Neurophysiological changes during hypoglycaemia in type 1 (insulin- dependent) diabetes mellitus and in normal man

G. Tallroth, M. Lindgren, Georg Stenberg, Ingmar Rosén, C. D. Agardh

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92 Citations (Scopus)

Abstract

Hypoglycaemia (median venous blood glucose 1.8 mmol/l; range 1.6-2.3) was induced by an intravenous infusion of regular insulin in eight patients with Type 1 (insulin-dependent) diabetes mellitus (age 28.0 +/- 7.4 years; mean +/- SD, duration 15.5 +/- 5.1 years) and in 12 age- matched healthy male control subjects. Multi-channel frequency analysis of electroencephalogram (electrophysiologic brain mapping) and recording of P300 and somatosensory evoked potentials were performed before, during and immediately after the hypoglycaemic period. The hypoglycaemia produced a significant increase in low frequency electroencephalographic activity in both groups, most pronounced over anterior regions of the brain. The electroencephalographic activity was normalised immediately after the hypoglycaemic period. The patients with diabetes showed somewhat longer P300 latencies during the initial normoglycaemic examination. Hypoglycaemia caused a marked reduction of the P300 amplitude in both groups of subjects and the amplitude was not restored immediately after normalisation of blood glucose levels. The somatosensory cortical responses were not affected by hypoglycaemia. We conclude that hypoglycaemia results in impairment in cerebral function, as measured by neurophysiological techniques, which is not immediately normalised when blood glucose is restored to normal.

Original languageEnglish
Pages (from-to)319-323
Number of pages4
JournalDiabetologia
Volume33
Issue number5
DOIs
Publication statusPublished - 1990
Externally publishedYes

Swedish Standard Keywords

  • Medical and Health Sciences (3)

Keywords

  • Adult
  • Blood Glucose/metabolism
  • Brain/drug effects/physiology/*physiopathology
  • Comparative Study
  • Diabetes Mellitus
  • Electroencephalography
  • Human
  • Hypoglycemia/chemically induced/*physiopathology
  • Insulin-Dependent/*physiopathology
  • Insulin/*pharmacology
  • Male
  • Non-U.S. Gov't
  • Reference Values
  • Support

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