Fig. 4From: Dexmedetomidine and sufentanil combination versus sufentanil alone for postoperative intravenous patient-controlled analgesia: a systematic review and meta-analysis of randomized controlled trialsForest plot of meta-analysis of sufentanil consumption during the first 24 h (a) and 48 h postoperatively (b). DEX = dexmedetomidine; CI = confidence intervalBack to article page