Association of Serial Biochemical Markers With Acute Ischemic Stroke

Abstract

Background and Purpose— Biochemical markers of acute neuronal injury may aid in the diagnosis and management of acute ischemic stroke. Serum samples from the National Institute for Neurological Disorders and Stroke (NINDS) recombinant tissue plasminogen activator Stroke Study were analyzed for the presence of 4 biochemical markers of neuronal, glial, and endothelial cell injury. These biochemical markers, myelin basic protein (MBP), neuron-specific enolase (NSE), S100β, and soluble thrombomodulin, were studied for an association with initial stroke severity, infarct volume, and functional outcome. Methods— In the original NINDS study, serum samples were drawn from all patients on presentation to the Emergency Department and at ≈2 and 24 hours after initiation of study therapy. In this analysis, stored serum samples were available for 359 patients; 107 patients had samples for all 3 time points. Serum marker concentrations were measured by ELISA techniques. We examined the relation between serum concentrations of each marker and the degree of baseline neurological deficit, functional outcome, and infarct size on computed tomography at 24 hours and the effect of fibrinolytic therapy. Results— Higher 24-hour peak concentrations of MBP, NSE, and S100β were associated with higher National Institutes of Health Stroke Scale baseline scores (r=0.186, Pr=0.117, P=0.032; and r=0.263, Pr=0.209, Pr=0.239, PPConclusions— This study corroborates previous work demonstrating correlations of MBP, NSE, and S100β with clinical and radiographic features in acute stroke. Despite significantly better outcomes in the tissue plasminogen activator–treated group, we found no difference in the early release of the 4 biomarkers between treatment groups. Further study will define the role of biomarkers in acute stroke management and prognostication.