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Wallerian degeneration of the pyramidal tract does not affect stroke rehabilitation outcome
1Department of Neurology, Toneyama National Hospital, Toyonaka City, Osaka, Japan.
Objective:
To test whether Wallerian degeneration (WD) of the pyramidal tract as signaled by MRI affects rehabilitation outcome in patients with subcortical infarction (internal capsule or corona radiata).
Background:
Recent radiologic evidence suggests that WD occurs no earlier than 3 months after a subcortical infarction.
Methods:
A total of 77 consecutive patients with pure motor hemiparesis due to an initial subcortical infarction were assessed on admission and discharge with the Functional Independence Measure (FIM) for disability and Stroke Impairment Assessment Set (SIAS, full = 25) for impairment. WD was defined by a high-intensity area detected along the pyramidal tract below the level of lesion on T2-weighted MR image (WD+).
Results:
Age, sex, side of stroke, Mini-Mental State Examination score, and volume of lesion were comparable for each group. Length of stay (LOS) was significantly longer (p < 0.05) in WD+ (130 days) than in WD- (105 days). There was no difference in the change of FIM (WD+, 99 to 111; WD-, 95 to 107) or SIAS measures (WD+, 12 to 16; WD-, 13 to 16) made on admission and discharge, nor was there any effect of the timing of the rehabilitation experience (< or = 90 days or >90 days after stroke).
Conclusions:
After stroke, apparent WD of the pyramidal tract may slow functional recovery but does not limit final rehabilitation outcome of pure motor hemiparesis. Study of the mechanisms of compensation for this delayed pyramidal tract degeneration will enhance the scientific basis for rehabilitation.
Insights
Wallerian degeneration (WD) after stroke may slow recovery but does not impact final outcomes for pure motor hemiparesis. Further research into compensation mechanisms is needed to improve rehabilitation strategies.
Area of Science:
- Neuroscience
- Radiology
- Rehabilitation Medicine
Background:
- Wallerian degeneration (WD) is a process occurring after nerve damage.
- Radiological evidence indicates WD in the pyramidal tract appears after three months of subcortical infarction.
Purpose of the Study:
- To investigate if MRI-detected Wallerian degeneration (WD) of the pyramidal tract influences rehabilitation outcomes in patients with subcortical infarction.
- To assess the relationship between WD and functional recovery in patients with pure motor hemiparesis.
Main Methods:
- Seventy-seven patients with pure motor hemiparesis from subcortical infarction were evaluated.
- Functional Independence Measure (FIM) and Stroke Impairment Assessment Set (SIAS) were used for assessments.
- Wallerian degeneration (WD) was identified using T2-weighted MRI of the pyramidal tract.
Main Results:
- Patients with WD showed a significantly longer length of stay (130 days) compared to those without (105 days).
- No significant differences were observed in the improvement of FIM or SIAS scores between WD+ and WD- groups.
- Rehabilitation timing (≤90 days or >90 days post-stroke) did not affect outcomes.
Conclusions:
- Apparent Wallerian degeneration (WD) of the pyramidal tract after stroke may decelerate functional recovery but does not limit the final rehabilitation outcome for pure motor hemiparesis.
- Understanding the mechanisms of compensation for delayed pyramidal tract degeneration is crucial for advancing rehabilitation science.