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Background:Pharmacological therapy for congestive heart failure (CHF) with ventricular arrhythmia is limited.In the study,our aim was to evaluate the effects of Chinese traditional medicine Shensong Yangxin capsules (SSYX) on heart rhythm and function in CHF patients with frequent ventricular premature complexes (VPCs).Methods:This double-blind,placebo-controlled,multicenter study randomized 465 CHF patients with frequent VPCs to the SSYX (n =232) and placebo groups (n =233) for 12 weeks of treatment.The primary endpoint was the VPCs monitored by a 24-h ambulatory electrocardiogram.The secondary endpoints included the left ventricular ejection fraction (LVEF),left ventricular end-diastolic diameter,N-terminal pro-brain natriuretic peptide (NT-proBNP),New York Heart Association (NYHA) classification,6-min walking distance (6MWD),Minnesota Living with Heart Failure Questionnaire (MLHFQ) scores,and composite cardiac events (CCEs).Results:The clinical characteristics were similar at baseline.SSYX caused a significantly greater decline in the total number of VPCs than the placebo did (-2145 ± 2848 vs.-841 ± 3411,P ＜ 0.05).The secondary endpoints of the LVEE NYHA classification,NT-proBNP,6MWD,and MLHFQ scores showed a greater improvements in the SSYX group than in the placebo group (ALVEF at 12th week:4.75 ± 7.13 vs.3.30 ± 6.53;NYHA improvement rate at the 8th and 12th week:32.6％ vs.21.8％,40.5％ vs.25.7％;mean level of NT-proBNP in patients with NT-proBNP ＞125 pg/ml at 12th week:-122 [Q1,Q3:-524,0] vs.-75 [Q1,Q3:-245,0];A6MWD at 12th week:35.1 ± 38.6 vs.17.2 ± 45.6;AMLHFQ at the 4th,8th,and 12th week:-4.24 ± 6.15 vs.-2.31 ± 6.96,-8.l 9 ± 8.41 vs.-3.25 ± 9.40,10.60 ± 9.41 vs.-4.83 ± 11.23,all P ＜ 0.05).CCEs were not different between the groups during the study period.Conclusions:In this 12-week pilot study,SSYX was demonstrated to have the benefits of VPCs suppression and cardiac function improvement with good compliance on a background of standard treatment for CHF.