RESUMEN
Neuromuscular block (NMB) is frequently used in abdominal surgery to improve surgical conditions by relaxation of the abdominal wall and prevention of sudden muscle contractions.The evidence supporting routine use of deep NMB is still under debate.We aimed to provide evidence for the superiority of routine use of deep NMB during laparoscopic surgery.We performed a systematic review and metaanalysis of studies comparing the influence of deep vs moderate NMB during laparoscopic procedures on surgical space conditions and clinical outcomes.Trials were identified from Medline,Embase,and Central databases from inception to December 2016.We included randomized trials,crossover studies,and cohort studies.Our search yielded 12 studies on the effect of deep NMB on the surgical space conditions.Deep NMB during laparoscopic surgeries improves the surgical space conditions when compared with moderate NMB,with a mean difference of 0.65 [95％ confidence interval (CI):0.47-0.83] on a scale of 1-5,and it facilitates the use of low-pressure pneumoperitoneum.Furthermore,deep NMB reduces postoperative pain scores in the postanaesthesia care unit,with a mean difference of-0.52 (95％ CI:-0.71 to -0.32).Deep NMB improves surgical space conditions during laparoscopic surgery and reduces postoperative pain scores in the postanaesthesia care unit.Whether this leads to fewer intraoperative complications,an improved quality of recovery,or both after laparoscopic surgery should be pursued in future studies.The review methodology was specified in advance and registered at Prospero on July 27,2016,registration number CRD42016042144.