Analgesic Effect of Low Dose Subcutaneous Ketamine Administration Before and After Cesarean Section

Background: Pain is considered as an importantissue after cesarean section. Multimodal approach to post cesarean pain management may not only enhance analgesia but also reduce side effects after the surgery. Objectives: This study was aimed to evaluate the clinical efficacy of subcutaneous injection of low dose ketamine at the incision site to reduce cesarean section pain. Patients and Methods: Sixty patients, aged between 18 and 25 years old, scheduled for elective cesarean section, were enrolled to this double-blind randomized controlled trial study. Patients were divided into three groups of 20 patients each group one (k-pre) received 0.5 mg/kg ketamine before skin incision and normal saline after skin closure, group two (k-post) received normal saline before skin incision and 0.5 mg/kg ketamine after skin closure and group three (C) received normal saline before skin incision and after skin closure; subcutaneously at the incision site. The first analgesic request, the amount of analgesic and the pain intensity were evaluated for 24 hours. Results: The first time analgesic requested was longer and the amount of analgesic used during the first 24 hours was significantly lower in groups K-pre and K-post compared with group C (P < 0.05). Pain intensity was significantly lower at 2, 4, 6 and 12 hours in groups K-pre and K-post compared with group C (P < 0.05). Nevertheless, pain intensity was not significantly different at 18 and 24 hours in group C (P > 0.05). The first requested time, total used amount of analgesicand pain intensity were not meaningfully different in K-pre and K-post groups (P > 0.05). Conclusions: Patients who were given ketamine before or after cesarean section subcutaneously at incision site had lower pain intensity and less analgesic consumption than patients who were given placebo.