Abstract
In recent years, there have been several reports of the usefulness of perfusion index (PI), and pleth variability index (PVI), measured with a pulse oximeter manufactured by Masimo Corporation, in the evaluation of the peripherally circulating blood volume and management of transfusions. In the present study, we tested and confirmed that it was possible to evaluate autonomic inhibition under general anesthesia by observing pulsatile components in the measurement sites (observation of PI). Furthermore, we examined whether the PVI obtained from respiratory variations in PI is useful as an index of fluid responsiveness, in comparison with the preceding arterial pressure wave-derived cardiac output (APCO).
