Study Status: Recruiting
Recruit Status: Recruiting
Study Type: Observational
Official Title: Pleth Variability Index Predicts Hypotension in Beach Chair Position in Mechanically Ventilated Adults During General Anesthesia
Brief Summary: The beach chair position for shoulder operation induces hypotension during general anesthesia. Hypotension is induced by decreased preload and contractility due to anesthesia. Masimo is a pulse oximetry which shows pleth variability index noninvasively. The pleth variability may predict the hypotension during beach chair position.