Abstract
Small fiber neuropathy represents a significant component of diabetic sensorimotor polyneuropathy (DSPN) which has to date been ignored in most recommendations for the diagnosis of DSPN. Small fibers predominate in the peripheral nerve, serve crucial and highly clinically relevant functions such as pain, and regulate microvascular blood flow, mediating the mechanisms underlying foot ulceration. An increasing number of diagnostic tests have been developed to quantify small fiber damage. Because small fiber damage precedes large fiber damage, diagnostic tests for DSPN show good sensitivity but moderate specificity, because the gold standard which is used to define DSPN is large fiber-weighted. Hence new diagnostic algorithms for DSPN should acknowledge this emerging data and incorporate small fiber evaluation as a key measure in the diagnosis of DSPN, especially early neuropathy.
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