Postoperative delirium is a common complication in clinical surgery. It has been reported that it can increase postoperative morbidity and mortality and lead to decreased functional and cognitive abilities. The aim of this study was to investigate the effect of ultrasound-guided bilateral rectus sheath blocks (RSB) on postoperative delirium in elderly patients undergoing laparoendoscopic single-site surgery (LESS) A double-blind, randomized controlled trial was conducted with 320 patients, aged 65-80 years, ASA I-III, who were scheduled to undergoing LESS in our hospital were selected, the patients divided into Group R and Group G by random number table method, with 160 patients in each group. Group R was subjected to a bilateral RSB under ultrasound guidance after general anesthesia, each side was given 0.5% ropivacaine 10 ml. Group G received simple general anesthesia. The mini-mental State Examination was used to assess all the patients' primary cognitive status one day before surgery. Perioperative variables were recorded to be compared. The investigators used the visual analog scale to assess patients' pain degree with postoperative, using confusion assessment method to assess whether patients experienced delirium.
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The mini-mental State Examination
Timeframe: one day before the operation.
Change from Baseline visual analogue scale
Timeframe: 30 minutes after extubation and 6 hours and 12 hours