Efficacy and Safety of Yangyin Shuxin Decoction—a Chinese Herbal Medicine Formula For Heart Failure with Preserved Ejection Fraction: A Randomized Controlled Trial

Background. Heart failure with preserved ejection fraction (HFpEF) is a large subtype of heart failure (HF) characterized by exercise intolerance and reduced quality of life. Studies have shown that traditional Chinese medicine (TCM) combined with conventional Western medicine has a good effect on improving exercise tolerance and quality of life in patients with HFpEF, but the overall quality of evidence is low. This study aimed to determine the safety and efficacy of Yangyin Shuxin (YYSX) decoction in the treatment of HFpEF. Methods. A prospective, single-blind, single-center, randomized controlled clinical study was conducted. 64 patients with HFpEF were randomly assigned to receive oral YYSX decoction (150 ml, twice a day) combined with conventional Western treatment or conventional Western treatment alone at a ratio of 1 :  1. The course of treatment was 2 weeks, and the follow-up was 3 months. The primary outcome was peak oxygen uptake (peak VO2) measured by the cardiopulmonary exercise test (CPET). Furthermore, the safety of YYSX decoction was assessed. Results. 63 patients (31 in the YYSX group and 32 in the control group) were included in the full analysis set. The peak VO2 of the YYSX group was significantly higher than that of the control group (12.04 ± 3.41 vs. 11.02 ± 3.33, P = 0.013 ) after 2 weeks. The maximum voluntary ventilation (MVV) was significantly higher in the YYSX group compared with the control group ( P < 0.05 ). The YYSX group had a higher EQ-visual analogue scale (EQ-VAS) score (71.13 ± 13.95 vs. 70.94 ± 13.70, P < 0.05 ) and a lower TCM Four-Dimensional Diagnostic Information Scale (TCMFDIS) score (49.74 ± 24.73 vs. 64.16 ± 27.15, P < 0.05 ) than the control group. There was no statistical difference between two groups ( P = 0.160 ), although 51.61% of patients in the YYSX group showed a decrease in brain natriuretic peptide (BNP) levels of at least 30%, compared with 37.50% of patients in the control group. No serious adverse events were reported in either group, but systolic and diastolic blood pressure decreased and serum sodium levels increased slightly in the control group. Conclusion. The YYSX decoction combined with conventional Western treatment was superior to the conventional Western treatment alone in improving exercise tolerance, quality of life, and cardiopulmonary function of patients with HFpEF. YYSX decoction is safe and may prevent a drop in blood pressure and sodium retention. Trial Registration. Chinese Clinical Trial Registry (www.chictr.org/cn/, No. ChiCTR-IOR-17014206)