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Article Abstract
Objective: To determine the temporal profiles of glial fibrillary acidic protein (GFAP), neurofilament light (NFL), total tau (t-tau), and ubiquitin carboxy-terminal hydrolase L1 (UCHL1) in plasma the first week after acute ischemic stroke, and identify the optimal time points for assessing infarct volume by these biomarkers.
Patients & Methods: In this cohort study, biomarker plasma concentrations were determined daily over the first week and at 90 days after symptom onset in patients with acute ischemic stroke. A brain MRI was performed on day three. Temporal variations in biomarker levels were analyzed using linear mixed-effects models, and optimal time points for infarct volume correlation were identified with continuous Pearson analysis.
Results: 38 patients with a median age of 78 (IQR 72-86) and mean infarct volume of 5.5 (IQR 1.6-17) cm were included. We identified three distinct temporal patterns: (1) a parabolic trajectory of GFAP, reaching zenith after three days, (2) a consistent increase in NFL throughout the week, and (3) an initial surge in t-tau and UCHL1 levels, stabilizing by day three. The optimal time point for infarct volume correlation occurred at 119 h for GFAP (r = 0.94, 95% CI: [0.84-0.98]), 144 h for NFL (r = 0.78, [0.47, 0.92]), 122 h for t-tau (r = 0.82, [0.56, 0.93]) and 113 h for UCHL1 (r = 0.83, [0.60, 0.93]).
Interpretation: This high-resolution serial sampling of plasma GFAP, NFL, t-tau, and UCHL1 the first week after acute ischemic stroke identified three distinct temporal profiles. These biomarkers provided the most accurate infarct volume assessment 4-6 days after symptom onset.
Clinicaltrials: gov NCT03812666 (registration date 2019-01-23).
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