INTRODUCTION: Contrast-induced nephropathy (CIN) is a serious but preventable complication of coronary procedures. Trimetazidine (TMZ) has recently been explored for use in preventing post-procedural CIN due to its cellular anti-ischemic and antioxidant properties. The objective is to assess the efficacy of oral TMZ in the prevention of contrast induced nephropathy during elective coronary angiography and PCI among patients with renal impairment.

METHODS: We conducted a systematic search of the Cochrane Central Register of Controlled Trials, Pubmed/ MEDLINE, EMBASE, clinicaltrials.gov for articles published until June 2016 for randomized controlled trials examining the effects of adding oral TMZ to standard therapy in preventing CIN. Outcome measures were incidence of CIN, defined as a 0.5 mg/dl or ?25% increase in serum creatinine 48-72 hours after contrast exposure, and incidence of dialysisrequiring CIN. Validity of studies was assessed through a risk assessment tool available from Cochrane. Treatment effect was estimated by calculating the Mantel-Haenszelweighted risk ratio (RR) using a fixed-effects model available from RevMan 5.3.

RESULTS: A total of four studies comprising 714 patients (TMZ group=352, Control group=362) were included in the final analysis. Pooled results revealed the TMZ group was associated with significantly fewer incidences of CIN compared to control (RR 0.33, 95% confidence interval [CI], 0.20, 0.53; P<.00001), with a relative risk reduction of 67% and an absolute risk reduction of 11.04% (NNT=nine). No dialysis-requiring CIN was observed in the included studies.

CONCLUSION: The addition of oral TMZ to standard hydration confers a significant benefit in preventing CIN after coronary procedures among patients with mild to moderate renal impairment. We recommend the addition of TMZ to standard prevention strategies. However, a large well-designed trial should be conducted to determine its effect on other outcomes such as prevention of dialysis-requiring CIN and mortality.