Blood Urea Nitrogen as a Prognostic Indicator in Heart Failure Management

Blood urea nitrogen (BUN) has emerged as a versatile biomarker in the risk stratification and management of patients with heart failure. Reflecting both renal function and neurohormonal activation, elevated BUN levels portend adverse haemodynamic status, renal hypoperfusion and heightened vasopressin-mediated urea reabsorption. In acute decompensated and chronic heart failure alike, BUN correlates with in-hospital, short-term and long-term mortality, often adding prognostic precision beyond traditional indices such as natriuretic peptides. Composite metrics—including the BUN/creatinine ratio and the BUN/albumin ratio—further refine prediction by integrating volume status, nutritional reserve and circulating protein levels. Incorporation of BUN into clinical scores can inform diuretic strategies, guide intensification of therapy and support timely discharge planning. Its broad availability and low cost render BUN particularly valuable in resource-limited settings, underscoring its global relevance in improving outcomes for patients with heart failure.

Research from Nature Portfolio

Recent work in intensive care cohorts has shown that the ratio of blood urea nitrogen to serum albumin offers incremental prognostic value in patients with severe coronary heart disease admitted to critical care. In a large retrospective cohort, rising BUN/albumin ratio was associated with stepwise increases in in-hospital, 28-day and one-year all-cause mortality, exhibiting non-linear threshold effects that may aid early identification of high-risk individuals. In elderly patients discharged after acute decompensated heart failure, baseline BUN retained independent predictive power for post-discharge mortality over a multi-year follow-up. Its discriminative performance approximated that of brain natriuretic peptide, with specific cut-off values offering practical utility for post-discharge surveillance and therapy optimisation.

Blood Urea Nitrogen as a Prognostic Indicator in Heart Failure Management publication trend

The graph below shows the total number of articles in blood urea nitrogen as a prognostic indicator in heart failure management across all publications each year (not limited to Nature Index journals).

Technical terms

Blood Urea Nitrogen (BUN): Measure of nitrogen derived from urea in the blood, indicating renal clearance and protein catabolism.
Albumin: Major plasma protein produced by the liver, serving as a marker of nutritional status and oncotic pressure.
Creatinine: Muscle-derived waste product routinely used to assess glomerular filtration rate.
BUN/creatinine ratio: Comparative metric of BUN relative to creatinine, employed to distinguish prerenal causes of azotaemia and assess volume status.
Acute decompensated heart failure (ADHF): Rapid worsening of heart failure symptoms necessitating urgent hospital care.
Neurohormonal activation: Pathophysiological cascade involving renin–angiotensin–aldosterone and vasopressin systems in heart failure.

References

1. Association of Blood Urea Nitrogen with Cardiovascular Diseases and All-Cause Mortality in USA Adults: Results from NHANES 1999–2006. Nutrients (2023).
2. Blood urea nitrogen to serum albumin ratio: a novel mortality indicator in intensive care unit patients with coronary heart disease. Scientific Reports (2024).
3. Blood urea nitrogen to creatinine ratio and long-term survival in patients with chronic heart failure. European Journal of Medical Research (2023).
4. Role of blood urea nitrogen in predicting the post-discharge prognosis in elderly patients with acute decompensated heart failure. Scientific Reports (2018).