Nerve Conduction Abnormalities in Pre-Diabetics and Asymptomatic Diabetics

Area of Science:

• Neurology
• Diabetology
• Electrophysiology

Background:

• Distal symmetric polyneuropathy (DSP) is a common complication of diabetes.
• Early detection of DSP is crucial for timely intervention and management.
• Pre-diabetics may already exhibit subclinical electrophysiological abnormalities.

Purpose of the Study:

• To identify electrophysiological abnormalities in pre-diabetics and asymptomatic diabetics.
• To evaluate the utility of nerve conduction studies in recognizing DSP in these populations.

Main Methods:

• A study involving 180 subjects categorized into healthy controls, pre-diabetics, and asymptomatic type 2 diabetics.
• Electrophysiological assessments including sural nerve sensory nerve action potential (SNAP) and tibial nerve compound motor action potential (CMAP) were performed.

Main Results:

• Significantly lower amplitudes of sural SNAP and tibial CMAP were observed in pre-diabetics and asymptomatic diabetics compared to controls.
• Increased F wave latency was noted in both pre-diabetic and asymptomatic diabetic groups, more pronounced in the latter.
• Distal latency and nerve conduction velocity showed no statistically significant differences.

Conclusions:

• Sensory nerve abnormalities, specifically reduced SNAP amplitude, are more apparent in pre-diabetics than motor nerve abnormalities.
• Motor nerve amplitude changes manifest later, becoming significant in asymptomatic diabetics.
• SNAP amplitude and F wave latency are the most sensitive indicators of peripheral neuropathy in early diabetes.