Esmolol
Group E was given Esmolol at 24 h (specification: 10 ml/0.1 g; manufacturer: Qilu Pharmaceutical Co., LTD.) to maintain a heart rate between 80/min and 100/min. The pharmacological characteristics of Esmolol show that bolus doses of 100 to 200 mg are effective in attenuating the adrenergic responses, followed by continuous intravenous infusion at dose of less than 300 ug/kg/min to control the heart rate[