Impact of the COVID-19 Pandemic on Surgical Outcomes of Native and Prosthetic Valve Endocarditis: A Retrospective Subanalysis

Background and aim of the study: During the COVID-19 pandemic in Bavaria, surgical ICU resources were reallocated, and elective procedures were postponed, impacting the management of infective endocarditis (IE). This study evaluated early surgical outcomes in patients with native valve endocarditis (NVE) and prosthetic valve endocarditis (PVE) before and during the pandemic. Methods: We retrospectively analyzed 94 patients (66% male) treated pre-pandemic (August 2018–March 21, 2020) and 84 patients (76% male) treated during the pandemic (March 22, 2020–November 2021). NVE cases comprised 78% pre-pandemic and 68% during the pandemic, while PVE cases increased from 22% to 32%. Preoperative characteristics, surgical urgency, postoperative complications, and in-hospital mortality were assessed. Explanted valves underwent histological, microbiological, and molecular analyses, including fluorescence in situ hybridization (FISH) with 16S rRNA PCR/sequencing. Results: During the pandemic, preoperative NYHA class III-IV increased significantly (NVE: 49% to 74%; PVE: 29% to 70%; all p<0.05). Urgent surgeries became more frequent (NVE: 27% to 49%, p=0.017; PVE: 20% to 52%, p=0.034), and the interval from diagnosis to surgery in PVE patients was prolonged (11 vs. 16 days, p=0.038). More complex procedures, including double-valve surgeries, were required (9.5% vs. 37%, p=0.022). Postoperatively, re-thoracotomy rates increased in NVE cases (OR: 9.106, p<0.001), while odds ratios for stroke, sepsis, and prolonged ICU stay in PVE patients trended higher but lacked statistical significance. Conclusion: The pandemic led to diagnostic delays, worsened preoperative conditions, and increased surgical urgency in IE patients, underscoring the need for resilient healthcare strategies to maintain timely surgical care during future crises.