Perfusion Index-derived Parameters as Predictors Post-induction Hypotension.

"The PVI and PI will be recorded in the supine position by an anaesthesiologist who was not involved in the further intraoperative monitoring of the patient using Masimo SET (MightySat 9900, Masimo Corporation, Irvine, CA, USA). This device allows bluetooth radio for transfer of parameter data to a smart device. The device will be applied on the index finger of the dominant hand of each patient. It will be applied on the hand that neither contains the venous line nor the blood pressure cuff. Three measurements of PVI and PI on one minute interval will be recorded. We will use the average of these readings.~Dicpleth is defined as the ratio of the height of the dicrotic notch to the height of the systolic peak, measured at end-expiratory time."