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Similarity of the Impact of Type 1 and Type 2 Diabetes on Cardiovascular Mortality in Middle-Aged Subjects

¹ Kuopio University Hospital, Kuopio, Finland
² Department of Medicine, University of Kuopio, Kuopio, Finland
³ Turku University Central Hospital, Turku, Finland
⁴ Department of Medicine, University of Turku, Turku, Finland

Address correspondence and reprint requests to Markku Laakso, Academy Professor, University of Kuopio and Kuopio University Hospital, 70210 Kuopio, Finland. E-mail: markku.laakso{at}kuh.fi

OBJECTIVE—To compare the risk of cardiovascular disease (CVD) death and the impact of hyperglycemia on the risk of CVD mortality associated with type 1 diabetes to that associated with type 2 diabetes.

RESEARCH DESIGN AND METHODS—The study comprised 173 participants with type 1 diabetes, 834 participants with type 2 diabetes, and 1,294 nondiabetic participants, aged 45–64 years at baseline and free of CVD. The age of onset of diabetes was >30 years in both diabetic groups.

RESULTS—During an 18-year follow-up, 86 participants with type 1 diabetes, 567 participants with type 2 diabetes, and 252 nondiabetic participants died. CVD mortality rates per 1,000 person-years were 23.1 (95% CI 16.9–31.9) in type 1 diabetic, 35.3 (30.8–40.4) in type 2 diabetic, and 4.6 (3.8–5.7) in nondiabetic participants. Adjusted hazard ratios for CVD mortality in participants with type 1 diabetes versus no diabetes was 3.6 (95% CI 2.2–5.7) in men and 13.3 (6.9–22.5) in women and in participants with type 2 diabetes versus no diabetes 3.3 (2.5–4.5) in men and 10.1 (6.7–17.4) in women. An increment of 1 unit (%) of GHb increased CVD mortality by 52.5% (95% CI 28.4–81.3) in type 1 diabetic subjects and by 7.5% (4.3–10.8) in type 2 diabetic participants.

CONCLUSIONS—The impact of type 1 and type 2 diabetes on CVD mortality was similar. The effect of increasing hyperglycemia on the risk of CVD mortality was more profound in type 1 than in type 2 diabetic subjects.

Abbreviations: CHD, coronary heart disease • CVD, cardiovascular disease

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