Abstract
INTRODUCTION: Mitral regurgitation (MR) is the second most common valve disease in Europe with an increasing prevalence, causing a significant healthcare burden and impacting quality of life. Despite its clinical importance, real-world data on MR burden are limited. OBJECTIVES: This study aimed to estimate MR prevalence, describe patient profiles, and assess healthcare resource utilization and related costs, stratified by degenerative (DMR) and functional (FMR) aetiologies, using real-world data from Italy. METHODS: A retrospective study using Italy's Hospital Discharge Records was conducted including patients discharged in 2018 with a diagnosis of MR. The cohort was stratified into degenerative (DMR) and functional MR (FMR) based on comorbidities and clinical criteria. Patients were followed for 12 months to assess interventions received, including surgical (SMVr) and transcatheter mitral valve repair (TMVr), as well as length of stay, in-hospital mortality, and associated costs. RESULTS: In 2018, 5816 patients who met the eligibility criteria were hospitalised with MR (83.6% DMR, 16.4% FMR). Among DMR patients, 44.2% underwent isolated valve repair (89.7% SMVr, 10.3% TMVr), while 29.1% of FMR patients received repair (59.6% SMVr, 40.4% TMVr). TMVr patients were older (DMR: 41.6%, FMR: 42.9% aged ≥75 years) and had more comorbidities. Untreated patients had higher 1-year in-hospital mortality (DMR: 4.7%, FMR: 8.5%) compared to treated groups and the highest reintervention rate at 1 year (DMR: 19.9%, FMR: 13.3%). Re-intervention rates were lower in DMR (SMVr: 0.4%, TMVr: 0%) versus FMR (SMVr: 0.6%, TMVr: 0.9%). The cost differences between interventions were negligible, primarily reflecting the different DRG tariffs applied for each intervention type. CONCLUSIONS: Untreated MR is associated with worse clinical outcomes and higher long-term resource use. These findings support early intervention strategies and highlight the need to improve access to care, especially for high-risk populations. Further studies are warranted to explore outpatient care and address treatment disparities.