Prognostic value of pro-adrenomedullin and NT-proBNP in patients referred from the emergency department with influenza syndrome.

Objectives: To assess the prognostic value of procalcitonin (PTC), C-reactive protein (CRP), N-terminal prohormone of brain natriuretic peptide (NT-proBNP), and mid-regional pro-adrenomedullin (MR-proADM) in patients with influenza syndrome.

Material And Methods: Prospective study in patients admitted from the emergency department with influenza syndrome. Biomarker concentrations were measured in the first 24 h after admission and a test for influenza. The results were analyzed for ability to predict a hospital stay longer than 7 days, intensive care unit admission, or in-hospital death.

Results: Ninety-eight patients were included; the prognosis of 44 (44.9%) was classified as poor. The areas under the receiving operator characteristic curve were 0.68 (95% CI, 0.56-0.80) for NT-proBNP, 0.73 (95% CI, 0.62-0.84) for MR-proADM, and nonsignificant for PCT and CRP. The following variables were independently associated with a poor prognosis: pneumonia (OR, 7.46 [95% CI, 2.08-26.73]; P=.002), heart failure (OR, 5.16 [95% CI, 1.35-19.74]; P=.016), and NT-proBNP > 580 pg/mL (OR, 4.68 [95% CI, 1.53-14.26]; P=.006). In the 53 patients with confirmed A(H1N1) influenza, only NT-proBNP was an independent predictor of prognosis (adjusted OR, 5.75 [95% CI, 1.46- 22.61]; P=.012).

Conclusion: NT-proBNP and MR-proADM were the only biomarkers with prognostic value. Only NT-proBNP was a useful predictor in patients with confirmed influenza.