Comparison of Dexamethasone Alone vs in Combination With Pericardium 6 (P6) Electrical Stimulation or Granisetron in the Prevention of Postoperative Nausea and Vomiting in Patients Undergoing Breast Cancer Surgery

Transcutaneous electrical acupoint stimulation (TEAS) was achieved by an electrical neuromuscular stimulation device (JNR2; designed by the Department of Hand Surgery, Huashan Hospital, Fudan University, manufactured by Energy Conservation and Environment Protection Technology Company, Jiatong University, Shanghai,China)