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Summary
Diabetic subjects show slower nerve conduction and longer nerve signal delays, indicating spinal cord dysfunction. This subclinical electrophysiologic issue may contribute to sensory problems in the lower extremities.
Area of Science:
- Neuroscience
- Diabetology
- Electrophysiology
Background:
- Diabetes mellitus can affect the nervous system, leading to neuropathy.
- Subclinical neurological dysfunction in diabetes requires further investigation.
Purpose of the Study:
- To compare impulse conduction velocity in the peripheral nerve, spinal cord, and supraspinal pathways between diabetic individuals and healthy controls.
- To investigate the relationship between disease duration and electrophysiologic changes in diabetes.
Main Methods:
- Compared motor and sensory conduction velocities (CVs), F wave latencies, and somatosensory evoked potentials (SEPs) in 15 diabetic subjects and 15 controls.
- Estimated spinal somatosensory conduction velocity (SSCV) indirectly.
Main Results:
- Diabetic subjects exhibited slower motor and sensory CVs and longer latencies for F waves and SEPs (p < 0.001).
- Indirect SSCV was significantly slower in diabetics (39.4 m/sec) compared to controls (54.2 m/sec) (p < 0.001).
- Supraspinal conduction time (cervical cord to cortex) was similar between groups (p < 0.1).
Conclusions:
- Approximately 40% of diabetic subjects demonstrated subclinical electrophysiologic dysfunction in the spinal cord's posterior columns.
- This dysfunction is not fully explained by peripheral neuropathy, distal axonopathy, or primary diabetic myelopathy.
- Spinal cord dysfunction may contribute to the common lower-extremity sensory symptoms experienced by individuals with diabetes.