Summary
OBJECTIVES: To define prevalence, long term outcome, and treatment standards of secondary mitral regurgitation (sMR) across the heart failure spectrum. DESIGN: Large scale cohort study. SETTING: Observational cohort study with data from the Viennese community healthcare provider network between 2010 and 2020, Austria. PARTICIPANTS: 13 223 patients with sMR across all heart failure subtypes. MAIN OUTCOME MEASURES: Association between sMR and mortality in patients assigned by guideline diagnostic criteria to one of three heart failure subtypes: reduced, mid-range, and preserved ejection fraction, was assessed. RESULTS: Severe sMR was diagnosed in 1317 patients (10%), correlated with increasing age (P<0.001), occurred across the entire spectrum of heart failure, and was most common in 656 (25
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