1、 Class I1. Beta blockers required in the recent past to controlsymptoms of angina or patients with symptomaticarrhythmias or hypertension.2. Beta blockers: patients at high cardiac risk owing tothe finding of ischemia on preoperative testing whoare undergoing vascular surgery.Class IIaBeta blockers:
2、 preoperative assessment identifiesuntreated hypertension, known coronary disease, ormajor risk factors for coronary disease.Class IIbAlpha2 agonists: perioperative control of hypertension,or known CAD or major risk factors for CAD.Class III1. Beta blockers: contraindication to beta blockade.2. Alpha2 agonists: contraindication to alpha2 agonists.