Overview Effects of Dexmedetomidine on Postoperative Cognitive Dysfunction During One-lung Ventilation in Elder Patients Status: Unknown status Trial end date: 2015-12-01 Target enrollment: Participant gender: Summary This study is to explore the effects of dexmedetomidine on postoperative cognitive dysfunction during one-lung ventilation in elder patients. Phase: Phase 4 Details Lead Sponsor: Tang-Du HospitalTreatments: AnestheticsDexmedetomidineEtomidateMidazolamPropofolRemifentanilRocuroniumSufentanilVecuronium Bromide