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Early Hum Dev. 1997 Jan 3;47(1):11-8.

Transcephalic electrical impedance provides a means for quantifying pulsatile cerebral blood volume changes following head-up tilt.

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  • 1Cardiorespiratory Research Unit, University of Turku, Finland.


Transcephalic electrical impedance (delta Z) was used to assess pulsatile cerebral blood volume changes while tilting nine premature (30-34 weeks) infants 20 degrees head up. High-frequency (1.50-4.00 Hz) delta Z variability decreased 27% while heart rate did not show any change. We would like to suggest that the variability of transcephalic electrical impedance analysed with spectral estimation seems to provide a means for quantifying alterations in cerebral circulation.

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