Association of Blood Urea Nitrogen With Incident Heart Failure in the Community　- The Atherosclerosis Risk in Communities (ARIC) Study.

Background: The association between blood urea nitrogen (BUN) levels and incident heart failure (HF) in the general population is still unclear.
Methods and Results: We assessed the association of BUN level with incident HF in 14,167 ARIC participants without a history of HF at baseline (1987-1989) (mean age 54.1 years, 54.4% female, 25.2% Black). BUN levels (mg/dL) were divided into quartiles, with the highest quartile further divided into tertiles (Q1 ≤13, Q2 13-15, Q3 15-17, Q4a 17-19, Q4b 19-21, Q4c >21). HF events were identified through to December 31, 2019, using diagnostic codes on discharge records or death certificates. Hazard ratios (HRs) were estimated using multivariable Cox models. During a median follow-up of 26.2 years, 3,482 participants developed HF (incidence rate 10.7 per 1,000 person-years). In a multivariable Cox model adjusted for sociodemographic variables, the highest BUN quartile (Q4) had a HR of 1.19 (95% confidence interval [CI] 1.09, 1.31) compared with Q1. HRs for Q4a, Q4b, and Q4c were 1.14 (95% CI 1.02, 1.28), 1.11 (0.96, 1.28), and 1.42 (1.22, 1.63), respectively. After further adjustment for clinical factors, the association remained significant for Q4c (HR 1.23 [1.06, 1.43]). Associations were consistent across demographic and clinical subgroups.
Conclusions: In this community-based cohort, higher BUN levels were significantly associated with incident HF. BUN, routinely measured in clinical care, may help identify individuals at risk of HF.