Plasma N-terminal pro-brain natriuretic peptide concentrations may help to identify patients with very low-risk acute pulmonary embolism: A preliminary study

Background.Patients with an acute pulmonary embolism (APE) are a heterogeneous group, and some of them may benefit from early discharge and an ambulatory care referral.We aimed to evaluate the use of N-terminal pro-brain natriuretic peptide (NT-proBNP) plasma level assessment in patients with low-risk APE based on clinical findings (0 points on the simplified Pulmonary Embolism Severity Index (sPESI)). Materials and methods.Preliminary analysis of an ongoing prospective study including 1,151 normotensive patients with at least a segmental APE.In the final analysis, 348 patients with a 0-point sPESI were included.Blood samples were collected within the first 24 h of admission.The clinical endpoint (CE) included APE-related mortality and/or rescue thrombolysis in patients with clinical deterioration.Results.Clinical endpoints occurred in 3 patients who had higher plasma NT-proBNP levels than study participants with a favorable clinical course (164 [64-650] pg/mL compared to 2, 930 [2,285.5-13,965]pg/mL; p = 0.01).Receiver operating characteristic (ROC) analysis showed that the area under the curve (AUC) for NT-proBNP for the prediction of the CEs was 0.918 (95% confidence interval [95% CI]: 0.831-1.00;p = 0.013).We defined the cutoff value of NT-proBNP at ≥1,641 pg/mL.Conclusions.Among subjects with 0 points on the sPESI, those with concentrations of NT-proBNP exceeding 1,641 pg/mL might require closer attention; remaining patients could be considered candidates for outpatient treatment.However, these findings warrant further investigation in a large, prospective group of patients.