右美托咪定复合瑞芬太尼麻醉在老年腹部手术中的麻醉效果及对术后认知功能障碍的影响
The Anesthetic Effects of Dexmedetomidine Combined with Remifentanil in Elderly Patients Undergoing Abdominal Surgery and Its Effect on Postoperative Cognitive Dysfunction
