Prognostic significance of blood urea nitrogen/creatinine ratio in chronic HFpEF

Background The prognostic significance of blood urea nitrogen (BUN)/creatinine ratio specifically in chronic heart failure with preserved ejection fraction (HFpEF) patients remained unclear. We aimed to evaluate the association of BUN/creatinine ratio (baseline level and visit‐to‐visit variation) with the risk of adverse clinical outcomes among patients with chronic HFpEF. Methods and results This is a secondary analysis of the Treatment of Preserved Cardiac Function Heart Failure with an Aldosterone Antagonist (TOPCAT) trial. Of the enrolled 3445 participants in the TOPCAT trial, associations between BUN/creatinine and clinical outcomes were examined in a subset of 1521 (baseline measurements level) and 1453 (visit‐to‐visit variation) participants. A multivariable Cox proportional hazard model was used to assess the prognostic significance of BUN/creatinine ratio and BUN/creatinine ratio variation for the prespecified clinical outcomes. A higher BUN/creatinine ratio was associated with a higher risk of all‐cause mortality (hazard ratio [HR] = 1.52, 95%CI, 1.21‐1.91; p