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Strength-duration properties in diabetic polyneuropathy.
Deniz Yerdelen1, Filiz Koç, Hilmi Uysal
1Department of Neurology, Cukurova University Faculty of Medicine, Adana, Turkey. yerdelend@gmail.com
Diabetes Research and Clinical Practice
|April 6, 2007
Summary
Diabetic polyneuropathy may increase median nerve axonal excitability, indicated by a longer strength-duration time constant (SDTC). This change in nerve function was observed in diabetic patients compared to healthy controls.
Area of Science:
- Neuroscience
- Clinical Electrophysiology
Background:
- Diabetic polyneuropathy is a common complication of diabetes mellitus.
- Axonal excitability, assessed by the strength-duration time constant (SDTC), reflects the biophysical properties of nerve membranes.
- SDTC may offer insights into sodium channel function in neuropathies.
Purpose of the Study:
- To investigate alterations in the median nerve's strength-duration time constant (SDTC) in patients with diabetic polyneuropathy.
- To correlate SDTC and rheobase with glycemic control in diabetic patients.
Main Methods:
- A case-control study involving 49 diabetic patients and 15 age-matched healthy controls.
- Measurement of median nerve strength-duration time constant (SDTC) and rheobase using electrophysiological techniques.
- Assessment of fasting glucose and HbA1c levels in diabetic participants.
Main Results:
- The mean SDTC was significantly higher in diabetic patients (384.5±97.9 µs) compared to controls (313.8±46.7 µs) (P=.009).
- Rheobase values showed a trend towards difference between groups (P=.066).
- No significant correlation was found between SDTC or rheobase and fasting glucose or HbA1c levels.
Conclusions:
- Diabetic polyneuropathy is associated with increased axonal excitability, as evidenced by a prolonged SDTC.
- These findings suggest potential alterations in sodium channel function in diabetic nerves.
- The study highlights SDTC as a potential biomarker for nerve dysfunction in diabetes, independent of glycemic control levels.
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