Association Between Lipid Trajectories During Pregnancy and Risk of Postpartum Glucose Intolerance After Gestational Diabetes Mellitus: A Cohort Study
Abstract Background: To assess lipid trajectories throughout pregnancy in relation to early postpartum glucose intolerance in women with gestational diabetes mellitus(GDM).Methods: This prospective cohort study included 221 Chinese women with GDM who completed plasma lipid test in each trimester of pregnancy and oral glucose tolerance test at 6-9 weeks post-delivery between January 1st 2018 and January 8th 2020. Using the group-based trajectory modeling (GBTM), total cholesterol(TC), triglyceride(TG), low density lipoprotein-cholesterol(LDL-C), and high density lipoprotein-cholesterol(HDL-C) were identified separately as three trajectories: low, moderate, and high trajectory. The associations between lipid trajectories and early postpartum glucose intolerance were all evaluated.Results: Seventy-three participants developed postpartum glucose intolerance. For patients in low, moderate and high trajectory, the incidence of postpartum glucose intolerance was 38.4, 34.9, and 17.9%, respectively. GDM women with lower LDL-C trajectories presented a higher risk of postpartum glucose intolerance. The adjusted odds ratio(95% CI) for glucose intolerance was 3.14(1.17-8.39) in low LDL-C trajectory and 2.68(1.05-6.85) in moderate trajectory when compared with the high one. However, TC trajectory was not associated with risk of postpartum glucose intolerance, nor were TG trajectory and HDL-C trajectory. Moreover, a significant difference of insulin sensitivity was observed in participants with different LDL-C trajectories, participants in high LDL-C trajectory had the highest insulin sensitivity whereas the women in low LDL-C trajectory had the lowest insulin sensitivity(P=0.02). Conclusions: The high trajectory of LDL-C during pregnancy may play a protective role on postpartum glucose intolerance in women with GDM. Further studies are warranted to explore the underlying mechanism.Trial registration: The study was reviewed and approved by the Institutional Review Board of The First Affiliated Hospital of Sun Yat-sen University(reference number: [2014]No. 93). All participants provided written informed consent forms, and the ethics committee approved this consent procedure.