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Sequential activation brain mapping after subcortical stroke: changes in hemispheric balance and recovery
C Calautti1, F Leroy, J Y Guincestre
1INSERM U320 and University Hospital, Caen, France.
Neuroreport
|December 14, 2001
Summary
Brain recovery after subcortical stroke shows variable hemispheric activation shifts. Maintaining activation balance in the affected hemisphere over time is linked to better motor function recovery in stroke patients.
Area of Science:
- Neuroscience
- Neurology
- Rehabilitation Medicine
Background:
- Subcortical stroke impacts the cortico-spinal tract, crucial for motor control.
- Motor recovery after stroke is a complex process influenced by brain plasticity.
- Understanding hemispheric functional changes is key to improving stroke rehabilitation.
Purpose of the Study:
- To investigate changes in brain activation patterns during recovery from subcortical stroke.
- To correlate these activation changes with the degree of motor function recovery.
- To explore the role of hemispheric activation balance in subcortical stroke outcomes.
Main Methods:
- Prospective study of 5 patients recovering from left-sided subcortical stroke.
- Repeated H(2)(15)O-PET scans over several months during a hand motor task.
- Assessment of motor recovery using thumb-to-index tapping speed.
Main Results:
- Hemispheric activation balance showed a tendency to shift towards the unaffected hemisphere over time.
- The magnitude of this shift varied significantly between patients.
- The degree of shift in activation balance was significantly correlated with motor recovery outcomes.
Conclusions:
- A shift in activation balance towards the unaffected hemisphere is associated with less initial motor recovery.
- Preserving physiological activation balance over time correlates with better recovery after subcortical stroke.
- Hemispheric functional reorganization patterns offer insights into subcortical stroke recovery trajectories.