Clinical and Inflammatory Determinants of Heart Failure Severity Following Myocardial Infarction: Implications for Post-Infarction Care

Background: Post-infarction heart failure (HF) remains a major contributor to morbidity and mortality despite advances in reperfusion and pharmacological management. However, the combined influence of clinical background, myocardial injury, neuro-hormonal activation, and angiographic disease on HF severity is not fully defined. Methods: We retrospectively analyzed 181 patients with confirmed myocardial infarction treated in a tertiary cardiology center. Demographics, cardiovascular risk factors, prior chronic HF, inflammatory markers (CRP, fibrinogen, ESR, leukocyte indices), and high-sensitivity troponin (hs-Tn) were measured at admission (pre-intervention), immediately after percutaneous coronary intervention (PCI), and at 48 h, angiographic lesion distributions were collected. HF severity was graded on a five-level scale and further dichotomized as no/mild HF (grade 0–1) versus moderate–severe HF (grade ≥ 2). Group comparisons and multivariable logistic regression were used to identify independent determinants of severe HF. Results: Moderate–severe HF occurred in 42.5% of patients (77/181). Compared to HF 0–1, the HF ≥ 2 group was older (64.0 vs. 60.5 years, p = 0.042) and exhibited substantially higher systemic inflammation (CRP 41.5 vs. 9.75 mg/L, p < 0.001; fibrinogen 435 vs. 346 mg/dL, p = 0.0002; ESR 28 vs. 18 mm/h, p = 0.0004). hs-Tn levels and NT-proBNP were significantly elevated in HF ≥ 2 (NT-proBNP 3449 vs. 1243 pg/mL, p = 0.0003), while left ventricular ejection fraction was reduced. Prior HF increased the likelihood of HF ≥ 2 (54.5% vs. 33.7%, p = 0.0078), and conservative therapy was associated with adverse outcomes (87.5% vs. 40.5%, p = 0.0235). In multivariable analysis, NT-proBNP remained the only independent predictor of moderate–severe HF, while CRP showed a positive but non-significant trend after adjustment. Conclusions: Post-MI HF severity reflects the combined influence of myocardial injury, neurohormonal stress, and systemic inflammatory activation. However, in multivariable analysis, NT-proBNP emerged as the dominant independent predictor of moderate–severe HF, while CRP reflected an associated but non-independent inflammatory signal.