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Somatosensory evoked potentials to posterior tibial nerve stimulation in children
Insights
Somatosensory evoked potentials (SEPs) in children show variable maturation, especially in infants under one year. The ascending time of the major positive wave (P) is a reliable indicator of thalamo-cortical maturation in pediatric patients.
Area of Science:
- Neuroscience
- Pediatric Neurology
- Developmental Neuroscience
Background:
- Somatosensory evoked potentials (SEPs) are crucial for assessing the integrity of the somatosensory nervous system.
- Understanding SEP maturation in children is vital for diagnosing neurological conditions.
- Tibial nerve stimulation provides a valuable method for evaluating lower limb somatosensory pathways.
Purpose of the Study:
- To investigate the maturation patterns of SEPs elicited by tibial nerve stimulation in children aged 1 day to 16 years.
- To identify age-related changes and variability in SEP parameters.
- To assess the clinical utility of these SEPs in pediatric neurology.
Main Methods:
- Studied 88 children aged 1 day to 16 years, recording SEPs from tibial nerve stimulation.
- Analyzed parameters including onset latency, peak latency, and ascending time of the major positive wave (P).
- Compared findings with SEPs from upper limb stimulation and correlated parameters with age and body size.
Main Results:
- SEPs were not consistently observed in infants under 1 year old.
- Onset and peak latencies of the major positive wave (P) were highly variable across subjects and electrode placements.
- The ascending time of wave P demonstrated a strong correlation with age, showing the lowest values around 3 years old.
Conclusions:
- Peripheral somatosensory pathway maturation outpaces central pathway maturation.
- Upper limb somatosensory pathway maturation precedes lower limb maturation.
- The ascending time of wave P serves as a reliable index for thalamo-cortical maturation in pediatric assessments.
Abstract:
The somatosensory evoked potentials (SEPs) to stimulation of the tibial nerve were studied in 88 children ranging in age from 1 day to 16 years. SEPs were not evidenced in 10 out of 44 infants less than 1 year old. In others it was a major positive wave (P) with a variable topographic distribution on the midline. The onset and peak latencies of this P were highly variable in different subjects of the same age or body-size, and in the same subject with the active electrode placed in different locations. The lowest values for latency were in subjects about 3 years old. The ascending time of P was the only parameter strictly correlated with age. The results are compared with SEPs to upper limb stimulation, which are constant and more reliable. These results indicate: that the maturation of the peripheral somatosensory pathway proceeds at a faster rate than that of the central somatosensory pathway; that the maturation of the somatosensory pathway of the upper limb precedes that of the lower limb; and that the ascending time of P is a good index of thalamo-cortical maturation. The clinical utility of these SEPs in pediatrics is discussed.