Effect of Dexamethasone Combined With Ondansetron on Postoperative Nausea and Vomiting in Patients With Patient-controlled Analgesia After Video-assisted Thoracoscopic Surgery

The purpose of this study is to study the effect of dexamethasone combined with ondansetron on postoperative nausea and vomiting in patients with patient-controlled analgesia after video-assisted thoracoscopic surgery.

Inclusion Criteria:

• Patients undergoing video-assisted thoracoscopic surgery
• Age 20-75
• American Society of Anesthesiologists physical status classification I or II

Exclusion Criteria:

• Antiemetic within 24 hrs
• Taking Steroids, Opioids within 1 week
• Active drug or alcohol abuse
• GI motility disorder, severe renal/ hepatic disease.