The Effect of Preoperative Aminophylline

Inclusion Criteria: * Patients age: 20-60 years * Males and females patients * American Society Of Anesthesiology (ASA) physical status I- II . Exclusion Criteria: * Patient refusal to participate in this study * Patient with known sensitivity to aminophylline * Patients with history of cardiac failure * Patients with renal or hepatic dysfunction and in chronic alcoholism since clearance of aminophylline is decreased. * Patients with peptic ulcer, hyperthyroidism, glaucoma,as these conditions may be exacerbated. * Patients with opioid addiction * Current treatment with B agonists, anticholinergic agents, tranquilizers, anticonvulsants ,or antidepressants. * Pregnancy. * Habitual coffee consumption exceeding 2 cups per day.