Effects of Diabetes and Endocrine Disorders on Pregnancy and the Fetus

Diabetes and endocrine disorders are common conditions that may affect women before, during, or after pregnancy. When these disorders occur before or during pregnancy, they can lead to several health complications that may significantly affect fetal well-being. However, most of these complications can be completely prevented through early diagnosis and proper management.

First: Effects of Diabetes on Pregnancy and the Fetus

Diabetes may exist before pregnancy or may develop during pregnancy. Diabetes can affect individuals at any age, and some forms commonly appear in childhood.
If a woman has diabetes before pregnancy, she requires strict glycemic control through diet and regular use of prescribed medications, ensuring that HbA1c does not exceed 6.5% in the months preceding pregnancy.
Gestational diabetes (diabetes occurring during pregnancy) usually develops in the later stages of pregnancy due to increased levels of pregnancy hormones. These hormones reduce the effectiveness of insulin, leading to elevated blood glucose levels in some women.
Whether diabetes exists before pregnancy or develops during it, good blood glucose control is essential to prevent complications in both the mother and the fetus.

Diagnostic criteria for diabetes during pregnancy differ from standard criteria:
-Fasting blood glucose should not exceed 92 mg/dL
-Two-hour post 75g glucose load should not exceed 153 mg/dL

Effects of High Blood Sugar on the Fetus

1. Congenital malformations:
   High blood glucose, especially in early pregnancy or in the three months before conception, increases the risk of congenital anomalies affecting the heart, spinal cord, digestive system, and may also increase the risk of cleft lip.
   These risks are lower in gestational diabetes, which typically occurs in late pregnancy.

Good glycemic control before and throughout pregnancy significantly reduces these risks. Folic acid supplementation (5 mg daily) before pregnancy and during the first trimester also reduces the risk of neural tube defects.

2. Increased risk of miscarriage, especially in early pregnancy with poor glycemic control.
3. Increased fetal size (macrosomia), which may complicate vaginal delivery.
4. Preterm birth. As fetal risk increases with advancing pregnancy, early delivery may be necessary. Continuous monitoring of fetal movements is essential.
5. Neonatal hypoglycemia after birth due to increased fetal insulin production in response to maternal hyperglycemia.
6. Respiratory distress in newborns, especially in preterm deliveries.
7. Neonatal jaundice (hyperbilirubinemia).
8. Low calcium levels in the newborn.

Effects of Maternal Diabetes on the Mother

1. Increased risk of hypertension and preeclampsia (pregnancy toxemia).
2. Worsening of diabetic retinopathy and kidney complications.
3. Elevated liver enzymes and low platelet count in some cases.
4. Increased likelihood of cesarean delivery.

Prevention of Diabetes-Related Complications in Pregnancy

For women with pre-existing diabetes:

Achieve optimal blood glucose control before conception and throughout pregnancy.

• Take folic acid before pregnancy and during the first trimester.

For gestational diabetes:

• Prevent obesity, which is a major risk factor.
• Monitor blood glucose regularly.
• Follow the treatment plan prescribed by a specialist.

Second: Effects of Endocrine Disorders on Pregnancy and the Fetus
It is important to note that normal physiological changes during pregnancy can affect hormone levels, so appropriate laboratory tests must be selected carefully for accurate diagnosis.
Several endocrine disorders can affect pregnancy, including:

1. Hyperthyroidism (Overactive Thyroid)
Hyperthyroidism negatively affects fetal growth and increases the risk of miscarriage and preterm birth.
Maternal antibodies stimulating the thyroid may cross the placenta and cause fetal hyperthyroidism.
Treatment during pregnancy is challenging because antithyroid medications can cross the placenta; therefore, the lowest effective dose should be used.
If radioactive iodine is used for treatment, pregnancy must be delayed for at least 6 months.

2. Hypothyroidism (Underactive Thyroid)
Hypothyroidism is an important cause of infertility.
During pregnancy, it may lead to miscarriage and impaired fetal development.
In newborns, untreated hypothyroidism can cause intellectual disability; therefore, early diagnosis and treatment are critical.
Newborn screening programs using heel-prick blood samples allow early detection and effective treatment, preventing complications.

3. Hyperprolactinemia (Increased Prolactin Hormone)
Elevated prolactin levels often lead to infertility.
Treatment is usually simple, but in some cases, the cause may be a benign pituitary tumor, which can enlarge during pregnancy and cause headaches or visual disturbances.

4. Diabetes Insipidus
This condition results from deficiency of posterior pituitary hormones, leading to excessive urination.
It may worsen during pregnancy and can reduce amniotic fluid volume, potentially threatening pregnancy continuation.

5. Cushing’s Syndrome
Cushing’s syndrome causes excessive cortisol secretion, which increases the risk of miscarriage and preterm birth.

Conclusion
Most diabetes and endocrine disorders can be effectively managed and their complications avoided through early diagnosis, careful monitoring, and strict adherence to medical advice. Proper management ensures a safe pregnancy for both mother and fetus.