Summary
Highlights
During pregnancy, as the baby grows, fetal demand for glucose increases. The mother's body compensates by producing more insulin, leading to an increase in pancreatic beta cells (hyperplasia). Over time, the pancreas can become exhausted and fail, leading to decreased insulin production and prolonged hyperglycemia in the mother.
Gestational Diabetes Mellitus (GDM) is a condition of impaired glucose regulation that occurs for the first time during pregnancy. It is not pre-existing diabetes. Screening typically occurs around 24 to 28 weeks of pregnancy. The video aims to explain GDM's influence on both the mother and the baby.
Insulin, a hormone produced by beta cells in the pancreas, helps regulate glucose. When food is consumed, blood sugar rises, triggering the pancreas to release insulin. Insulin then signals organs like the liver, adipose tissue, and muscle to uptake glucose, lowering blood sugar. A problem with insulin regulation means these 'switches' aren't working correctly.
The placenta produces hormones like human placental lactogen, cortisol, progesterone, and estrogen. These hormones can increase insulin resistance, meaning insulin is less effective at facilitating glucose uptake by target organs. This leads to increased blood glucose, further straining the pancreas to produce more insulin, eventually leading to pancreatic failure and hyperglycemia.
Risk factors for GDM include maternal age (over 25, especially over 35), increased BMI, multiple gestations (more than one baby), and Polycystic Ovarian Syndrome (PCOS). These factors can contribute to insulin resistance or difficulty regulating insulin during pregnancy.
With decreased insulin and increased blood glucose (hyperglycemia), the mother experiences the 'three P's': polydipsia (excessive thirst), polyuria (frequent urination), and polyphagia (increased hunger). For the baby, increased fetal blood glucose leads to the baby's pancreas producing more insulin, resulting in macrosomia (large baby) and polyuria, which causes hydramnios (increased amniotic fluid).
Complications include a chance of spontaneous abortion (though less common), increased risk of C-section or difficult birth due to macrosomia and hydramnios, overdistention of the uterus which can lead to pre-rupture of membranes and preterm labor. Mothers also have a 50% increased risk of developing type 2 diabetes within five years after birth. Babies can experience hypoglycemia after birth due to continued high insulin production without the mother's glucose supply.
Diagnosis involves random capillary glucose tests, urine analysis for ketones or sugar, and if these are consistently high, an Oral Glucose Tolerance Test (OGTT). The first step is a 1-hour glucose tolerance test (non-fasting, 50g glucose solution); if blood sugar is >130-140 mg/dL, a 3-hour glucose test is performed. The 3-hour test (overnight fasting, 100g glucose) involves initial fasting glucose, and then checks at 1, 2, and 3 hours. Two or more abnormal values (fasting >95, 1hr >180, 2hr >155, 3hr >140) diagnose GDM.
Treatment focuses on glucose management, starting with diet and exercise. Education on regulating diet (not eliminating carbs) and light exercise (like walking after meals) is crucial. Patients monitor blood glucose at home, typically upon waking and before meals. If diet and exercise are insufficient, medications like oral metformin or insulin may be prescribed. Patients are also counseled on the possibility of C-section or difficult labor and should be taught how to perform kick counts to monitor fetal well-being.