The target dosages were metoprolol 100 mg bid in 30 cases,bisoprolol 10 mg qd in 23 cases,and carvedilol 25 mg bid in 22 cases.

• 23例应用比索洛尔,靶剂量10mg,1次/d; 22例应用卡维地洛,靶剂量为25mg,2次/d。