Hypotension prediction index is a novel introduced monitoring-tool that aims to predict hypotension events before their occurence, and has been reported to have superior predictive ability than the commonly measured perioperative hemodynamic variables. To date, there is no information regarding its ability to predict hypotension events in each phase of thoracic surgery.
Investigators design this prospective observational study to exam the ability of hypotension prediction index in predicting intraoperative hypotension events in each phase of thoracic surgery