Type 1 diabetes is associated with T-wave morphology changes. The Thousand & 1 Study
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Updated: Feb 7, 2026
A Protocol for Constructing a Rat Wound Model of Type 1 Diabetes
Published on: February 17, 2023
Jonas L Isaksen1, Claus Graff2, Christina Ellervik3
1Laboratory of Experimental Cardiology, Department of Biomedical Sciences, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark; Department of Health Science and Technology, Aalborg University, Aalborg, Denmark.
Background:
Repolarization is impaired in patients with type 1 diabetes mellitus (T1DM), and repolarization disturbances are associated with an increased mortality. To study cardiac repolarization, we assessed T-wave morphology in patients with T1DM without known heart disease.
Methods:
855 T1DM patients without known heart disease were matched 1:2 with 1710 people from a background population. Rate-corrected T-wave morphology markers were obtained. Patients were stratified by albuminuria. Results are mean ± standard deviation.
Results:
T-waves were flatter (0.398 ± 0.059 vs. 0.382 ± 0.062, p < 0.001) and more asymmetric (0.082 ± 0.068 vs. 0.071 ± 0.084, p = 0.001) in T1DM. Patients with albuminuria had an increased heart rate (normoalbuminuria: 71 ± 13 bpm, microalbuminuria: 75 ± 12 bpm, p < 0.001, macroalbuminuria: 78 ± 12 bpm, p < 0.001) and more asymmetric T-waves (normoalbuminuria: 0.079 ± 0.060, microalbuminuria: 0.094 ± 0.085, p < 0.01, macroalbuminuria: 0.101 ± 0.080, p < 0.01), but the QTc interval remained unchanged.
Conclusions:
T1DM is associated with changes in T-wave morphology. T-wave asymmetry but not QTc interval is associated with albuminuria in T1DM and may be used for stratification.
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