芪附强心汤联合西药常规疗法治疗射血分数保留的心力衰竭心阳亏虚、血瘀水停证患者临床观察-Qifu Qiangxin Decoction combined with conventional therapy of western medicine treating heart failure with preserved ejection fraction of deficient heart-yang induced blood stasis and water retention pattern: A clinical observation