Sudden Adequate Glycemic Control in Early Gestation Can Lead To Adverse Consequences

Introduction Insulin sensitivity fluctuates throughout pregnancy: it increases during early gestation but progressively decreases in later stages as maternal peripheral tissues develop relative insulin resistance to meet fetal metabolic demands [1]. Following placental delivery, insulin sensitivity rapidly rebounds twofold, heightening the risk of severe maternal hypoglycemia [2]. This risk becomes even greater in women who experienced hypoglycemia unawareness before and during pregnancy [3]. Case Presentation A 28-year-old pregnant female patient with a history of type 1 diabetes mellitus presented to the hospital for planned admission at 36 weeks of gestation. The patient’s HbA1c levels were approximately 10–12% before pregnancy, decreasing to 7.1% by 13 weeks of gestation and further to 5.7% at 31 weeks. Glycemia was assessed based on the woman’s continuous glucose monitoring sensor, indicating normoglycemia at 71% of the time, hyperglycemia at 24%, and hypoglycemia at 5% at 31 weeks of gestation. The delivery was uneventful, resulting in the birth of a healthy infant at 37 weeks of gestation, weighing 2355 g. The patient began breastfeeding promptly after delivery. A woman was found unconscious and without vital signs within the first 24 hours after the delivery. Continuous glucose monitoring sensor device had detected hypoglycemic episodes with glycemia recorded at 2.2 mmol/L and later as low as 0.1 mmol/L. Prolonged hypoglycemia likely contributed to the altered consciousness, acute respiratory failure, and subsequent cardiac arrest, which resulted in loss of the patient’s life. Discussion According to the American Diabetes Association and NICE guidelines, achieving a HbA1c level below 6.5% before conception is recommended. Poor glycemic control and altered insulin sensitivities during pregnancy increase the risk of hypoglycemia unawareness. Additionally, sudden changes in diabetes control can significantly impact pregnancy outcomes, increasing the risk of maternal and neonatal complications [4,5]. Conclusions This case underlines the importance of pregnancy planning in women with type 1 diabetes and hypoglycemia unawareness, with a focus on the postpartum period when insulin sensitivity significantly changes.