This prospective observational study aims to evaluate whether non-invasive hemodynamic parameters, including the plethysmographic variability index (PVI) and perfusion index (PI), can predict post-induction hypotension in patients undergoing diagnostic direct laryngoscopy under general anesthesia. Patients aged 18-75 years with ASA physical status I-III scheduled for elective direct laryngoscopy will be included. PVI and PI values will be recorded before anesthesia induction and in the early post-induction period. The relationship between these indices and the decrease in mean arterial pressure after induction will be analyzed to determine their predictive value for hypotension.
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Change in Mean Arterial Pressure (ΔMAP) After Anesthesia Induction and Its Association With Plethysmographic Variability Index (PVI) and Perfusion Index (PI)
Timeframe: From baseline before induction to 5 minutes after anesthesia induction.