How Does Gabapentin Affects Post-operative Tonsillectomy Pain?

Tonsillectomy is one of the most commonly performed children's surgeries and produces a consistent pattern and intensity of pain in the recovery period. These qualities make this surgery ideal for the investigation of pain relieving medications. Adequate analgesia for tonsillectomy in the perioperative period presents a challenge to the anesthetist because opiates, which provide the most effective analgesia, are associated with a high incidence of nausea and vomiting, respiratory depression, and sedation. These effects make recovery from tonsillectomy particularly hazardous in children with Obstructive Sleep Apnea Syndrome (OSAS) (the primary indication for tonsillectomy or adenotonsillectomy) thus alternatives to opiates have been sought. Gabapentin is a drug with an extensive safety record in the treatment of children's seizures, and chronic pain syndromes. Recently studies have demonstrated new modes of action for this medication, both directly on pain and in increasing the efficacy of conventional opiate (morphine) pain relieving medications. As such it may have role in the relief of acute pain. We hypothesize that given preoperatively as a single dose; gabapentin will reduce postoperative pain and opiate requirement in children undergoing tonsillectomy. Randomization will follow a computer generated random pattern with 14 patients in each group (placebo or gabapentin). Pain and sedation will be recorded as will the incidence of vomiting, dizziness and pruritis. Pain will be assessed using the Coloured Analogue Scale and sedation with the University of Michigan Sedation Scale. The time to first oral intake of fluids will also be recorded. All recordings will be made at 5-minute intervals from time of extubation (time = 0) and will be made by an independent blinded recovery nurse. Subjects will stay in the PACU for a minimum of one hour from time zero, and will only be discharged to the Surgical Daycare Unit at a point after this when two successive pain measurements demonstrate a score of 3 or less. In the Surgical Daycare Unit pain assessment will continue at intervals of 30 minutes to a total time of 4 hours from time zero and will be recorded by a member of the research team blinded to nature of premedication. A telephone interview will be scheduled with the subject's parents at 24 hours from time zero.

Inclusion criteria

• Tonsillectomy
• Adenotonsillectomy
• ASA status 1 to 3
• Weight < 60 kg
• BMI < 30