TY - JOUR

T1 - Hypoglycemia-associated changes in the electroencephalogram in patients with type 1 diabetes and normal hypoglycemia awareness or unawareness

AU - Sejling, Anne-Sophie

AU - Kjær, Troels W

AU - Pedersen-Bjergaard, Ulrik

AU - Diemar, Sarah S

AU - Frandsen, Christian S S

AU - Hilsted, Linda

AU - Faber, Jens

AU - Holst, Jens Juul

AU - Tarnow, Lise

AU - Nielsen, Martin N

AU - Remvig, Line S

AU - Thorsteinsson, Birger

AU - Juhl, Claus B

N1 - © 2014 by the American Diabetes Association. Readers may use this article as long as the work is properly cited, the use is educational and not for profit, and the work is not altered.

PY - 2015/5

Y1 - 2015/5

N2 - Hypoglycemia is associated with increased activity in the low-frequency bands in the electroencephalogram (EEG). We investigated whether hypoglycemia awareness and unawareness are associated with different hypoglycemia-associated EEG changes in patients with type 1 diabetes.Twenty-four patients participated in the study; 10 with normal hypoglycemia awareness and 14 with hypoglycemia unawareness. The patients were studied at normoglycemia (5-6 mmol/l), hypoglycemia (2.0-2.5 mmol/l) and during recovery (5-6 mmol/l) by hyperinsulinemic glucose clamp. During each one-hour period, EEG, cognitive function and hypoglycemia symptom scores were recorded and the counterregulatory hormonal response was measured.Quantitative EEG analysis showed that the absolute amplitude of the theta band and alpha-theta band up to doubled during hypoglycemia with no difference between the two groups. In the recovery period the theta amplitude remained increased. Cognitive function declined equally during hypoglycemia in both groups and during recovery reaction time was still prolonged in a subset of tests. The aware group reported higher hypoglycemia symptom scores and had higher epinephrine and cortisol responses compared to the unaware group.In patients with type 1 diabetes, EEG changes and cognitive performance during hypoglycemia are not affected by awareness status during a single insulin-induced episode with hypoglycemia.

AB - Hypoglycemia is associated with increased activity in the low-frequency bands in the electroencephalogram (EEG). We investigated whether hypoglycemia awareness and unawareness are associated with different hypoglycemia-associated EEG changes in patients with type 1 diabetes.Twenty-four patients participated in the study; 10 with normal hypoglycemia awareness and 14 with hypoglycemia unawareness. The patients were studied at normoglycemia (5-6 mmol/l), hypoglycemia (2.0-2.5 mmol/l) and during recovery (5-6 mmol/l) by hyperinsulinemic glucose clamp. During each one-hour period, EEG, cognitive function and hypoglycemia symptom scores were recorded and the counterregulatory hormonal response was measured.Quantitative EEG analysis showed that the absolute amplitude of the theta band and alpha-theta band up to doubled during hypoglycemia with no difference between the two groups. In the recovery period the theta amplitude remained increased. Cognitive function declined equally during hypoglycemia in both groups and during recovery reaction time was still prolonged in a subset of tests. The aware group reported higher hypoglycemia symptom scores and had higher epinephrine and cortisol responses compared to the unaware group.In patients with type 1 diabetes, EEG changes and cognitive performance during hypoglycemia are not affected by awareness status during a single insulin-induced episode with hypoglycemia.

U2 - 10.2337/db14-1359

DO - 10.2337/db14-1359

M3 - Journal article

C2 - 25488900

VL - 64

SP - 1760

EP - 1769

JO - Diabetes

JF - Diabetes

SN - 0012-1797

IS - 5

ER -