Dorsal sural sensory nerve action potential: A study for reference values

This is the authors' abstract. We don't add key points for this paper.

BACKGROUND: Dorsal sural sensory nerve action potential (SNAP) could help diagnose early or subclinical peripheral neuropathy. OBJECTIVES: To establish reference data for dorsal sural SNAP amplitude, latency, and velocity in healthy participants. MATERIALS AND METHODS: A prospective study was conducted in 45 nerves from healthy participants between 18 and 90 years and stratified into three age groups (a = 18-40 years, b = 41-60 years, and c>60 years). StataCorp 12.2 statistical program was used for all statistical analyses. Mean-2 standard deviation was used to generate reference values for the lower limit of amplitude and velocity in each age group. ANOVA with Bonferroni correction was used for intergroup comparisons of amplitude and velocity. Regression analysis was used to compute an equation for the predicted amplitude with age, height, and weight as the covariates. Age was the covariate with maximum effect on the dorsal sural amplitude. Gender and side-to-side comparison did not show statistical significance for amplitude and velocity measurements. Linear regression analysis of the transformed amplitude gave the predictive equation as (y) =3.338 + age (-0.0167) + height in meters (-0.209) + weight (0.001). CONCLUSION: This study provides reference data for dorsal sural SNAP in Indian population stratified by age.