Perfusion Index as a Predictor of Postinduction Hypotension of General Anesthesia in Geriatric Patients

Hemodynamic parameters will be recorded at 1-min intervals till 10 min after intubation. Hypotension will be defined as a drop in SBP to \<30% of baseline or absolute MAP \<60 mmHg. MAP \<55 mmHg (severe hypotension) will be treated immediately by rapid intravenous fluid administration (10 ml/kg) and ephedrine sulphate 6 mg IV boluses. Bradycardia will be defined as HR \<50 bpm or decrease by more than 30% below baseline value, whichever will be lower and will be treated with atropine 0.6 mg IV boluses. The incidence of hypotension will be calculated in 2 sets - 5 min after induction of anesthesia (effect of induction agent) and first 15 min after induction (effect of induction process and endotracheal intubation).