Mild renal insufficiency and attributable risk of adverse In-hospital outcomes in patients with Acute Coronary Syndrome from the improving care for Cardiovascular Disease in China (CCC) project

BACKGROUND: Renal insufficiency (RI) is a frequent comorbidity among patients with acute coronary syndrome (ACS). We aimed to evaluate the attributable risk associated with mild RI for the in-hospital outcomes in patients with ACS. METHODS: The Improving Care for Cardiovascular Disease in China-ACS (CCC-ACS) Project was a collaborative study of the American Heart Association and the Chinese Society of Cardiology. A total of 92,509 inpatients with a discharge diagnosis of ACS were included. The attributable risk was calculated to investigate the effect of mild RI (eGFR 60-89 ml / min · 1.73 m(2)) on major adverse cardiovascular events (MACEs) during hospitalization. RESULTS: The average age of these ACS patients was 63 years, and 73.9% were men. The proportion of patients with mild RI was 36.17%. After adjusting for other possible risk factors, mild RI was still an independent risk factor for MACEs in ACS patients. In the ACS patients, the attributable risk of eGFR 60-89ml/min·1.73m(2) to MACEs was 7.78%, 4.69% of eGFR 45-59 ml/min·1.73m(2), 4.46% of eGFR 30-44 ml/min·1.73m(2), and 3.36% of eGFR<30 ml/min·1.73m(2). CONCLUSION: Compared with moderate to severe RI, mild RI has higher attributable risk to MACEs during hospitalization in Chinese ACS population. SUPPLEMENTARY INFORMATION: The online version contains supplementary material available at 10.1186/s12882-022-02663-4.