Movement analysis in neonates with spina bifida aperta.

Area of Science:

• Neuroscience
• Developmental Biology
• Pediatric Neurology

Background:

• Neonates with spina bifida aperta (SBA) exhibit transient leg movements caudal to the meningomyelocele (MMC).
• The relationship between these movements and functional neural conduction through the MMC is not well understood.
• Understanding this pathophysiology is crucial for optimizing therapeutic interventions.

Purpose of the Study:

• To determine if transient leg movements in neonates with SBA indicate functional neural conduction through the MMC.
• To investigate the integrity of the reflex arc in spinal segments caudal to the MMC.

Main Methods:

• Longitudinal analysis of fetuses and neonates with SBA (n=20) for concurrency between leg movements and general movements (GMs).
• Assessment of tendon leg reflexes in the first postnatal week to evaluate reflex arc integrity.
• Comparison of leg movement characteristics (duration, concurrency with GMs) over time.

Main Results:

• Leg movements caudal to the MMC concurred with GMs in 12/13 neonates on postnatal day 1.
• Concurrent leg movements were significantly longer than isolated movements (11s vs. 2s).
• Tendon leg reflexes disappeared by day 7 in most neonates, yet concurrent leg movements persisted, albeit with reduced duration.

Conclusions:

• Leg movements caudal to the MMC in neonates with SBA are indicative of functional neural conduction through the MMC.
• The disappearance of these movements is attributed to lower motor neuron dysfunction within the reflex arc.
• Neural conduction through the MMC remains functional despite reflex arc impairment.