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Intra-operative evoked potential studies of newborn infants with myelomeningocele
Insights
Somatosensory evoked potentials in infants with myelomeningocele reveal intact neural pathways to the cortex. This suggests the neural plaque can be preserved during surgical repair, maintaining sensory connections.
Area of Science:
- Neuroscience
- Pediatric Surgery
- Evoked Potentials
Background:
- Myelomeningocele repair in infants requires careful surgical technique.
- Anesthetics can suppress somatosensory evoked potentials (SEPs), complicating intraoperative monitoring.
Purpose of the Study:
- To investigate the integrity of somatosensory pathways in infants undergoing myelomeningocele repair.
- To assess the utility of SEPs for preserving neural function during surgery.
Main Methods:
- Studied somatosensory evoked potentials in seven infants during myelomeningocele repair.
- Used narcotics and muscle relaxants for anesthesia to minimize SEP suppression.
- Stimulated median nerves, peroneal nerves, and the neural plaque to record cortical responses.
Main Results:
- Cortical responses were observed from median nerve stimulation before dissection in five infants.
- Peroneal nerve stimulation of the neural plaque yielded responses in five infants post-dissection.
- Distal lumbar-root stimulation produced low-amplitude, delayed cortical responses in two infants.
Conclusions:
- Distal nerves and the neural plaque in myelomeningocele infants may possess intact afferent cortical connections.
- Findings support meticulous preservation of the neural plaque during surgical repair to maintain sensory pathways.
Abstract:
Somatosensory evoked potentials were studied in seven infants during surgery for repair of thoraco-lumbar myelomeningocele. All were operated on during the first 24 hours of life. Because anaesthetics were known to suppress somatosensory evoked potentials, narcotics and muscle relaxants were used for anesthesia. Before surgical dissection, stimulation of median nerves evoked cortical responses in five of the seven patients. After dissection, evoked potentials could be retrieved from the neural plaque with peroneal nerve stimulation in five of the seven infants. Stimulation of the neural plaque produced cortical responses in five of the seven but cortical responses with long latencies could be obtained from peroneal nerve stimulation in only two of the seven patients. In two patients lumbar-root stimulation distal to the plaque produced low-amplitude and delayed-latency cortical responses. These findings indicate that the distal nerves and neural plaque may have intact afferent connections with the cortex: therefore at surgical repair the neural plaque has been meticulously preserved.