Abstract
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Highlights
● The lowest SRAR value in healthy adults was 0.20
● The SRAR had no relationship with by age, sex, weight, height, or BMI.
● The SRAR had no relationship with forearm length, wrist, leg, or ankle circumference.
● The SRAR supports early axonal polyneuropathy diagnosis.
● The SRAR is a robust diagnostic index for polyneuropathy.
Plain Language Summary
One way doctors assess nerve health is through special electrical tests. A common test examines the sural nerve, located in the leg, but its results can vary widely, making it challenging to identify early problems. To improve this, doctors often use the sural-to-radial sensory nerve action potential amplitude ratio (SRAR). This ratio compares the electrical signal from the sural nerve in the leg to the radial nerve in the arm, which is usually less affected by common nerve disorders. Our study examined 108 healthy adults, aged 20-70, to determine what the normal SRAR value and assess whether factors such as age, sex, height, weight, body shape, or limb measurements influence it or not. We found that the lowest normal SRAR value was 0.20. Importantly, our research showed that this ratio remained consistent regardless of age, sex, weight, height, or even the size of their forearms, wrists, legs, or ankles. Since SRAR is a stable and reliable measure, unaffected by a person's individual characteristics, it can be a more dependable tool for diagnosing early nerve damage, especially axonal polyneuropathy. This means doctors can use the SRAR more confidently to identify nerve problems sooner, potentially leading to earlier treatment and better outcomes for patients at risk of or experiencing polyneuropathy. Our findings help simplify the interpretation of this important diagnostic test, making it more practical for widespread use.