Preemptive gabapentin decreases postoperative pain after lumbar discoidectomy.

Objective: We investigated whether the preemptive use of gabapentin, a structural analogue of gamma amino butyric acid could reduce postoperative pain and fentanyl consumption in patients after single-level lumbar discoidectomy.

Methods: Fifty-six ASA I and II patients were randomly allocated into two equal groups to receive either gabapentin 300 mg or placebo two hours before surgery. After surgery, the pain was assessed on a visual analogue scale (VAS) at intervals of 0-6, 6-12, 12-18, and 18-24 hr at rest. Total fentanyl consumption in the first 24 hr after surgery was also recorded. Fentanyl 2 mug.kg(-1) intravenously was used to treat postoperative pain on patients' demand.

Results: Patients in the gabapentin group had significantly lower VAS scores at all time intervals of 0-6, 6-12, 12-18, and 18-24 hr than those in the placebo group (3.5 +/- 2.3, 3.2 +/- 2.1, 1.8 +/- 1.7, 1.2 +/- 1.3 vs 6.1 +/- 1.7, 4.4 +/- 1.2, 3.3 +/- 1.1, 2.1 +/- 1.2; P < 0.05). The total fentanyl consumed after surgery in the first 24 hr in the gabapentin group (233.5 +/- 141.9, mean + SD) was significantly less than in the placebo group (359.6 +/- 104.1; P < 0.05).

Conclusions: Preemptive gabapentin 300 mg po significantly decreases the severity of pain postoperatively in patients who undergo single-level lumbar discoidectomy.