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BUN as a risk factor for mortality after coronary artery bypass grafting
A J Hartz1, E M Kuhn, K L Kayser
1Department of Family and Community Medicine, Medical College of Wisconsin, Milwaukee 53226, USA.
Insights
Blood urea nitrogen (BUN) is a significant predictor of mortality in patients undergoing coronary artery bypass grafting (CABG). Elevated BUN levels, even after adjusting for other risk factors, indicate increased mortality risk.
Area of Science:
- Cardiology
- Nephrology
- Medical Statistics
Background:
- Blood urea nitrogen (BUN) is routinely measured in patients undergoing coronary artery bypass grafting (CABG).
- BUN has been underutilized as a predictor of mortality in CABG patients.
- This study investigates BUN as an independent risk factor for mortality post-CABG.
Purpose of the Study:
- To evaluate the association between blood urea nitrogen (BUN) levels and mortality in patients undergoing coronary artery bypass grafting (CABG).
- To determine if BUN provides incremental predictive value for mortality beyond established risk factors.
Main Methods:
- Analysis of four distinct patient datasets with varying information.
- Logistic regression modeling was employed to assess the relationship between BUN and mortality.
- Adjustments were made for multiple confounding risk factors, including creatinine levels.
Main Results:
- Blood urea nitrogen (BUN) demonstrated a strong association with mortality across all datasets.
- Patients with BUN > 30 mg/dL exhibited a 1.86 to 2.49 increased odds of mortality (p < 0.0001).
- BUN remained a statistically significant predictor of mortality (p < 0.01) even after adjusting for creatinine and other variables.
Conclusions:
- Blood urea nitrogen (BUN) offers valuable prognostic information regarding cardiac function.
- BUN serves as an independent risk factor for mortality in CABG patients.
- Integrating BUN assessment can enhance risk stratification for CABG patients.
Background:
Although information on blood urea nitrogen (BUN) is universally available for patients who undergo coronary artery bypass grafting, BUN has not often been considered as a risk factor for mortality. This study assessed BUN as a risk factor for CABG patients.
Methods:
Four data sets were evaluated that differed with respect to the types of patients and available patient information. In each of these data sets logistic regression analysis was used to examine the relationship between BUN and mortality after adjusting for other risk factors.
Results:
Blood urea nitrogen level was strongly associated with mortality in each of the data sets. After adjustment for the available risk factors other than creatinine level, patients with BUN levels greater than 30 mg/dL had a relative odds of mortality ranging between 1.86 and 2.49 (p < 0.0001 in three of the data sets). Even after adjustment for creatinine level as well as the other variables, BUN was statistically significant at the p less than 0.01 level for three of the data sets.
Conclusions:
The results suggest that BUN provides additional information on cardiac function that supplements the information provided by other risk factors.