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Background
Data regarding the impact of preheart failure (HF) comorbidities on the prognosis of HF are scarce, especially in the younger HF patients.
Objectives
To investigate pre‐existing comorbidities in HF patients versus matched controls and to assess their impact on mortality.
Methods
We included all first‐time in‐hospital and outpatient diagnoses of HF from 1995 to 2017, and comorbidities...