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Altered cortical inhibitory function in children with spastic diplegia: a TMS study
Julia Vry1, Michaela Linder-Lucht, Steffen Berweck
1Department of Paediatrics and Adolescent Medicine, Division of Neuropaediatrics and Muscular Disorders, University Hospital Freiburg, Mathildenstrasse 1, 79106 Freiburg, Germany. julia.vry@uniklinik-freiburg.de
Periventricular leukomalacia (PVL) in children with spastic diplegia is linked to reduced cortical inhibition, not corticospinal tract damage. Transcranial magnetic stimulation revealed shorter silent periods, indicating impaired cortical inhibitory function in PVL patients.
Area of Science:
- Neuroscience
- Developmental Neuroscience
- Pediatric Neurology
Background:
- Periventricular leukomalacia (PVL) is a primary cause of spastic diplegia in children.
- While corticospinal tract damage is implicated, cortical dysfunction may also contribute to PVL-associated movement disorders.
Purpose of the Study:
- To assess corticospinal tract integrity and cortical inhibitory function in children with PVL using transcranial magnetic stimulation (TMS).
- To investigate the role of cortical dysfunction in PVL and spastic diplegia.
Main Methods:
- Employed single-pulse TMS on 15 children with bilateral PVL and spastic diplegia and 22 healthy controls.
- Measured central motor conduction time and motor evoked potential amplitudes for corticospinal integrity.
- Assessed the postexcitatory silent period (SP) as a marker of cortical inhibitory interneuron function.
Main Results:
- Corticospinal tract integrity markers (conduction time, amplitudes) showed no significant differences between PVL patients and controls.
- The postexcitatory silent period (SP) was significantly shortened in children with PVL compared to controls (25.6 ms vs. 47.6 ms, P=0.018).
Conclusions:
- Reduced cortical inhibitory function, indicated by a shortened SP, suggests significant cortical involvement in PVL.
- This impairment may stem from dysfunctional cortical interneurons or altered thalamocortical/cortico-cortical inputs.
