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Sevoflurane-associated HF phase shift may confound baroreflex interpretation under anesthesia; leaves open clinical relevance pending prospective validation.
Background: The phase relationship indicates the time delay between the input signal (systolic blood pressure, SBP) and output signal (R-R interval, RRI). In contrast to the awake state, little is known about the effects of general anesthesia on the phase shift. In the present study, we tested the hypothesis that sevoflurane anesthesia causes a phase change between the two signals.
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Kim et al. (2007) studied this question.
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