Operative technique
All operations was performed by the same surgeon under general anesthesia. We performed 40 HS tonsillectomy using a high-intensity focused ultrasound machine(Johnson & Johnson,New Brunswick,USA) at the level of 5 in dissection and 3 in haemostasis, performed 40 coblation tonsillectomy using EVac Xtra HP type knife head connected to Coblate Ⅱ Surgical System(ArthroCare Corp,Austin,USA) at the level of 7 in ablation and 3 in coagulation, and performed 40 CD tonsillectomy using sickle-shaped knives and bipolar electrocautery.
All patients were not given antibiotics, hemostatic drugs or other drugs after surgery. Patients were given a cold liquid diet in three days after the operation, and a cold semi-liquid diet in 14th postoperative day.