Effect of noise isolation during general anaesthesia on the incidence of moderate-to-severe pain after major abdominal surgery: multicentre randomized clinical study.

During the 24-h and 48-h periods after surgery, the number of patient-controlled intravenous analgesia boluses was significantly higher in the control group, which also had a higher extra analgesia requirement and increased total analgesic consumption compared with the noise isolation group.

The cumulative and maximum rest and movement pain scores were higher in the control than noise isolation group during the 48-h period after surgery.