Abstract
Fractional exhaled nitric oxide (FeNO) is recognized as a marker of endothelial function in pulmonary vascular bed in asthma, and is diminished in pulmonary arterial hypertension. Previous studies have reported increase in FeNO after exercise in symptomatic patients with heart failure (HF), yet direct comparison between rest and peak exercise FeNO as it relates to cardiopulmonary function has not been determined.
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