- 3. Patients with high blood pressure and can't get a good control after antihypertensive drug therapy (systolic blood pressure>150mmHg, diastolic blood pressure>100mmHg); patients with grade Ⅱ or more myocardial ischemia or myocardial infarction, poorly controlled arrhythmia (including QTC interval≥450ms) and Ⅲ~Ⅳ grade cardiac insufficiency according to NYHA; cardiac color Doppler ultrasonography: LVEF <50%;