Waagstein等认为长期口服β阻滞剂,可改善严重充血性心肌病的临床症状、活动能力、心室功能,并可延长患者生存,停药后复发,但他们研究缺乏对照。急性给β阻滞剂的血液动力学研究,表明充血性心肌病患者左室扩张,动脉压降低,心肌顺应性改善,其中某些改变对患者有助益,而心室扩张则不利。作者用双育交叉试验,对 Waagstein that long-term oral β-blocker can improve the clinical symptoms of severe congestive cardiomyopathy, mobility, ventricular function, and can extend the survival of patients, relapse after stopping, but they lack of control. Hemodynamic studies of acute beta blockers have shown that left ventricular dilatation, reduced arterial pressure, and improved cardiac compliance in patients with congestive cardiomyopathy, some of which are beneficial in patients with ventricular dilatation, are detrimental. The authors used double-cross test, yes