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Short latency somatosensory-evoked potentials in children--Part 2. Effects of spinovertebral disorders
Insights
Somatosensory-evoked potentials (SEPs) can detect sensory pathway issues in pediatric spinal disorders. However, SEP abnormalities are not consistently found in patients with motor or sphincteric dysfunction, limiting their clinical utility.
Area of Science:
- Pediatric Neurology
- Neurophysiology
Background:
- Spinal cord disorders in children present diverse neurological challenges.
- Somatosensory-evoked potentials (SEPs) are used to assess the integrity of somatosensory pathways.
Purpose of the Study:
- To evaluate the utility of SEPs in diagnosing spinal cord pathology in pediatric patients.
- To correlate SEP findings with clinical manifestations in children with spinal disorders.
Main Methods:
- Surface-recorded spinal and cortical SEPs were obtained following tibial or median nerve stimulation in 26 children (12 months to 13 years).
- Patients had various spinal malformations, tumors, syringomyelia, stenosis, or demyelinating syndromes.
- SEP results were correlated with clinical assessments of sensory, motor, and sphincteric function.
Main Results:
- Abnormal SEPs were identified in 13 out of 26 patients.
- The most frequent abnormality was the loss of SEPs at or proximal to the spinal lesion.
- Only four patients showed prolonged central conduction times or delayed peak latencies.
- Abnormal SEPs consistently correlated with sensory deficits, while motor/sphincteric dysfunction with intact sensation usually yielded normal SEPs.
Conclusions:
- SEP studies provide valuable insights into somatosensory pathway integrity in pediatric spinal disorders.
- The clinical utility of SEPs for assessing overall spinal cord function in children is limited by technical, clinical, and anatomical factors.
- SEPs are more sensitive to sensory pathway involvement than motor or sphincteric dysfunction in this population.
Abstract:
Surface-recorded spinal and cortical somatosensory-evoked potentials (SEPs) following tibial or median nerve stimulation were studied in 26 children aged from 12 months to 13 years. Fifteen patients had caudal or dysraphic spinal malformations, often with a tethered cord syndrome, while the remaining patients had spinal tumors (4), syringomyelia (3), spinal canal stenosis (2), or demyelinating syndromes (2). Somatosensory-evoked potential abnormalities were found in 13 patients. Loss of a SEP at or rostral to the site of spinal pathology was the most common finding. Prolongation of central conduction times or delay in SEP peak latencies was documented in only four patients. Correlations between clinical and electrophysiological findings revealed that all patients with sensory dysfunction had abnormal SEPs, whereas patients with motor or sphincteric dysfunction, but intact sensation, usually had normal SEPs. These relationships between SEPs and clinical findings were constant irrespective of the etiology and location of the spinal pathology. The results from this study suggest that although SEP studies provide information regarding the somatosensory pathways, their clinical utility as a method of assessing spinal cord function in children with spinal disorders is limited by technical, clinical, and anatomical factors.