Glycemic Control and Peripheral Nerve Conduction in Children and Young Adults After 5–6 Mo of IDDM

OBJECTIVE: A cohort of people (n = 86) was examined in the first few months after insulin-dependent diabetes mellitus (IDDM) diagnosis to evaluate the effect of hyperglycemia on nerve conduction velocities and latencies. RESEARCH DESIGN AND METHODS: Unselected cases with IDDM, who were 6-29 yr of age, were identified at diagnosis from a large, geographically defined area of southern Wisconsin. Peripheral nerve conduction was measured on a sample from this cohort. RESULTS: Peroneal nerve conduction velocity was significantly inversely related to glycosylated hemoglobin (P less than 0.05, age and height adjusted). All other nerve conduction velocities and latencies (median motor, median sensory, and sural) showed the same tendency, but the associations were not statistically significant. Twenty-four-hour urine C-peptide and duration of diabetes (3-11 mo) were not consistently related to nerve conduction parameters after controlling for age and height. CONCLUSIONS: These findings suggest that as early as 5-6 mo after diabetes diagnosis, and at a time frequently characterized by partial remission of IDDM, hyperglycemia has a role in the acute slowing of nerve conduction velocity. Other factors such as residual endogenous insulin production do not appear to influence these early changes.