Correlation of rheoencephalogram and @entity428 : results of a XXXX study.

@entity428 @entity53537 @entity35 @entity30144 @entity551
UNASSIGNED: Measuring brain electrical impedance (rheoencephalography- @entity30144 ) is a potential technique for noninvasive, continuous neuro-monitoring. Typically, @entity428 ( @entity428 ), an invasive monitoring modality, is used in brain monitoring. Our hypothesis was that both modalities would reflect cerebrovascular reactivity. In the present study we compared results of @entity30144 to results of @entity428 measurement. @entity35 were used under anesthesia ([Formula: see text]; 36 control and 59 @entity53537 infusions). @entity30144 was measured by two bipolar @entity30144 amplifiers; time constants (Tc) were 3 and 0.3 s. The @entity53537 injection caused a transient @entity551 (SAP) and a simultaneous increase in @entity428 and @entity30144 pulse amplitude. SAP decrease was 25%              14%; @entity428 was 28%              16%; @entity30144 pulse amplitude increase was 209%              17% (Tc 3) and 107%              68% (Tc 0.3). @entity428 increase correlated with @entity30144 pulse amplitude increase. Area under the receiver operating characteristic curve was 0.9481 for @entity428 - @entity30144 time constants 3 and 0.9335 for @entity428 - @entity30144 time constants 0.3; both with [Formula: see text]. The fact that both @entity30144 and @entity428 reflect cerebrovascular reactivity indicates the usefulness of @entity30144 as a potential technique for noninvasive, continuous neuro-monitoring. The Tc of @entity30144 amplifier requires optimization for continuous monitoring of pressure reactivity index.
