Preliminary data on the potential usefulness of B-type natriuretic peptide levels in predicting outcome after hospital discharge in patients with heart failure

Abstract

Purpose Among patients admitted for treatment of heart failure, we aimed to evaluate the value of B-type natriuretic peptide levels in predicting subsequent death or hospital readmission. Subjects and methods We observed and followed 50 consecutive patients admitted with decompensated heart failure. B-type natriuretic peptide levels were measured using an immunofluorometric assay at admission and at discharge. We followed patients for 6 months and ascertained readmissions for cardiovascular causes and death. Results Forty-three patients were discharged. There were 20 events during follow-up (15 readmissions and 5 deaths). Mean (± SD) B-type natriuretic peptide levels decreased during the initial hospitalization, from 619 ± 491 pg/mL to 328 ± 314 pg/mL (P <0.001) among patients who were event free during follow-up, whereas declines were less marked among patients with hospital readmission or death (from 779 ± 608 pg/mL to 643 ± 465 pg/mL, P = 0.08). Among the 7 patients with in-hospital increases in B-type natriuretic peptide level, 6 had events, compared with 14 of the 36 patients whose levels declined (P = 0.04). An increase in B-type natriuretic peptide levels during hospital stay was associated with an increased event rate (hazard ratio [HR] = 3.3; 95% confidence interval [CI]: 1.3 to 8.8). Patients whose B-type natriuretic peptide level at discharge was above the median (321 pg/mL) had a somewhat higher rate of dying or being readmitted (HR = 2.3; 95% CI: 0.9 to 5.8). Conclusion These preliminary results in a small number of patients suggest that changes in B-type natriuretic peptide levels, as well as predischarge levels, are related to hospital readmission and death within 6 months.