European Heart Journal Advance Access originally published online on February 20, 2009
European Heart Journal 2009 30(11):1372-1377; doi:10.1093/eurheartj/ehp039
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Glycaemic control in newly diagnosed diabetes patients and mortality from ischaemic heart disease: 20-year follow-up of the HUNT Study in Norway
1 Department of Circulation and Medical Imaging, Norwegian University of Science and Technology, Trondheim, Norway
2 Department of Public Health, Norwegian University of Science and Technology, Trondheim, Norway
3 Human Movement Science Program, Norwegian University of Science and Technology, Trondheim, Norway
4 Department of Cardiology, St Olav’s Hospital, Olav Kyrres gate 17, N-7030 Trondheim, Norway
5 International Agency for Research on Cancer, Lyon, France
Received 15 January 2009; revised 18 December 2008; accepted 16 January 2009; online publish-ahead-of-print 20 February 2009.
* Corresponding author. Tel: +47 90 11 52 45; Fax: +47 73 86 79 66, Email: ane.c.dale{at}ntnu.no
See page 1301 for the editorial comment on this article (doi:10.1093/eurheartj/ehp168)
Aims: To assess the influence of glycaemic control on long-term mortality from ischaemic heart disease (IHD) in patients with newly diagnosed diabetes.
Methods and results: In a large population study in Norway, people 
40 years with non-fasting glucose 8 mmol/L were invited to a fasting glucose test, and if the fasting value was <7 mmol/L, an oral glucose tolerance test was also performed. Among people who were diagnosed with diabetes, 205 patients were followed with annual measurements of HbA1c in order to monitor glycaemic control. Stratified Cox regression analysis was used to compare IHD mortality rates during 20 years of follow-up, with comparison of newly diagnosed diabetes patients and a matched group of 205 individuals without diabetes. Among patients, we also assessed the relation of HbA1c with IHD mortality. After adjustment for potentially confounding factors, IHD mortality in the total diabetes group was substantially higher (HR 1.8, 95% CI, 1.0–.3.4) compared with the comparison group. However, the increased risk was particularly high in patients with HbA1c in the highest quartile (HR 4.2, 95% CI, 2.1–8.1). Analysing HbA1c as a continuous time-varying variable showed 30% (HR 1.3, CI 1.1–1.5) higher risk per increment of HbA1c among diabetes patients without known CVD at baseline.
Conclusion: Poor long-term glycaemic control is associated with a substantial increase in the risk of dying from IHD in patients with diabetes, whereas in patients with reasonably good control, risk of dying from IHD may not substantially differ from that of people without diabetes.
Key Words: Diabetes mellitus • Mortality • Ischemic heart diseases • Follow-up • Glycaemic control
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