Dexmedetomidine Versus Lidocaine Infusions as Adjuvants to General Anesthesia for Chronic Pain Management After Mastectomy

Patients will receive 1 μg/kg of intravenous dexmedetomidine over 10 min followed by an intravenous infusion of 0.5 μg/kg/h.

Patients will receive a bolus of intravenous lidocaine 1.5mg/kg over 10 min followed by a continuous infusion of lidocaine 1.5mg/kg/h.

Patients will receive intravenous isotonic saline 0.9% in the same volume and manner as the study drugs.