Background: We studied the influence of acute renal failure (ARF) on the relationship between N-terminal pro-B-type natriuretic peptide (NT-proBNP) and hemodynamic parameters.
Methods: The echocardiographic parameters and NT-proBNP levels were compared between 26 mechanically ventilated patients with ARF requiring continuous hemodiafiltration and 44 control patients.
Results: The relationships between NT-proBNP and left ventricular ejection fraction (p = 0.001), left ventricular end-diastolic volume (p = 0.03), tricuspid annular plane systolic excursion (p = 0.008), and pulmonary artery pressure (p = 0.01) were found only in the control group. The median and interquartile range of NT-proBNP (1,717.5, 389.5-4,138 ng/l) were significantly higher (p < 0.001) in the low diuresis subgroup than the levels (748.8, 384.2-2,217 ng/l) in the subgroup where daily diuresis increased and both had significantly higher levels than controls (350.7, 130.2-661.2 ng/l, p < 0.001).
Conclusion: The high levels of NT-proBNP >1,000 ng/l seem to be typical, particularly for oliguric ARF. It seems that ARF precludes its utilization for any hemodynamic diagnosis.
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