Variability of Perfusion Index to Predict Hypotension

"Patients will be monitored as usual using an SpO2 sensor placed on the index finger of the limb contralateral to the pressure cuff, giving the PI value, a tensiometer taking blood pressure (systolic, diastolic and mean) every 2 minutes, and an ECG.~A transthoracic cardiac echocardiogram will be performed with measurement of the sub-aortic time-velocity integral, and the same measurement will be performed 1 min after a passive leg-lift to see if this maneuver significantly increases systolic ejection volume. The PI value and blood pressure will be measured at each of these maneuvers."

The perfusion index (PI) value and arterial pressure will be measured at each of manoeuvre