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Cognitive dysfunction in NIDDM: P3 event related evoked potential study.

O P Tandon1, A Verma, B K Ram

  • 1Department of Physiology, University College of Medical Sciences, Delhi.

Indian Journal of Physiology and Pharmacology
|April 25, 2000
PubMed
Summary

Cognitive function is delayed in non-insulin dependent diabetes mellitus (NIDDM) patients with poor blood glucose control. Event-related evoked potentials show significantly prolonged N2 and P3 latencies in these individuals.

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Area of Science:

  • Neuroscience
  • Clinical Electrophysiology
  • Endocrinology

Background:

  • Assessing higher brain functions requires objective methods.
  • Endogenous cerebral evoked responses offer quantitative insights.
  • Non-insulin dependent diabetes mellitus (NIDDM) can impact cognitive function.

Purpose of the Study:

  • To investigate cognitive function in NIDDM patients using event-related evoked potentials.
  • To compare cognitive electrophysiological measures between NIDDM patients and healthy controls.

Main Methods:

  • Auditory 'oddball' paradigm used to elicit event-related evoked potentials.
  • P3 component of the endogenous cerebral evoked response measured.
  • Peak latencies of N2 and P3 components compared between NIDDM patients and controls.

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Main Results:

  • NIDDM patients exhibited significantly prolonged N2 (248.0 +/- 36.3 ms) and P3 (391.6 +/- 49.9 ms) latencies compared to controls (N2=220.6 +/- 26.4 ms, P3=326.2 +/- 26.8 ms).
  • The observed differences in latencies were highly statistically significant (P < 0.001).
  • No correlation found between disease duration, blood glucose levels, or physical parameters and N2/P3 latencies or amplitude.

Conclusions:

  • Electrophysiological evidence suggests delayed cognitive processing in poorly controlled NIDDM.
  • Event-related evoked potentials are sensitive indicators of cognitive impairment in diabetes.
  • Further research may explore interventions to mitigate cognitive delays in NIDDM.