Abstract Body (Do not enter title and authors here): Background: Systemic inflammatory response syndrome (SIRS) following cardiovascular interventions is associated with adverse events during hospitalization and follow-up. Mitral transcatheter edge-to-edge repair (M-TEER) is increasingly utilized for treatment of mitral regurgitation (MR).
Hypothesis: It is unknown whether SIRS following M-TEER may occur and be associated with adverse clinical outcomes.
Goals: to investigate the frequency and impact of SIRS following M-TEER on major cardiovascular events (MACE) and MR recurrence.
Methods: A total of 158 consecutive patients with severe MR undergoing M-TEER were studied. SIRS was defined by leukocytosis (≥12×10⁹/L) and fever (T≥38 °C) within 48 hours after intervention. Baseline inflammation was measured by absolute neutrophil and lymphocyte counts and neutrophil: lymphocyte ratio (NLR). The primary endpoint of MACE was the composite of non-fatal myocardial infarction (MI), non-fatal stroke, and all-cause death. Recurrent MR at follow-up was also recorded.
Results: The mean patient age was 80.8±8.8 years. 44 (27.9%) developed SIRS. NLR correlated with onset of leukocytosis and fever (p=0.04). During a median follow-up of 12.5±8.2 months, the primary endpoint occurred in 27 (17.1%) patients (6 MI, 5 strokes and 16 deaths). Patients with SIRS more often had severe MR (79.5% vs. 62.7%, p=0.02) and adverse left ventricular (LV) remodeling indicated by lack of reduction in end-diastolic diameter (LVEDD) at follow-up (p=0.12 for SIRS-patients vs. p=0.0012 for non-SIRS patients). After adjustment for pertinent variables, SIRS (HR 3.24, CI 1.13-9.31, p=0.03) was independently associated with MACE.
Conclusion: SIRS after M-TEER is a strong independent predictor of MACE. Closer follow-up is warranted as patients with SIRS have more severe MR and unfavorable LV remodeling at follow-up.