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J Electrodiagn Neuromuscul Dis > Volume 21(2); 2019 > Article
J Korean Assoc EMG Electrodiagn Med 2019;21(2):61-68.
DOI: https://doi.org/10.18214/jkaem.2019.21.2.61    Published online December 31, 2019.
The Determinant for N20 Latency of Somatosensory Evoked Potentials in Infants
Received: 5 October 2019   • Revised: 25 October 2019   • Accepted: 29 October 2019
Objective:To obtain the reference value of N20 latency of median and ulnar nerve somatosensory-evoked potentials (SEPs) in infants. Method: Medical data from infants diagnosed with lumbosacral lipomyelomeningocele who underwent SEP analysis were reviewed retrospectively. Multiple regression analyses were performed to determine the factors that affect N20 latency of median and ulnar nerves (N20median and N20ulnar) considering age, weight, total arm length, upper arm length, and forearm length. Pearson’s correlation analysis was performed between N20 latencies and upper arm length. Results: Total arm length (p < 0.01; p < 0.01), upper arm length (p < 0.001; p < 0.01), and forearm length (p < 0.01; p < 0.01) contributed to N20median and N20ulnar in simple regression analyses. Upper arm length (p < 0.001; p < 0.01) was the only contributing factor for N20median and N20ulnar following multiple regression analyses. The regression equations for estimating N20 latencies in infants from upper arm length were N20median = -0.47 × upper arm length + 22.53 (R2 = 0.21) and N20ulnar = -0.46 × upper arm length + 22.66 (R2 = 0.19). Conclusion: Upper arm length was negatively correlated with N20 latency of upper extremity SEPs in infants. The equations derived from the medical data can be clinically applied as references for infant SEPs.
Key Words: infant, median nerve, ulnar nerve, somatosensory-evoked potentials, reference values


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