Transcephalic electrical impedance provides a means for quantifying pulsatile cerebral blood volume changes following head-up tilt.
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.
Grönlund
J
J
Cardiorespiratory Research Unit, University of Turku, Finland.
Jalonen
J
J
Välimäki
I
I
D001810:Blood Volume; D001921:Brain / Q000502:physiology; D002560:Cerebrovascular Circulation; D017097:Electric Impedance; D006801:Humans; D007231:Infant, Newborn; D007234:Infant, Premature; D011187:Posture