4.7 Article

Dose-dependent effect of smoking on risk of coronary heart disease, heart failure and stroke in individuals with type 1 diabetes

Journal

DIABETOLOGIA
Volume 61, Issue 12, Pages 2580-2589

Publisher

SPRINGER
DOI: 10.1007/s00125-018-4725-9

Keywords

Cardiovascular disease; Coronary heart disease; Heart failure; Smoking; Stroke; Type 1 diabetes

Funding

  1. Folkhalsan Research Foundation
  2. Academy of Finland [134379]
  3. Wilhelm and Else Stockmann Foundation
  4. Diabetes Research Foundation
  5. Liv och Halsa Foundation
  6. Finska Lakaresallskapet
  7. Novo Nordisk Foundation
  8. Signe and Ane Gyllenberg Foundation
  9. Paivikki and Sakari Sohlberg Foundation
  10. Academy of Finland (AKA) [134379, 134379] Funding Source: Academy of Finland (AKA)

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Aims/hypothesisThe aim of this study was to assess the potential dose-dependent effects of smoking on the risk of CHD, heart failure and stroke in individuals with type 1 diabetes.MethodsThe study included 4506 individuals with type 1 diabetes who were participating in the Finnish Diabetic Nephropathy (FinnDiane) study. Intensity of smoking was estimated by packs per day and cumulative smoking by pack-years. Cox regression analyses were used to estimate the risk of incident CHD, heart failure or stroke during follow-up.ResultsOne pack per day significantly increased the risk of incident CHD in current smokers compared with never smokers (HR 1.45 [95% CI 1.15, 1.84]), after adjustment for age, sex, HbA(1c), hypertension, duration of diabetes and BMI. The risk of CHD in former smokers was similar to the risk in never smokers. The risk of incident heart failure was 1.43 (95% CI 1.03, 1.97) in current smokers per one pack per day and 1.37 (95% CI 1.05, 1.77) in former smokers, while the risk of incident stroke was 1.70 (95% CI 1.26, 2.29) and 1.49 (95% CI 1.14, 1.93), respectively. After further adjustments for lipids, however, the difference in the risk of heart failure in current and former smokers was no longer significant. Cumulative smoking data were similar to smoking intensity data.Conclusions/interpretationThere is a dose-dependent association between smoking and cardiovascular disease in individuals with type 1 diabetes. In men in particular, the risk of incident stroke remains high even after smoking cessation and is increased in current and former smokers independently of other risk factors.

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