2.4. Measurement
nausea, postoperative shoulder pain, shoulder pain, pain
The incidence of postoperative shoulder pain was the primary outcome measure. The follow-up duration was 36 hours postoperatively. At 12, 24, and 36 hours postoperatively. After transfer to general ward, a trained research nurse visited patients and explained how and when to fill out the pain diary and interviewed pain characteristics during follow-up period. The patients recorded shoulder pain and surgical site pain at the pain diary using numerical rating scale. In addition, it was recorded whether shoulder pain occurred at any time during the follow-up period. If shoulder pain was present, the worst pain score was recorded. Patients were also asked whether the shoulder pain was related to the position. We assessed the frequency and the scores of surgical site pain at 12, 24, and 36 hours postoperatively. Rescue pain and nausea medications, and ambulation time after surgery were recorded.