Corticospinal Tract Integrity and Long-Term Hand Function Prognosis in Patients With Stroke

Area of Science:

• Neuroscience
• Neurology
• Radiology

Background:

• Restoring hand function is crucial for stroke survivors.
• Assessing corticospinal tract (CST) integrity aids in predicting functional recovery.
• Understanding the relationship between CST integrity and hand function is vital for stroke rehabilitation.

Purpose of the Study:

• To investigate the correlation between CST integrity and hand function status 6 months post-stroke.
• To evaluate the predictive utility of fiber number (FN) and fractional anisotropy (FA) at different brainstem locations for hand function.
• To identify key diffusion tensor imaging (DTI) metrics for forecasting hand function restoration in stroke patients.

Main Methods:

• A retrospective cross-sectional study of 44 ambulatory stroke patients.
• Classification of hand function into no, partial, and full recovery groups.
• Diffusion tensor imaging (DTI) analysis at 6 months post-stroke, measuring FA at mid-pons and pontomedullary junction, and CST FN.

Main Results:

• Significant differences in normalized FN, FA (mid-pons), and FA (pontomedullary junction) were observed.
• Higher FA (mid-pons) values correlated with better hand function recovery (full > partial > no recovery).
• Normalized FA (mid-pons) demonstrated significant differences across all functional recovery groups.

Conclusions:

• CST integrity at 6 months post-stroke is significantly related to hand functional status.
• Mid-pons FA is a more potent predictor of hand function restoration than FN or pontomedullary junction FA.
• These findings can aid in predicting functional outcomes and understanding the long-term prognosis for hand function after stroke.