Abstract
BACKGROUND: Hyperglycemia in pregnancy (HIP) comprises gestational diabetes mellitus (GDM) and pre-existing diabetes; type 1 diabetes (T1DM), type 2 diabetes (T2DM), and undetermined diabetes. Hyperglycemia in pregnancy leads to fetal and maternal complications. OBJECTIVES: To observe and compare glycemic profiles (GP) and hypoglycemia awareness (HA) in women with GDM and pre-existing diabetes. METHODS: This prospective observational comparative study enrolled women with HIP registered at Sulaimani Maternity Teaching Hospital from January to April 2024. Self-monitoring blood glucose (SMBG) was used to document GP through mean blood glucose (MBG) analysis and the proportions of hyperglycemic, euglycemic, and hypoglycemic records. The Gold score was used to assess HA. Statistical analysis was conducted using SPSS version 27.0, employing chi-square, Mann-Whitney, Fisher's exact test, Kruskal-Wallis test, ANOVA, and independent t-tests. A P-value of ≤ 0.05 was considered significant. RESULTS: One hundred patients were included in the final analysis. Half of the women were over 35 years old, 53% had GDM, and 47% had pre-existing diabetes. The MBG levels at fasting, 1-hour post-breakfast, and post-dinner were significantly highest in T1DM and lowest in GDM, while the levels were similar after lunch. Compared with pre-existing diabetes, women with GDM had a significantly greater proportion of euglycemic records and a lesser proportion of hyperglycemic and hypoglycemic records. Daily insulin requirements were significantly higher in women with pre-existing diabetes than in those with GDM (0.52 ± 0.35 vs 0.24 ± 0.12 units/kg, respectively, P < 0.001). Hypoglycemia episodes (HE) were 5.7 vs 1.83 events/patient/month in pre-existing diabetes vs GDM, respectively (P = 0.002). Using the Gold score to determine HA, 40% of T1DM patients had reduced HA, 40% had borderline HA, while 20% of T1DM and patients with other types of diabetes had normal HA (P < 0.001). CONCLUSIONS: Women with GDM had a significantly more stable GP, fewer HE, and lower insulin requirements than those with pre-existing diabetes. Type 1 diabetes patients had the most unstable GP, with significantly higher proportions of hyperglycemic and hypoglycemic records and reduced HA.