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KMID : 0359719990170030389
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Journal of the Korean Neurological Association
1999 Volume.17 No. 3 p.389 ~ p.393
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Delayed Central Conduction Time on Brainstem Auditory Evoked Potential Pathway in Diabetic Patients -Functional Origin? or Structural Origin?-
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Kim Sung-Min
Kwon Ki-Han
Lee Byung-Chul
Um Keun-Yong
Bae Jong-Seok
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Abstract
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Background: It has been well known that absolute and interpeak latencies of brainstem auditory evoked potentials (BAEP) are usually prolonged in diabetics. However, Its etiology is still controversial. We tried to identify whether the cause is structural or metabolic in origin by performing BAEP and brain MRI in the diabetic patients.
Methods: BAEP were performed in both file diabetic patients(DM) group(16 males and 15 females) and the normal control group (25 and 33 female). A brain MRI was performed in the DM group on those who showed abnormal BAEP and compared the results of BAEP of the BM group with those of the control group.
Results: 7 patients (22.6%) showed abnormal BAEP (male; 6, female; 1, unilateral; 4, bilateral; 3) when abnormal BAEP was defined as being larger than two and a half standard deviations of the control group BAEP results. Two males of the DM group who showed abnormal structural lesions of the pons in their brain MRI were not included in the statistical analysis. The remaining 14 diabetic male patients (mean age: 58.7±9.1 years, mean disease duration : 6.1±4.7 years, means hemoglobin(Hb) A1C: 7.7 ±2.0%) and 15 diabetic female patients(mean age : 6.6±10.8 years, mean disease
durgation: 5.4±5.1 years, mean HgA1C: 7.8±2.1%) were stastistically analyzed. Interpeak latencies of Ⅰ-Ⅲ, Ⅲ-Ⅴ, and Ⅰ-Ⅴ were found to be significantly prolonged in the DM group. The prolongation of interpeak latencies of Ⅰ-Ⅲ and Ⅰ-Ⅴ were found to be significantly correlated with the disease duration only in the diabetic female patients, but not with age and HbA1c.
Conclusions: These findings suggest that both metabolic derangement and structural lesion contribute to prolonging central conduction time on BAEP pathway in diabetics.
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KEYWORD
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Brainstem auditory evoked potential, Diabetes mellitus, Magnetic resonance image
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