Sustained heart rate-corrected QT prolongation during recovery from hypoglycaemia in people with type 1 diabetes, independently of recovery to hyperglycaemia or euglycaemia

Christine R Andreasen, Andreas Andersen, Per G Hagelqvist, Kaisar Maytham, Julius V Lauritsen, Susanne Engberg, Jens Faber, Ulrik Pedersen-Bjergaard, Filip K Knop, Tina Vilsbøll*

*Corresponding author af dette arbejde
5 Citationer (Scopus)

Abstract

AIM: To investigate changes in cardiac repolarization abnormalities (heart rate-corrected QT [QT c ] [primary endpoint], T-wave abnormalities) and heart-rate variability measures in people with type 1 diabetes during insulin-induced hypoglycaemia followed by recovery hyperglycaemia versus euglycaemia.

METHODS: In a randomized crossover study, 24 individuals with type 1 diabetes underwent two experimental clamps with three steady-state phases during electrocardiographic monitoring: (1) a 45-minute euglycaemic phase (5-8 mmol/L), (2) a 60-minute insulin-induced hypoglycaemic phase (2.5 mmol/L), and (3) 60-minute recovery in either hyperglycaemia (20 mmol/L) or euglycaemia (5-8 mmol/L).

RESULTS: All measured markers of arrhythmic risk indicated increased risk during hypoglycaemia. These findings were accompanied by a decrease in vagal tone during both hyperglycaemia and euglycaemia clamps. Compared with baseline, the QT c interval increased during hypoglycaemia, and 63% of the participants exhibited a peak QT c of more than 500 ms. The prolonged QT c interval was sustained during both recovery phases with no difference between recovery hyperglycaemia versus euglycaemia. During recovery, no change from baseline was observed in heart-rate variability measures.

CONCLUSIONS: In people with type 1 diabetes, insulin-induced hypoglycaemia prolongs cardiac repolarization, which is sustained during a 60-minute recovery period independently of recovery to hyperglycaemia or euglycaemia. Thus, vulnerability to serious cardiac arrhythmias and sudden cardiac death may extend beyond a hypoglycaemic event, regardless of hyperglycaemic or euglycaemic recovery.

OriginalsprogEngelsk
TidsskriftDiabetes, Obesity and Metabolism
Vol/bind25
Udgave nummer6
Sider (fra-til)1566-1575
Antal sider10
ISSN1462-8902
DOI
StatusUdgivet - jun. 2023

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