Abstract
Atrial fibrillation (AF) is a common comorbidity in patients with heart failure (HF) that may compromise cardiac contractility and exacerbate the HF syndrome.1 Multiple studies point to increased mortality in HF complicated by AF (compared to HF with sinus rhythm), regardless of the time of AF onset in relation to HF syndrome.2 Mortality rates for HF patients generally are greatest early after onset and tend to decrease with time elapsed since the diagnosis; however, whether the presence of AF alters such a clinical course is unknown.
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