 276-284

Abstract

The cerebral blood flow velocity (CBFV) frequency spectra were studied in 106 premature and term newborns (gestational age range, 24-42 wk)and compared with the heart rate (HR) and mean arterial blood pressure (BP) spectra over the 0.005-0.5 Hz range. CBFV, BP, and HR were shown to have similar but not identical spectral patterns. Adjustment of a1/f(alpha) model to these spectra produced highly significant fittings, but the residuals were not independent. This condition was met onlyby the CBFV and BP spectra over a limited frequency range (0.005-0.06Hz). These results provide a characterization of the CBFV spectra fora much larger population of newborns than hitherto available, indicating that under certain conditions CBFV and BP might show the properties of chaotic systems. In infants without major complications, gestational age (GA) did not have a significant influence on the CBFV spectrum, whereas the spectral power to 0.5 Hz of both BP and HR was found to increase with GA. The spectral power increased over the first 24 h of postnatal life for all three variables; only CBFV showed a significantspectral change in the low frequency (LF, 0.02-0.08 Hz) range. A matched group comparison, adjusted far GA and postnatal age, indicated a reduction in CBFV LF power for term infants with birth asphyxia when compared with normal infants, which was not reproduced in the HR spectra.

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Documento generato il 01/12/20 alle ore 19:40:37