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Developmental apraxia arising from neonatal brachial plexus palsy.
T Brown1, C Cupido, H Scarfone
1Department of Medicine, Division of Neurology, McMaster University, Hamilton, Ontario, Canada.
Neurology
|July 13, 2000
Summary
Motor unit activation is impaired in children with persisting disability from neonatal brachial plexus palsy (NBPP). This points to defective motor programming as a likely cause of their ongoing challenges.
Area of Science:
- Neurology
- Pediatrics
- Rehabilitation Medicine
Background:
- Neonatal brachial plexus palsy (NBPP) patients exhibit more muscle reinnervation than clinical assessments suggest.
- Understanding the functional impact of NBPP is crucial for effective treatment.
Purpose of the Study:
- To investigate motor unit activation in patients with NBPP and persistent functional deficits.
- To identify the underlying physiological mechanisms contributing to disability in NBPP.
Main Methods:
- Assessed motor skills, maximal voluntary torque, twitch torque, and twitch interpolation in NBPP patients and controls.
- Measured maximal evoked muscle compound action potential (M-wave) amplitude in affected and unaffected limbs.
- Utilized physiologic investigations to compare motor unit function between groups.
Main Results:
- NBPP patients showed diminished motor skills and reduced voluntary torque relative to muscle activation potentials.
- Evidence of impaired motor unit activation, indicated by interpolated twitches, was observed in some NBPP patients.
- Control subjects did not exhibit interpolated twitches, highlighting a difference in motor control.
Conclusions:
- Impaired motor unit activation contributes significantly to persisting disability in NBPP.
- The findings suggest a potential link between defective motor programming in infancy and NBPP-related functional deficits.
- This research may inform targeted interventions for improving motor function in NBPP survivors.