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From the Department of Anaesthesiology and Biostatistics, Sanjay Gandhi Postgraduate Institute of Medical Sciences, Lucknow, India.
Address correspondence to: Dr. Chandra Kant Pandey, Department of Anaesthesiology, Sanjay Gandhi Postgraduate Institute of Medical Sciences, Lucknow 226014, India. Phone: 0091-522-2668800, ext. 2490; Fax: 0091-522-2668017 (attention to Dr. C.K. Pandey); E-mail: ckpandey{at}sgpgi.ac.in
Purpose: To evaluate the comparative preemptive effects of gabapentin and tramadol on postoperative pain and fentanyl requirement in laparoscopic cholecystectomy.
Methods: Four hundred fifty-nine ASA I and II patients were randomly assigned to receive 300 mg gabapentin, 100 mg tramadol or placebo in a double-blind manner two hours before laparoscopic cholecystectomy under general anesthesia. Postoperatively, patients’ pain scores were recorded on a visual analogue scale every two hours for the initial 12 hr and thereafter every three hours for the next 12 hr. Patients received fentanyl 2 µg•kg–1 intravenously on demand. The total fentanyl consumption for each patient was recorded.
Results: Patients in the gabapentin group had significantly lower pain scores at all time intervals (2.65 ± 3.00, 1.99 ± 1.48, 1.40 ± 0.95, 0.65 ± 0.61) in comparison to tramadol (2.97 ± 2.35, 2.37 ± 1.45, 1.89 ± 1.16, 0.87 ± 0.50) and placebo (5.53 ± 2.22, 3.33 ± 1.37, 2.41 ± 1.19, 1.19 ± 0.56). Significantly less fentanyl was consumed in the gabapentin group (221.16 ± 52.39 µg) than in the tramadol (269.60 ± 44.17 µg) and placebo groups (355.86 ± 42.04 µg; P < 0.05). Sedation (33.98%), nausea/retching/vomiting (24.8%) were the commonest side effects in the gabapentin group whereas respiratory depression (3.9%) was the commonest in the tramadol group and vertigo (7.8%) in the placebo group.
Conclusion: Preemptive use of gabapentin significantly decreases postoperative pain and rescue analgesic requirement in laparoscopic cholecystectomy.
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