Effect and mechanism of ultrasound-guided quadratus lumborum block on postoperative early cognitive function after colorectal surgery / 临床麻醉学杂志

ABSTRACT

Objective To investigate the effect of ultrasound-guided quadratus lumborum block on cognitive function after laparoscopic colorectal surgery.Methods Seventy-six patients, there is no restriction on gender, aged 50-75 years, falling into ASA physical statusⅡorⅢ, who provided informed consent for their participation in this study and underwent colorectal surgery under general anesthesia were divided into two groups (groups Q and C).Induction of anesthesia was induced by intravenous midazolam 0.03 mg/kg, sufentanil 0.5μg/kg, etomidate 0.3 mg/kg and rocuronium 1 mg/kg in the two groups.Remifentanil 0.2-0.3μg·kg-1·min-1 and propofol 0.10-0.15 mg·kg-1·min-1 were maintained intravenously during anesthesia.0.375％ropivacaine 20 ml was injected between the psoas quadratus muscle and psoas major muscle under ultrasound guidance before extubation in group Q, only equal volume saline was given in group C.Neuropsychological tests were performed preoperatively as well as postoperative day 7.The postoperative pain was evaluated by VAS after surgery.The postoperative sleep quality was measured using a BIS-vista monitor.The changes of serum IL-6, IL-1β, TNF-αand CGRP levels were detected by ELISA at immediately after operation (T0), 1 hour (T1), 2 days (T2), 4 days (T3) and 7 days (T4) after operation.Results Seventy-six patients finished cognitive function tests (38 cases in group Q and 38 cases in group C), 12 cases (31.6％) were diagnosed as POCD in group C, 4 cases (10.5％) in group Q.Compared with group C, the incidence of POCD, VAS scores at 24 and 48 hours after operation in group Q were significantly lower (P<0.05), the sleeping time at night was longer, the serum levels of IL-6, IL-1βand TNF-αwere significantly lower at T2 and T3, and the serum levels of CGRP were significantly higher at T2-T4 (P<0.05 or P<0.01).Conclusion QLB treatment repaired the surgery induced early cognitive dysfunction by inhibiting the postoperative pain, excessive inflammatory response and improving the quality of sleep.