Abstract Body (Do not enter title and authors here): Introduction: Interleukin(IL)-1 blockade with anakinra dampens the inflammatory response and prevents heart failure (HF) events in patients with ST-elevation myocardial infarction (STEMI). The efficacy of anakinra according to the baseline renal function in STEMI has not been addressed.

Hypothesis: The efficacy of anakinra is independent of the baseline renal function.

Aim: To determine the effect of anakinra according to the baseline renal function in patients with STEMI.

Methods: We pooled patients with STEMI from 3 double-blind randomized clinical trials. Patients with estimated glomerular filtration rate (eGFR) <15 mL/min/1.73m2 were excluded. We divided the cohort based on the median baseline eGFR using the modified 2021 CKD-EPI equation (≥ or < 86 mL/min/1.73m2). We analyzed the area-under-the-curve for C-reactive protein (AUC-CRP) at 14 days, and the incidence of the composite outcome of all-cause death or new-onset HF at 1 year using the Log-rank test. We also evaluated the creatinine changes at 48-72 hours after percutaneous coronary intervention (PCI).

Results: We analyzed 139 patients, 110 (79%) males, 52 (37%) Black or African-American, with a median age of 56 [49–63] years. The AUC-CRP at 14 days was significantly higher in patients receiving placebo vs. anakinra both in those with eGFR <86 mL/min/1.73m2 (250.5[131.4-512.0] vs. 66.4[42.3-126.5] mg●day/L, p<0.001) and those with eGFR ≥86 mL/min/1.73m2 (214.2[113.6-303.4] vs. 86.4[35.9-194.3] mg●day/L, p<0.01). Anakinra significantly reduced the composite outcome of all-cause death or new-onset HF in patients with baseline eGFR <86 mL/min/1.73m2 (4/41 [9.8%] vs. 9/27 [33.3%], Log-rank p=0.024) as well as in patients with baseline eGFR ≥86 mL/min/1.73m2 (3/43 [6.9%] vs. 7/28 [25%], Log-rank p=0.038)(p=0.97 for interaction)(Figure). No differences in creatinine changes 48-72 hours after PCI were observed (0.01 [-0.10 to 0.15] mg/dL in anakinra vs. 0.01[-0.08 to 0.14] mg/dL in placebo; p=0.80).

Conclusion: In a cohort of patients with STEMI and mainly preserved or mildly reduced renal function, IL-1 blockade with anakinra blunts the acute inflammatory response and prevents all-cause death or new-onset HF at 1 year independent of baseline renal function.