# Trials evaluating nicorandil renoprotection against contrast-induced nephropathy after coronary angiography or percutaneous coronary intervention: a systematic review and meta-analysis

## TL;DR

This study finds that nicorandil may help protect kidneys during heart procedures, but more research is needed.

## Contribution

The study provides new evidence on nicorandil's dose-dependent renoprotective effect against contrast-induced nephropathy.

## Key findings

- Nicorandil reduced contrast-induced nephropathy occurrence from 13.15% to 5.14% compared to placebo.
- Double-dose nicorandil further reduced CIN incidence to 3.9% compared to 8.4% with standard dose.
- No significant protective effect was found against major adverse cardiovascular or kidney events.

## Abstract

Ischaemic heart disease (IHD) is a leading cause of mortality and morbidity globally. Coronary angioplasty has a vital role in treating coronary artery disease. However, this is associated with a small risk of serious side effects, including contrast-induced nephropathy, vascular complications and arrhythmia. Contrast-induced nephropathy (CIN) is a serious and common complication of coronary angioplasty that can lead to renal failure and major adverse cardiac and renal outcomes.

We conducted a systematic review and meta-analysis by searching multiple databases, including PubMed, Scopus, Embase, Google Scholar, and ScienceDirect, as well as other sources. The inclusion and exclusion criteria are described in detail later in this article. Two independent reviewers performed the literature search in September 2024 and identified 282 articles. The study was conducted following the population, intervention, comparator, and outcome (PICO) framework and the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines. A total of 17 studies were included in the final analysis after applying the inclusion and exclusion criteria. The exclusion criteria were guidelines, case reports, qualitative research, and letters to the editor, commentaries, conference proceedings, gray literature, opinions, policy papers, and case series. Articles published after 2010 were included in this meta-analysis, and data analysis was performed using Rayyan statistical software.

This study demonstrated that nicorandil was associated with protective effects against CIN. The total number of patients in the Nicorandil and placebo groups were 3836 and 3858 respectively. The occurrence of CIN was 5.14% in the nicorandil group, compared with 13.15% in the control group. This study also confirmed the dose-dependent effect of nicorandil on CIN. Among 662 patients enrolled in three studies, 3,9% in the double dose (DD) group presented with CIN, compared with 8,4% in the standard dose (SD) group. The occurrence of MACE was 5.7% in the Nicorandil group and 8.2% in the control group. However, there was no statistically significant protective effect against major adverse cardiovascular events (MACE) or major adverse kidney events (MAKE). Only a few studies measured the impact on MAKE, and the findings may not be truly representative of its effects.

This study demonstrated the renoprotective effects of nicorandil in preventing CIN in patients undergoing coronary angioplasty, and this relationship was also evident from the double-dose response. Further larger size randomised controlled trials are recommended to assess the efficacy of nicorandil in preventing CIN in patients undergoing coronary angioplasty.