Consistent effects of hypoglycemia on cognitive function in people with or without diabetes

Clementine E. M. Verhulst*, Therese W. Fabricius, Giesje Nefs, Roy P. C. Kessels, Frans Pouwer, Steven Teerenstra, Cees J. Tack, Melanie M. Broadley, Peter L. Kristensen, Rory J. McCrimmon, Simon Heller, Mark L. Evans, Ulrik Pedersen-Bjergaard, Bastiaan E. de Galan

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

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Abstract

Objective

Hypoglycemia poses an immediate threat for cognitive function. Due to its association with acute cognitive impairment, the International Hypoglycemia Study Group (IHSG) defines a blood glucose level

Research design and methods

Adults with type 1 diabetes with normal (n = 26) or impaired (n = 21) hypoglycemic awareness or with insulin-treated type 2 diabetes (n = 15) and age-matched control subjects without diabetes (n = 32) underwent a hyperinsulinemic-euglycemic-hypoglycemic glucose clamp (2.80 +/- 0.13 mmol/L [50.2 +/- 2.3 mg/dL]). At baseline and during hypoglycemia, calculation ability, attention, working memory and cognitive flexibility were measured with the Paced Auditory Serial Addition Test (PASAT) and the Test of Attentional Performance (TAP).

Results

For the whole group, hypoglycemia decreased the mean +/- SD proportion of correct answers on the PASAT by 8.4 +/- 12.8%, increased reaction time on the TAP Alertness task by 32.1 +/- 66.6 ms, and increased the sum of errors and omissions on the TAP Working Memory task by 2.0 +/- 5.5 (all P < 0.001). Hypoglycemia-induced cognitive declines were largely irrespective of the presence or type of diabetes, level of symptomatic awareness, diabetes duration, or HbA(1c).

Conclusions

IHSG level 2 hypoglycemia impairs cognitive function in people with and without diabetes, irrespective of type of diabetes or hypoglycemia awareness status. These findings support the cutoff value of hypoglycemia

Original languageEnglish
Pages (from-to)2103-2110
JournalDiabetes Care: The Journal of Clinical and Applied Research and Education
Volume45
Issue number9
DOIs
Publication statusPublished - Sept 2022

Keywords

  • IMPAIRED AWARENESS
  • SLEEP-DEPRIVATION
  • RECOVERY
  • SYMPTOMS

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