Abstract 4117731: Interleukin-1 Blockade in Patients With ST-Segment Elevation Myocardial Infarction Across the Spectrum of Coronary Artery Disease Complexity.

Background: Patients with ST-segment elevation myocardial infarction (STEMI) and complex coronary artery disease (CAD) face a poor prognosis, including increased heart failure (HF) risk. Interleukin-1 (IL-1) blockade with Anakinra inhibits the acute inflammatory response and prevent HF after STEMI, but data on its effects based on CAD complexity are lacking. Aims: To assess the effects of Anakinra in patients with STEMI, across the spectrum of CAD complexity. Methods: We performed a pooled secondary analysis of 139 patients with STEMI from three randomized clinical trials (VCUART studies) comparing Anakinra (N=84) versus placebo (N=55). Multivessel CAD was defined as the presence of at least one ≥70% stenosis in a non-culprit vessel of >2.5 mm diameter, not stented during index coronary intervention. The SYNTAX (Synergy Between Percutaneous Coronary Intervention with Taxus and Cardiac Surgery), SYNTAX II and Gensini scores were calculated, and patients were divided by the median. We evaluated a composite endpoint of new-onset HF, HF hospitalization, or all-cause death at 1-year follow-up using Kaplan-Meier survival curves, Cox regression analysis for Hazard Ratios, and calculated interactions between groups. Results: We included 139 patients with STEMI, 85 (61%) with single vessel CAD and 54 (39%) with multivessel CAD. According to the spectrum of CAD complexity, 60 (43%) presented a SYNTAX score >9, 59 (42%) a SYNTAX II score >24 and 65 (47%) a Gensini score >32. New-onset HF, HF hospitalization, or all-cause death occurred in a total of 23 patients: 7 among the 84 subjects in the Anakinra group and 16 within the 55 patients in the placebo group. We found no statistically significant interactions between CAD complexity and allocation to Anakinra or placebo for the composite endpoint (Figure). Conclusions: Among patients with STEMI, IL-1 blockade with Anakinra significantly reduced the risk of new-onset HF, HF hospitalization, or all-cause death compared to placebo, regardless of the number of vessels affected and the spectrum of CAD complexity.