The effect of preemptive perianal ropivacaine and ropivacaine with dexmedetomidine on pain after hemorrhoidectomy: a prospective, randomized, double-blind, placebo-controlled study.

The objective of this study was to assess the efficacy of perianal infiltration of ropivacaine and dexmedetomidine added to ropivacainein in the relief of pain after hemorrhoidectomy. Patients in group C(placebo control group, n = 21) received perianal injections of normal saline and those in group RO(ropivacaine injection group, n = 21) received ropivacaine, those in group RD(ropivacaine with dexmedetomidine injection group, n = 19) were administered ropivacaine with dexmedetomidine, prior to the initiation of the operation. Reductions of the VAS score, the frequency with which the PCA button was pushed, and fentanyl consumption were assessed in groups RO and RD as compared to that of group C, and in group RD as compared to that of group RO(p < 0.05). We concluded that the use of perianal ropivacaine injection prior to surgical incision reduced both postoperative pain and fentanyl consumption following hemorrhoidectomy, and the addition of dexmedetomidine to ropivacaine may have an additive effect in postoperative analgesic care.