Pregabalin Versus Dexmedetomidine for Delirium Treatment After Coronary Artery Bypass Grafting

Patients will receive pregabalin capsules (75 mg) every 12 h for 24 hours by nasogastric tube.

Patients will receive a bolus dose of 0.4 μg/kg dexmedetomidine (over a period of 10 to 20 min)