Meta-analysis of effect of renin-angiotensin-aldosterone system blockers on contrast-induced nephropathy.

Background: The purpose of this study was to systematically evaluate the effect of renin-angiotensin-aldosterone system blockers on the incidence of contrast-induced nephropathy in patients undergoing coronary angiography or percutaneous coronary intervention.

Methods: A systematic literature search of several databases was conducted to identify studies that met the inclusion criteria. A total of 12 studies with 14 trials that performed studies on a total of 4864 patients (2484 treated with renin-angiotensin-aldosterone system blockers and 2380 in the control group) were included. The primary endpoint was the overall incidence of contrast-induced nephropathy. Analyses were performed with STATA version 12.0.

Results: The overall contrast-induced nephropathy incidence in renin-angiotensin-aldosterone system blocker and control groups was 10.43% and 6.81%, respectively. The pooled relative risk of contrast-induced nephropathy incidence was 1.22 (95% confidence interval: 0.81-1.84) in the renin-angiotensin-aldosterone system blocker group. An increased risk of developing contrast-induced nephropathy in the renin-angiotensin-aldosterone system blocker group was observed among older people, non-Asians, chronic users, and studies with larger sample size, and the pooled RRs and 95% confidence intervals were 2.02 (1.21-3.36), 2.30 (1.41-3.76), 1.69 (1.10-2.59) and 1.83 (1.28-2.63), respectively.

Conclusions: Intervention with renin-angiotensin-aldosterone system blockers was associated with an increased risk of contrast-induced nephropathy among non-Asians, chronic users, older people, and studies with larger sample size. Large clinical trials with strict inclusion criteria are needed to confirm our results and to evaluate the effect further.