It has not been proved the efficacy of morphine derived at periphery opium receivers. Studies are trying to demonstrate the power of the drug to interfere in the intensity of surgical pain while infiltrating in the periphery nerves. This study evaluated the infiltration of morphine associated with local anesthesia in anorectal surgery. Sixty one patients were analyzed, male and female, divided in two groups: in one group was associated morphine in the local anesthesia while in the other group only the local anesthetic was used. The patients of both groups were submitted to the same protocol standardized sedative during the surgery and postoperative analgesia. The intensity of pain was evaluated when it appeared, the time with analgesia was analyzed and other complications were registered. The intensity of pain was similar in both groups, the time with analgesia was longer in the group where morphine was used, although it was not significant in the statistics and the complications after the surgery were not significant in both groups. So the infiltration of morphine in the anorectal region has benefices in the postoperative analgesia but it was not significant in the statistics and it does not increase the complications related with morphine as urinary retention and itching.
Morphine; analgesia; opium receivers; nerves of periphery; local anesthesia
