[Effects of transcutaneous electrical acupoint stimulation on treatment and prevention of postoperative sore throat after tracheal intubation under general anesthesia]

Objective: To observe the clinical efficacy of transcutaneous electrical acupoint stimulation (TEAS) at Hegu (LI 4) and Neiguan (PC 6) on treatment and prevention of postoperative sore throat (POST) after tracheal intubation under general anesthesia.

Methods: One hundred patients who received elective thyroid gland lobectomy with gradeⅠand Ⅱ of American Society of Anesthesiologists criteria were randomly assigned into a TEAS group and an anesthesia group according to random number table method, 50 cases in each group. All the patients were treated with tracheal intubation under general anesthesia. Patients in the TEAS group were treated with TEAS (2 Hz/100 Hz, 8 to 12 mA) at Hegu (LI 4) and Neiguan (PC 6) from 30 min before anesthesia induction to the end of operation. Patients in the anesthesia group were treated with TEAS at the same acupoints but no electrical stimulation was given. The incidence rate, severity and visual analogue scale (VAS) of POST were recorded 1h, 6h, 12h and 24h after tracheal extubation, respectively.

Results: The incidence rate of POST was 12.0% (6/50), 22.0% (11/50) and 18.0% (9/50) 1h, 6h, 12h after tracheal extubation respectively in the TEAS group, which was significantly lower than 30.0% (15/50), 42.0% (21/50) and 36.0% (18/50) in the anesthesia group (all P<0.05). However, the incidence rate was not significantly different between the two groups 24h after extubation[14.0% (7/50) vs 28.0% (14/50), P>0.05]. Moreover, the VAS scores of the patients with POST in the TEAS group at each time point were lower than those in the anesthesia group (all P<0.05).

Conclusions: TEAS at Hegu (LI 4) and Neiguan (PC 6) can effectively reduce the incidence rate and severity of POST induced by tracheal intubation under general anesthesia.