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Effects of dexmedetomidine as an adjunct in transversus abdominis plane block during gynecological laparoscopy.

Ultrasound-guided transversus abdominis plane (TAP) block for abdominal surgery has been widely studied in clinical settings. However, dexmedetomidine as an adjunctive analgesic combined with TAP block has been rarely reported. The present study evaluated the efficacy of TAP block combined with dexmedetomidine adjunct for gynecological laparoscopy. In brief, 90 patients were randomly divided into three groups: Group I, which received post-operative intravenous analgesia only after general anesthesia; Group II, which received a TAP block with 20 ml 0.375% ropivacaine; and Group III, which received a TAP block with 20 ml of 0.375% ropivacaine and 1 µg/kg dexmedetomidine after induction. In all groups, propofol was used for general anesthesia. The dosage of propofol, duration of the operation, and the time of awakening, spontaneous breathing and extubation were recorded. In addition, the Steward and visual analogue scale (VAS) scores were determined at 2, 4, 8, 12 and 24 h post-surgery. The occurrence of nausea and vomiting and/or respiratory depression was also recorded. Compared with those in Group I, the dosage of propofol, as well as the time of awakening, spontaneous breathing and extubation were significantly decreased in Group III (P<0.01 and P<0.05, respectively). In addition, the VAS score at 2 and 4 h in Group II (both P<0.05) and 2, 4 (both P<0.01) and 8 h (P<0.05) in Group III after the surgery were significantly lower compared with those in Group I. Furthermore, in Groups II and III, a lower number of cases experienced nausea and vomiting (P<0.05). In conclusion, the ultrasound-guided TAP block combined with dexmedetomidine adjunct may improve recovery from anesthesia and reduce post-operative pain (trial registration no. ChiCTR-IPR-15007398).

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