Abstract
Introduction
Women with previous gestational diabetes (pGD) are at higher risk of prediabetes (PD) after delivery. The aim of this study was to determine the prevalence of and predictors for PD among women with pGD.
Methods
The study included 186 women with pGD treated by lifestyle modification. After delivery, the women were divided into group A (n = 80) with PD and group B (n = 106) with normal glucose tolerance (NGT), defined by the results of the 2-h oral glucose tolerance test at 4–12 weeks after delivery. We recorded age, body mass index (BMI) at conception and after delivery, fasting glucose (FG), glycated hemoglobin (HbA1c), total cholesterol (TC), triglycerides (Tg), low density lipoprotein cholesterol (LDL-c), high-density lipoprotein cholesterol (HDL-c) and the Tg/HDL-c ratio measured in the third trimester of pregnancy.
Results
Of the 186 women with pGD enrolled in the study, 43% showed prediabetes at 4–12 weeks after delivery, with 13.9% of these women showing impaired FG (IFG), 12.9% showing impaired glucose tolerance (IGT) and 16.2% with IFG/IGT. The groups differed in terms of age and BMI at conception and after delivery. In the third trimester of pregnancy, HbA1c was higher in women in group A than in those in group B (mean ± standard deviation: 5.6 ± 0.4 vs. 5.2 ± 0.3%; p < 0.001), while FG was comparable. Compared to women in group B, women in group A had higher TC (7.1 ± 0.8 vs. 6.6 ± 1.0 mmol/L), Tg (2.7 ± 0.9 vs. 2.1 ± 0.6 mmol/L) and LDL-c (4.7 ± 0.8 vs. 4.3 ± 1.0 mmol/L) (all p < 0.001), lower HDL-c (1.0 ± 0.2 vs. 1.4 ± 1.0; p < 0.001) and higher median Tg/HDL-c (5.4 [range 4.6–14.3] vs. 4.9 [range 1.1–11.5]; p < 0.001). Univariate analysis found an association between prediabetes and age, BMI at conception and after delivery, HbA1c, TC, LDL-c, HDL-c, Tg and Tg/HDL-c ratio. Of these variables, the multivariate analysis showed age (odds ratio [OR] 1.19; p < 0.001), HbA1c (OR 31.06; p < 0.001), Tg (OR 4.09; p < 0.001) and LDL-c (OR 2.00; p = 0.005) as predictors for prediabetes.
Conclusion
High prevalence of early diagnosed PD in women with pGD was accompanied by advanced age and higher BMI at conception and after delivery. Moreover, age, HbA1c, Tg and LDL-c were predictors for PD.
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Why carry out this study? |
Women with previous gestational diabetes (pGD) are at higher risk of prediabetes (PD) after delivery. Despite being the subject of numerous studies, predictors for PD are not clearly defined. |
This study was conducted to determine the prevalence of and predictors for PD among women diagnosed with pGD shortly (4–12 weeks) after delivery. |
What was learned from the study? |
Our results indicated a high prevalence of PD in women with pGD tested 4–12 weeks after delivery accompanied by advanced maternal age and higher body mass index at conception and after delivery. Advanced age, glycated hemoglobin (HbA1c), triglycerides and low-density lipoprotein cholesterol measured in third trimester were predictors for PD, with HbA1c as the most prominent predictor. |
Predictive accuracy of cutoff value of 5.3% for HbA1c for detecting PD shortly after delivery among women with pGD showed a rather high sensitivity and specificity. |
Introduction
Women with previous gestational diabetes (pGD) have a several times higher risk of developing prediabetes and type 2 diabetes (T2D) in future life [1,2,3,4]. However, women with pGD seem to be underestimated regarding their future risk of developing prediabetes and T2D. Lifestyle intervention has been shown to have a beneficial effect on the 10-year risk of diabetes in women with a history of pGD and prediabetes [5], which emphasizes the necessity for early screening after delivery.
There is a need for more studies aimed at identifying women with pGD at high risk of prediabetes shortly after delivery who would benefit the most. Earlier studies revealed advanced maternal age, gestational weight gain, fasting plasma glucose (FPG) and glycated hemoglobin (HbA1c) during pregnancy, as well as HbA1c after delivery in being in the short-term time frame for screening as significant predictors for PB [1,2,3,4, 6, 7]. The numerous studies considering HbA1c and FPG as a predictors of prediabetes after delivery in women with pGD have shown conflicting results [1, 2, 6,7,8].
Previous studies indicated a specific lipid pattern among women with gestational diabetes (GD) that implies increased levels of triglycerides (Tg), low-density lipoprotein cholesterol (LDL-c) and total cholesterol (TC) and lower levels of high-density lipoprotein cholesterol (HDL-c) most often in late pregnancy [9, 10]. In contrast, a limited number of investigations hae shown that lipid parameters in early pregnancy might predict GD [11].
In this context, the aim of our study was to evaluate the prevalence of and to identify metabolic predictors for prediabetes within a short time (4–12 weeks) after delivery in women with pGD.
Methods
Research Design
This study included 186 women who were diagnosed as having GD treated only by lifestyle modification in pregnancy from 01 January 2017 until 31 December 2019 and followed in the Department for Metabolic Disorders, Intensified Treatment and Cell Therapy in Diabetes, Clinic for Endocrinology, Diabetes and Metabolic Diseases, University Clinical Center of Serbia, Belgrade. All women were followed for glycemic and lipid parameters in pregnancy as well as glucose tolerance 4–12 weeks after delivery. A 2-h oral glucose tolerance test (OGTT) was conducted 4–12 weeks after delivery, and based on the results the women were placed in one of two groups: group A, comprising those with prediabetes, and group B, comprising those with normal glucose tolerance (NGT), defined according to American Diabetes Association criteria [12]. Prediabetes was defined as impaired fasting glucose (IFG; FPG 5.6–6.9 mmol/L) and/or impaired glucose tolerance (IGT; 7.8–11.0 mmol/L) based on the results of a 2-h OGTT after delivery [12]. In all women, we recorded age and body mass index (BMI) before conception (obtained by an interview) and at 4–12 weeks after delivery. We also performed a 2-h, 75-g loaded OGTT at two time-points: between 24–28 gestational weeks (glucose measured at 0, 60 and 120 min) and 4–12 weeks after delivery (glucose measured at 0 and 120 min). Data on HbA1c and lipid parameters (TC, LDL-c, HDL-c and Tg) were collected in the third trimester of pregnancy in the fasting state.
Inclusion Criteria
Inclusion criteria were GD according to IADPSG/WHO criteria, where at least one of the glucose values from a 75-g OGTT is equal to or exceeds the following thresholds when treated only by lifestyle modification and singleton pregnancy: FPG, 5.1 mmol/L; 1-h plasma glucose (PG), 10.0 mmol/L; 2-h PG, 8.5 mmol/L [13].
Exclusion Criteria
Exclusion criteria were: need for insulin treatment for GD, previous use of metformin, pre-existing type 1 diabetes, pre-existing T2D or T2D diagnosed during 2-h OGTT 4–12 weeks after delivery, pregnancy obtained from assisted reproductive technologies, familial hyperlipoproteinemias (familial hypercholesterolemia and hypertrigliceridemia), overt hyperthyroidism or hypothyroidism, corticosteroid treatment during pregnancy and hepatic disorders.
Measurements
The relevant parameters were measured as follows:
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BMI was calculated according to equation BMI = weight (kg)/height (m2). BMI after delivery was measured before the 2-h OGTT in the fasting state.
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HbA1c was measured using a commercial test reagent (SEBIA, Lisses, France).
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FPG and PG values during the 2-h OGTT were obtained by the glucose oxidase method using a Beckman Glucose Analyzer (Beckman Instruments Inc., Fullerton, CA, USA).
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Serum lipid levels (total and HDL-c and triglycerides) were analyzed enzymatically using a commercial kit (Boehringer Mannheim GmbH Roche Diagnostics, Mannheim, Germany), while LDL-c was calculated by the standard Friedewald formula.
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Lipid index (Tg/HDL) was calculated dividing the serum concentration of TG by HDL-c after conversion to mg/dL [14].
Ethical Compliance
This investigation was performed in agreement with both the Declaration of Helsinki of 1964, as revised in 2013, and national guidelines. All participants were informed of the details of the study prior to giving informed consent for participation. All procedures were conducted in accordance with standard clinical settings. The investigation was approved by the Ethics Committee of the Faculty of Medicine, University of Belgrade (1322/VII-19).
Statistical Analysis
The descriptive statistics used to characterize the study sample included means, medians and standard deviations (SD) for numerical variables and numbers and percentages for categorical variables. The Kolmogorov–Smirnov and Shapiro–Wilk tests were used to test normal distribution. Associations between categorical data were determined using Pearson’s chi-square test. Student’s t test or the Mann–Whitney U test were used for numerical data to evaluate the differences between the investigated groups. Univariate and multivariate logistic regression analyses were used to determine factors related to prediabetes. Significant variables from univariate analysis were included in multivariate regressions, with prediabetes as outcome. The results were expressed as relative risk and corresponding 95% confidence intervals (CI). In all analyses, the level of statistical significance was set at p ≤ 0.05. The statistical analysis was performed using the SPSS version 21 (2012) software package (SPSS IBM Corp., Armonk, NY, USA).
Results
The baseline characteristics of the 186 women with pGD are given in Table 1. Based on the results of the 2-h OGTT performed 4–12 weeks after delivery, 43% showed prediabetes (group A) and 57% of women had NGT (group B). Analysis of all women with pGD in the short period after delivery revealed that 13.9% showed IFG, 12.9% showed IGT and 16.9 % had IFG/IGT.
There was a significant difference in age (mean ± SD) at conception between groups A and B (36 ± 5.6 vs. 34.1 ± 5.8 years, respectively; p = 0.023) (Table 1). At the same time, compared with women with NGT (group B), those with prediabetes shortly after delivery (group A) had higher BMI before conception (29.2 ± 6.0 vs. 27.0 ± 4.2 kg/m2; p = 0.004) and after delivery (31.9 ± 5.0 vs. 30.1 ± 3.8 kg/m2; p = 0.009) (Table 1).
Analysis of the results on glycemic parameters showed that there was no difference in FPG during the third trimester of pregnancy among women with prediabetes (5.0 ± 0.5 mmol/L) and those with NGT (5.0 ± 0.6 mmol/L; p = 0.825) shortly after delivery (Table 1). On the other hand, women with pGD and prediabetes had higher HbA1c in third trimester of pregnancy (5.6 ± 0.4%) compared to women with pGD and NGT shortly after delivery (5.2 ± 0.3%; p < 0.001) (Table 1).
Evaluation of lipid parameters in the third trimester of pregnancy showed that women placed in group A (pGD and prediabetes based on testing shortly after delivery) had higher TC, Tg and LDL-c than those in group B (NGT shortly after delivery): TC, 7.1 ± 0.8 vs. 6.6 ± 1.0 mmol/L; Tg, 2.7 ± 0.9 vs. 2.1 ± 0.6 mmol/L; and LDL-c, 4.7 ± 0.8 vs. 4.3 ± 1.0 mmol/L (all p < 0.001) (Table 1). However, HDL-c was lower among women with prediabetes and pGD (group A) than among those with NGT (group B): 1.0 ± 0.2 vs. 4 ± 1.0 mmol/L (p < 0.001) (Table 1). A between-group difference was also observed for the Tg to HDL-c (Tg/HDL-c) ratio in the third trimester of pregnancy, with higher values observed in group A than in group B (median [range]: 5.4 [4.6–14.3] vs. 4.9 [range 1.1–11.5]; p < 0.001) (Table 1).
Using univariate regression analysis, age and BMI at conception, BMI after delivery, HbA1c, lipid parameters (TC, LDL-c, HDL-c, Tg) and Tg/HDL-c ratio were found to be significantly associated with prediabetes (Table 2). In the final multivariate regression analysis, four predictors for developing prediabetes shortly (4–12 weeks) after delivery, namely age (odds ratio [OR] 1.19, 95% confidence interval [CI] 1.08–1.32; p < 0.001), HbA1c (OR 31.06, 95% CI 7.55–127.8; p < 0.001), Tg (OR 4.09, 95% CI 2.01–8.29; p < 0.001) and LDL-c (OR 2.00, 95% CI 1.23–3.25; p = 0.005), remained significant (Table 2).
The predictive accuracy of HbA1c for detecting prediabetes shortly (4–12 weeks) after delivery among women with pGD showed a sensitivity of 77.5% (95% CI 66.8–86.1) and specificity of 57.5% (95% CI 47.6–67.1) for a cut-off of 5.3% (Area under the curve 0.764, 95% CI 0.693–0.835; Fig. 1). According to our results, 77.5% of women with pGD and prediabetes shortly after delivery had HbA1c ≥ 5.3%.
Discussion
In our observational cohort study, almost half of women with pGD had prediabetes within a short time (4–12 weeks) after delivery. Those identified with prediabetes were older and had higher BMI at conception and after delivery compared to those who were not. Also, we registered higher values of HbA1c and lipid parameters in the third trimester of pregnancy among women with pGD and prediabetes in the screening time-frame. When we evaluated the risk for prediabetes, age at conception, HbA1c, Tg and LDL-c were identified as significant predictors.
In clinical settings, post-partum follow-up of pregnant women with pGD is important, as these women have a several-fold increased risk of progression to prediabetes and T2D after delivery [15, 16]. It is well known that prevalence of prediabetes and T2D among women with pGD varies from 12.7 to 56% depending on personal characteristics, diagnostic criteria and duration of follow-up [1,2,3,4].
Among our study cohort, we found prediabetes within a short period (4–12 weeks) after delivery in 43% of women with pGD, which is in line with previous results [7]. Interestingly, the incidence rate of early diagnosed diabetes after delivery has been reported to be much higher than the rate of diabetes in long-term follow-up [17]. In one study, despite pGD being known about among some of the pregnant women, only 25% of those with pGD underwent glucose screening at 4–12 weeks after delivery [18]. In that context, identifying those women at highest risk of progression from those who remain normoglycemic after GD is of key importance for targeted prevention programs.
Some prior studies in this field have shown that women with pGD who developed prediabetes after delivery were older than those with NGT after delivery [2], which is consistent with our results. In our study, advanced maternal age was associated with a 1.2-fold higher risk of prediabetes, as has previously been found in many different studies [2, 3]. This higher risk may have arisen due to advanced maternal age, suggesting that older pregnant women with pGD should be closely monitored [19].
Previous studies have also pointed out that obesity and gestational weight gain are predictors for prediabetes after delivery among women with pGD [2, 20]. We also registered higher BMI after delivery, with an average value in the range of obesity in women with pGD and prediabetes within the short period after delivery.
FPG during the third trimester of pregnancy has been evaluated with the aim to diagnose glucose intolerance in women with pGD [2]; however, there were conflicting results, with sensitivity rates ranging from 83.0 to 90.0% [21]. Our results did not show any difference for FPG in the third trimester among women with pGD with respect to glucose tolerance shortly after delivery.
Very few studies have evaluated the clinical usefulness of third-trimester HbA1c levels as a predictor of the development of prediabetes and/or T2D after delivery [2, 22, 23]. In our study, higher HbA1c values were measured in the third trimester in the group of women with pGD who developed prediabetes (group A). Furthermore, multivariate analysis of our data revealed that HbA1c values in the third trimester were the most prominent predictor for prediabetes after delivery, with women with pGD and higher values of HbA1c having a 31-fold increased risk of developing prediabetes in the screening time frame after delivery. The authors of a previous study reported that an HbA1c level ≥ 5.4%, obtained at close to 28 weeks of pregnancy, was associated with a > 5-fold increased risk of developing diabetes 5 years after pregnancy [8]. When evaluating our data, we defined an optimal cut-off value for the third trimester of pregnancy to be HbA1c < 5.3%, with higher values predicting prediabetes among women with pGD at a sensitivity of 77.5% and specificity of 57.5% Although the sensitivity of HbA1c as a screening test to predict prediabetes after delivery in women with pGD appears to be low [8], it may be suitable as a marker that defines high-risk women requiring lifestyle interventions to prevent T2D, starting already in pregnancy and continuing during the woman’s lifespan.
The results of the majority of studies conducted to date suggest that women with GD have increased TC, Tg and LDL-c levels and lower HDL-c level [9, 10]. Although it is difficult to ascertain which level of lipid elevation is pathologic, also because there are no defined criteria during pregnancy, we also found higher levels of TC, Tg and LDL-c and lower levels of HDL-c in the group of women with pGD having prediabetes shortly after delivery. From a clinical point of view, hypertriglyceridemia with low HDL-c is a rationale concern as this combination might lead to dysregulation of glucose tolerance [24]. Focusing on higher levels of Tg as a significant predictor, we showed a fourfold higher risk for prediabetes 4- to 12-weeks after delivery. This result is in line with a prospective case–control study of women with pGD where the presence of “high-risk” cluster during late pregnancy, defined as a combination of any four cardiometabolic risk factors, including lipids (BMI > 30 kg/m2, fasting glucose > 5.0 mmol/L, insulin > 7.8 mU/L, Tg > 2.4 mmol/L, HDL-c < 1.6 mmol/L or systolic blood pressure > 105 mmHg) was a better predictor for future T2D development 10 years after delivery than BMI or fasting glucose separately [25].
Some prior studies also found that the Tg/HDL-c ratio increased significantly throughout the pregnancy among women with GD [10]. In our study, we registered an increased Tg/HDL-c ratio in the third trimester in our group of women with pGD developing prediabetes. However, although univariate analysis showed that the Tg/HDL-c ratio was a significant predictor of PD, this variable was not a significant predictor in the multivariate regression analysis.
In comparison, it is well known that LDL-c is a marker of cardiovascular risk [26], which is substantially higher among women with pGD in the presence of glucose intolerance after delivery [27]. Unexpectedly, we registered higher LDL-c in the third trimester in women with pGD as a significant predictor for the future prediabetes early after delivery (twofold higher risk). However, the results regarding the role of high cholesterol as a risk factor for future glucose intolerance and T2D in women with GD are conflicting. A recent study showed that the lowest TC quartile (< 5.5 mmol/L) at the time of GD diagnosis was associated with an increased risk of abnormal glucose tolerance in women with GD after delivery, compared to lowest risk in the highest TC quartile (> 7.0 mmol/L) group [28]. In contrast, Lappas et al. found significantly higher postnatal TC concentration in women who develop T2D 10 years after GD [29]. In this study, lipidomics analysis of three lipid species, namely, the cholesteryl ester species (ceramide), the alkenylphosphatidylethanolamine species (plasmalogens) and the phosphatidylserine species, showed that the levels of these three lipid species were independently and positively associated with the development of T2D in those women with pGD. Ceramide is recognized as a proinflammatory lipid, while plasmalogens are involved in oxidative stress processes [29]. Consequently, LDL enriched in ceramide has been shown to promote inflammation and insulin resistance in skeletal muscle [30] which could partially explain our findings of high LDL-c as a good predictor for the future glucose disturbances in women with pGD. These results reinforce the need for future studies to elucidate the role of TC.
There are two major limitations to our study: (1) its observational study design and (2) a moderate number of included women with pGD related to incidence of GD in our population [31].
Conclusions
Our results imply a high prevalence of prediabetes within the short term (4–12 weeks) after delivery among women with pGD, particularly in those of advanced maternal age and with higher BMI at conception and after delivery. Moreover, risk prediction for prediabetes shortly after delivery identified advanced maternal age and available metabolic parameters, emphasizing HbA1c as the most prominent predictor, followed by Tg and LDL-c, in the third trimester. Our data should raise awareness of the importance to identify women at the highest risk of prediabetes, starting already in late pregnancy, which would enable the introduction of timely preventive strategies.
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Acknowledgements
Funding
The research reported in this article is funded by Project 175097 from the Ministry of Education, Science and Technological Development, Republic of Serbia. No commercial sponsorship was received for this study or publication of this article.
Authorship
All named authors meet the International Committee of Medical Journal Editors (ICMJE) criteria for authorship for this article, take responsibility for the integrity of the work as a whole, and have given their approval for this version to be published.
Author Contributions
Conceptualization: AZ Jotic, MM Stoiljkovic, TJ Milicic, KS Lalic, LZ Lukic, NM Lalić. Methodology: AZ Jotic, MM Stoiljkovic, TJ Milicic, LZ Lukic, MV Macesic, JN Stanarcic Gajovic, MM Milovancevic, MG Gojnic Dugalic, LZ Lukic. Formal analysis and investigation: AZ Jotic, MM Stoiljkovic, TJ Milicic, LZ Lukic, MV Macesic, JN Stanarcic Gajovic, MM Milovancevic, VM Jeremic, NM Lalić. Writing/original draft preparation: AZ Jotic, MM Stoiljkovic, TJ Milicic, KS Lalic, JN Stanarcic Gajovic, NM Lalić. Writing-review and editing: AZ Jotic, MM Stoiljkovic, TJ Milicic, KS Lalic, JN Stanarcic Gajovic, MM Stoiljkovic, NM Lalic. Funding acquisition: NM Lalic. Resources: VM Jeremic, AZ Jotic, TJ Milicic, MM Stoiljkovic, NM Lalic Supervision: AZ Jotic, KS Lalic, NM Lalic.
Disclosures
Aleksandra Z. Jotic is a member of the Diabetes Therapy editorial board. Milica M. Stoiljkovic, Tanja J. Milicic, Katarina S. Lalic, Ljiljana Z. Lukic, Marija V. Macesic, Jelena N. Stanarcic Gajovic, Mina M. Milovancevic, Miroslava G. Gojnic Dugalic, Veljko M. Jeremic and Nebojsa M. Lalic have nothing to disclose.
Compliance with Ethics Guidelines
This investigation was performed in agreement with both the Declaration of Helsinki of 1964, as revised in 2013, and national guidelines. All participants were informed of the details of the study prior to giving informed consent for participation. All procedures were conducted in accordance with standard clinical settings. The investigation was approved by the Ethics Committee of the Faculty of Medicine, University of Belgrade (1322/VII-19).
Data Availability
Access to database is currently strictly regulated by local policy and therefore the data will not be deposited.
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Jotic, A.Z., Stoiljkovic, M.M., Milicic, T.J. et al. Prevalence and Metabolic Predictors for Early Diagnosed Prediabetes in Women with Previous Gestational Diabetes: Observational Cohort Study. Diabetes Ther 12, 2691–2700 (2021). https://doi.org/10.1007/s13300-021-01144-5
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DOI: https://doi.org/10.1007/s13300-021-01144-5