Aim: This study evaluated the impact of hyperuricemia (HUR) on outcome in patients with different types of impaired renal function (IRF) and acute myocardial infarction (AMI) treated invasively. Methods: Out of 3,593 consecutive AMI patients treated invasively, 1,015 IRF patients were selected. The IRF group consisted of patients with baseline kidney dysfunction (BKD group) and/or patients with contrast-induced nephropathy (CIN group). HUR was defined as a serum uric acid concentration (SUAC) >420 µmol/l (>7 mg/dl). Independent predictors of death and major adverse cardiovascular events (MACE) were selected by the multivariate Cox-regression model. Results: Remote mortality rates were higher in HUR patients: IRF (32.7 vs. 18.6%), BKD (41.3 vs. 25.9%), CIN (35.4 vs. 16.7%); all p < 0.001. HUR was an independent predictor of death in BKD (hazard ratio (HR) 1.38, p < 0.05). Each 100-µmol/l increase in SUAC was associated with a significant increase of HR for mortality: 1.087 in IRF patients, 1.108 in BKD patients, 1.128 in CIN patients; all p < 0.05. Remote major adverse cardiovascular event rates were higher in HUR patients: IRF (55.4 vs. 48.9%), CIN (56.8 vs. 48%); both p < 0.05. Conclusions: In AMI patients treated invasively, an increase in SUAC is an independent predictor of death within all types of renal dysfunction; HUR defined as SUAC >420 µmol/l (>7 mg/dl) is a predictor only in BKD patients.

Keywords:
Acute myocardial infarction, Hyperuricemia, Percutaneous coronary intervention, Kidney dysfunction, Contrast-induced nephropathy
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