Nuanxin capsule for heart failure: A systematic review of randomized controlled trials

To assess the efficacy and safety of Nuanxin capsule for patients with heart failure (HF).

A systematic literature search was performed in 6 databases: PubMed, EMBASE, Chinese National Knowledge Infrastructure (CNKI), Wan-fang Data Information Site, Chinese BioMedical Database (CBM), VIP Chinese Science and Technique Journals Database from the date of its inception up to November 2016. Review Manager 5.2 software was used for assessment of risk of bias, data synthesis and subgroup analysis. Begg and Egger tests were used for assessing symmetries of funnel plot by software Stata 12.0. We conducted the GRADE system to assess the quality of evidence.

12 trials involving 1418 participants were eligible. Compared with western medicine (WM) alone, Nuanxin capsule plus WM showed statistical significance in total effective rate (RR 1.18, 95% condidence interval [CI] 1.13-1.25). According to subgroup analysis, the 6-months group and the 12-months group have better effect than the 3-month group. As for 6-minute walking distance (6MWT), Nuanxin capsule plus WM compared with WM has significantly increased walking distance (weighted mean difference [WMD] 42.56, 95% CI 34.27-50.85). Nuanxin capsule plus WM has significantly decreased in mortality (RR 0.29, 95% CI 0.18-0.46) and re-admission rate (RR 0.48, 95% CI 0.39-0.60) compared with WM. Nuanxin capsule plus WM was beneficial for B-type natriuretic peptide (-240.47, 95% CI -332.45-148.49). gger's and Begg's test showed that there was no publication bias exist (P = .937). Influence analysis showed that no single study affected the overall result. The GRADE quality of the evidence was very low to Moderate across the different outcomes.

Despite of the apparently positive findings, we cannot draw a sound conclusion that Nuanxin capsule has positive effect in patients with HF, because of the insufficient evidence.