8. Post-op analgesic regimen: Morphine PCA > 50 kg (demand 1 mg, 10 minute lockout, basal rate 0.5 mg/hr) and Morphine PCA < 40-49 kg (demand 0.8 mg, 10 minute lockout, basal rate 0.4 mg/hr), benzodiazepine, gabapentin, ketorolac and clonidine per standard protocol for all participants.