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QTc interval and resting heart rate as long-term predictors of mortality in type 1 and type 2 diabetes mellitus: a 23-year follow-up

Stettler, C. ; Bearth, A. ; Allemann, S. ; Zwahlen, M. ; Zanchin, L. ; Deplazes, M. ; Christ, E. ; Teuscher, A. ; Diem, P.

In: Diabetologia, 2007, vol. 50, no. 1, p. 186-194

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    Titre
    • QTc interval and resting heart rate as long-term predictors of mortality in type 1 and type 2 diabetes mellitus: a 23-year follow-up
    Auteur
    • Stettler, C.. Division of Endocrinology and Diabetes, University of Bern, Inselspital, CH-3010, Bern, Switzerland
    • Bearth, A.. Division of Endocrinology and Diabetes, University of Bern, Inselspital, CH-3010, Bern, Switzerland
    • Allemann, S.. Division of Endocrinology and Diabetes, University of Bern, Inselspital, CH-3010, Bern, Switzerland
    • Zwahlen, M.. Division of Epidemiology and Biostatistics, Department of Social and Preventive Medicine, University of Bern, Bern, Switzerland
    • Zanchin, L.. Division of Cardiology, SRO Hospital, Langenthal, Switzerland
    • Deplazes, M.. Division of Endocrinology and Diabetes, University of Bern, Inselspital, CH-3010, Bern, Switzerland
    • Christ, E.. Division of Endocrinology and Diabetes, University of Bern, Inselspital, CH-3010, Bern, Switzerland
    • Teuscher, A.. Division of Endocrinology and Diabetes, University of Bern, Inselspital, CH-3010, Bern, Switzerland
    • Diem, P.. Division of Endocrinology and Diabetes, University of Bern, Inselspital, CH-3010, Bern, Switzerland
    Type de document
    • Postprint
    Identifiant OAI-PMH
    • oai:doc.rero.ch:316487
    Summary
    Aims/hypothesis: We evaluated the association of QT interval corrected for heart rate (QTc) and resting heart rate (rHR) with mortality (all-causes, cardiovascular, cardiac, and ischaemic heart disease) in subjects with type 1 and type 2 diabetes. Methods: We followed 523 diabetic patients (221 with type 1 diabetes, 302 with type 2 diabetes) who were recruited between 1974 and 1977 in Switzerland for the WHO Multinational Study of Vascular Disease in Diabetes. Duration of follow-up was 22.6 ± 0.6years. Causes of death were obtained from death certificates, hospital records, post-mortem reports, and additional information given by treating physicians. Results: In subjects with type 1 diabetes QTc, but not rHR, was associated with an increased risk of: (1) all-cause mortality (hazard ratio [HR] 1.10 per 10ms increase in QTc, 95% CI 1.02-1.20, p = 0.011); (2) mortality due to cardiovascular (HR 1.15, 1.02-1.31, p = 0.024); and (3) mortality due to cardiac disease (HR 1.19, 1.03-1.36, p = 0.016). Findings for subjects with type 2 diabetes were different: rHR, but not QTc was associated with mortality due to: (1) all causes (HR 1.31 per 10 beats per min, 95% CI 1.15-1.50, p < 0.001); (2) cardiovascular disease (HR 1.43, 1.18-1.73, p < 0.001); (3) cardiac disease (HR 1.45, 1.19-1.76, p < 0.001); and (4) ischaemic heart disease (HR 1.52, 1.21-1.90, p < 0.001). Effect modification of QTc by type 1 and rHR by type 2 diabetes was statistically significant (p < 0.05 for all terms of interaction). Conclusions/interpretation: QTc is associated with long-term mortality in subjects with type 1 diabetes, whereas rHR is related to increased mortality risk in subjects with type 2 diabetes