4.6 Article

The Predictive Value of Dynamic Intrinsic Local Metrics in Transient Ischemic Attack

Journal

FRONTIERS IN AGING NEUROSCIENCE
Volume 13, Issue -, Pages -

Publisher

FRONTIERS MEDIA SA
DOI: 10.3389/fnagi.2021.808094

Keywords

resting-state fMRI; dynamic local metric; machine learning; support-vector machine; transient ischemic attack

Funding

  1. National Key R&D Program of China [2017YFC1310000]
  2. National Natural Science Foundation of China [81771911, 82001898]
  3. cultivation project of province leveled preponderant characteristic discipline in College of Education of Hangzhou Normal University [20JYXK026]
  4. Zhejiang Medical and Health Science and Technology Project [2021KY249]

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This study investigates the dynamic alterations in resting-state local metrics and their potential to differentiate patients with TIA from healthy controls. The results show that TIA is associated with disruptions in dynamic local intrinsic brain activities, and these dynamic local metrics can accurately distinguish TIA patients from healthy controls.
BackgroundTransient ischemic attack (TIA) is known as small stroke. However, the diagnosis of TIA is currently difficult due to the transient symptoms. Therefore, objective and reliable biomarkers are urgently needed in clinical practice. ObjectiveThe purpose of this study was to investigate whether dynamic alterations in resting-state local metrics could differentiate patients with TIA from healthy controls (HCs) using the support-vector machine (SVM) classification method. MethodsBy analyzing resting-state functional MRI (rs-fMRI) data from 48 patients with and 41 demographically matched HCs, we compared the group differences in three dynamic local metrics: dynamic amplitude of low-frequency fluctuation (d-ALFF), dynamic fractional amplitude of low-frequency fluctuation (d-fALFF), and dynamic regional homogeneity (d-ReHo). Furthermore, we selected the observed alterations in three dynamic local metrics as classification features to distinguish patients with TIA from HCs through SVM classifier. ResultsWe found that TIA was associated with disruptions in dynamic local intrinsic brain activities. Compared with HCs, the patients with TIA exhibited increased d-fALFF, d-fALFF, and d-ReHo in vermis, right calcarine, right middle temporal gyrus, opercular part of right inferior frontal gyrus, left calcarine, left occipital, and left temporal and cerebellum. These alternations in the dynamic local metrics exhibited an accuracy of 80.90%, sensitivity of 77.08%, specificity of 85.37%, precision of 86.05%, and area under curve of 0.8501 for distinguishing the patients from HCs. ConclusionOur findings may provide important evidence for understanding the neuropathology underlying TIA and strong support for the hypothesis that these local metrics have potential value in clinical diagnosis.

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