Gestational diabetes and the risk of cardiovascular disease in women: a systematic review and meta-analysis

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Abstract

Women who develop gestational diabetes mellitus (GDM) have an elevated lifetime risk of type 2 diabetes mellitus. Recently, a series of studies has suggested that women with GDM also have an increased risk of cardiovascular disease (CVD). However, it is unclear if this risk is dependent upon the intercurrent development of type 2 diabetes. Thus, we conducted a systematic review and meta-analysis to evaluate the impact of GDM on future risk of incident CVD and to ascertain the role of type 2 diabetes in this regard.

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Diabetes and cardiovascular disease. The "common soil" hypothesis.

M Stern (1995)

Unlike classical microvascular complications, large-vessel atherosclerosis can precede the development of diabetes, suggesting that rather than atherosclerosis being a complication of diabetes, both conditions have common genetic and environmental antecedents, i.e., they spring from a "common soil." It is now known that adverse environmental conditions, perhaps related to less-than-optimal nutrition, in fetal and early life are associated with an enhanced risk of both diabetes and cardiovascular disease many decades later. These same adverse environmental conditions are also associated with the development in adult life of abdominal obesity and the insulin-resistance syndrome (IRS). The IRS consists of glucose intolerance, hyperinsulinemia, dyslipidemia (high triglyceride and low high-density lipoprotein [HDL] cholesterol levels), and hypertension. Although the mechanism underlying this cluster is controversial, the statistical association is well established. All of the elements of the IRS have been documented as risk factors for type II diabetes. Some, but not all, of these elements are also cardiovascular disease risk factors, in particular, hypertension and low HDL cholesterol. Other factors associated with the IRS that may enhance cardiovascular disease risk are plasminogen activator inhibitor 1 and small, dense low-density lipoprotein particles. Whether insulin itself is a risk factor remains controversial, but recent epidemiological evidence has been mostly negative. This question has marked clinical relevance because if the IRS enhances cardiovascular disease risk by virtue of its concomitant factors and not the hyperinsulinemia per se, this would tend to alleviate concerns that intensive insulin management of type II diabetic subjects could enhance the risk of large-vessel atherosclerosis. Clinical trials are urgently needed to settle this point.

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Increased risk of ischemic heart disease, hypertension, and type 2 diabetes in women with previous gestational diabetes mellitus, a target group in general practice for preventive interventions: A population-based cohort study

Barbara Daly, Konstantinos Toulis, Neil Thomas … (2018)

Background Gestational diabetes mellitus (GDM) is associated with developing type 2 diabetes, but very few studies have examined its effect on developing cardiovascular disease. Methods and findings We conducted a retrospective cohort study utilizing a large primary care database in the United Kingdom. From 1 February 1990 to 15 May 2016, 9,118 women diagnosed with GDM were identified and randomly matched with 37,281 control women by age and timing of pregnancy (up to 3 months). Adjusted incidence rate ratios (IRRs) with 95% confidence intervals (CIs) were calculated for cardiovascular risk factors and cardiovascular disease. Women with GDM were more likely to develop type 2 diabetes (IRR = 21.96; 95% CI 18.31–26.34) and hypertension (IRR = 1.85; 95% CI 1.59–2.16) after adjusting for age, Townsend (deprivation) quintile, body mass index, and smoking. For ischemic heart disease (IHD), the IRR was 2.78 (95% CI 1.37–5.66), and for cerebrovascular disease 0.95 (95% CI 0.51–1.77; p-value = 0.87), after adjusting for the above covariates and lipid-lowering medication and hypertension at baseline. Follow-up screening for type 2 diabetes and cardiovascular risk factors was poor. Limitations include potential selective documentation of severe GDM for women in primary care, higher surveillance for outcomes in women diagnosed with GDM than control women, and a short median follow-up postpartum period, with a small number of outcomes for IHD and cerebrovascular disease. Conclusions Women diagnosed with GDM were at very high risk of developing type 2 diabetes and had a significantly increased incidence of hypertension and IHD. Identifying this group of women in general practice and targeting cardiovascular risk factors could improve long-term outcomes.

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Association of History of Gestational Diabetes With Long-term Cardiovascular Disease Risk in a Large Prospective Cohort of US Women

Deirdre Tobias, Jennifer Stuart, Shanshan Li … (2017)

Previous studies identify gestational diabetes (GD) as a risk factor for intermediate markers of cardiovascular disease (CVD) risk; however, few are prospective, evaluate hard CVD end points, or account for shared risk factors including body weight and lifestyle.