Gestational Diabetes and Risk of CVD in Women

Study Questions:

Is there an increased risk of cardiovascular disease (CVD) among women with prior gestational diabetes mellitus (GDM) that is independent of the increased risk of developing type 2 diabetes?

Methods:

This systematic review and meta-analysis included observational studies that evaluated the association between GDM and CVD from 1950 through August 2018. A random-effects model was used to assess the predictive value of GDM for future CVD. Meta-regression models were followed by sensitivity analyses restricted to women with prior GDM who did not develop type 2 diabetes. CVD included CV events defined as fatal or nonfatal ischemic heart disease or cerebrovascular events.

Results:

Nine studies were included with data from 5,390,591 women (101,424 CV events). Women with GDM had a twofold higher risk of CVD (relative risk [RR], 1.98; 95% confidence interval [CI], 1.57-2.50) and meta-regression analysis showed that this risk was not affected by rates of incident type 2 diabetes (p = 0.34). Women who did not develop type 2 diabetes remained at increased risk of CVD with RR 1.56 (95% CI, 1.04-2.32). Within the first 10 years postpartum, GDM conferred a 2.3-fold risk of CVD (RR, 2.32; 95% CI, 1.57-3.39).

Conclusions:

Women with GDM have a twofold higher risk of CV events. The risk is not dependent upon the development of type 2 diabetes and is apparent within the first decade postpartum.

Perspective:

Pregnancy provides a unique window to identify women with underlying predisposition to metabolic derangements or subclinical endothelial dysfunction that places them at increased risk for CVD. This study confirms the association between GDM during pregnancy and the increased risk of subsequent CVD. Importantly, this risk is not dependent on the development of type 2 diabetes and the risk is apparent within the first decade. Women with hyperglycemia during pregnancy should be informed that GDM represents a risk factor for CVD as well as diabetes, and would likely benefit from regular ongoing primary care, acknowledging that the absolute risk of CVD in young women remains low overall. Physicians should also include pregnancy-related risk factors such as GDM, as well as pre-eclampsia, when assessing CVD risk factors. The main questions that remain are: 1) what screening and follow-up would be appropriate, and 2) is there an effective intervention that would prevent the development of vascular disease in women at increased risk? While we await further research for these important questions, this study is an important first step in raising awareness of the association between GDM and subsequent CVD.

Clinical Topics: Prevention, Atherosclerotic Disease (CAD/PAD)

Keywords: Cardiovascular Diseases, Coronary Artery Disease, Diabetes Mellitus, Type 2, Diabetes, Gestational, Hyperglycemia, Postpartum Period, Pre-Eclampsia, Primary Prevention, Risk Factors, Vascular Diseases, Women


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