A 32-year-old multiparous woman with GDM diagnosed at 26 weeks is counselled on maternal and fetal complications. Regarding the complications and long-term sequelae of GDM, all of the following are associated with GDM EXCEPT:

Question

Accepted Answer

D. Intrauterine growth restriction as the primary fetal complication in poorly controlled GDM. ## Maternal and Fetal Complications of GDM

### Correct Answer: Intrauterine Growth Restriction (IUGR)

**Key Point:** IUGR is NOT a typical complication of GDM. In fact, GDM is associated with **fetal macrosomia** (excessive fetal growth), not growth restriction. IUGR is seen in pre-eclampsia, placental insufficiency, and maternal vascular disease — not hyperglycaemia.

### Why Other Options Are True Complications

| Complication | Mechanism | Clinical Significance |
|--------------|-----------|----------------------|
| **Neonatal hypocalcaemia & hypomagnesaemia** | Maternal hyperglycaemia → fetal hyperinsulinaemia → suppression of parathyroid hormone (PTH) and magnesium reabsorption | Presents as jitteriness, seizures, tetany in first 24–72 hours of life |
| **Maternal type 2 DM** | GDM indicates underlying insulin resistance; 50–60% develop type 2 DM within 5–10 years | Requires postpartum glucose tolerance testing and lifestyle counselling |
| **Neonatal RDS** | Fetal hyperinsulinaemia inhibits surfactant synthesis and delays lung maturity; also associated with preterm delivery | Risk increases with poor glycaemic control; antenatal corticosteroids recommended if preterm delivery anticipated |

### Fetal Complications of GDM

**High-Yield Mnemonic — "FETAL MACROSOMIA" complications:**
- **F**etal macrosomia (birth weight >4000–4500 g)
- **E**xcessive amniotic fluid (polyhydramnios)
- **T**ransposition of great arteries (cardiac anomalies, increased 2–3×)
- **A**cute complications: shoulder dystocia, brachial plexus injury, birth trauma
- **L**ate complications: neonatal hypoglycaemia, hypocalcaemia, hypomagnesaemia, RDS
- **M**aternal: pre-eclampsia, polyhydramnios, preterm labour
- **A**nemia (polycythaemia in neonate)
- **C**ardiomyopathy (transient hypertrophic cardiomyopathy)
- **R**espiratory distress (delayed lung maturity)
- **O**besity and metabolic syndrome in childhood
- **S**udden intrauterine fetal death (rare, with very poor control)
- **O**besity and type 2 DM in offspring (long-term)
- **M**acrosomia-related injuries (shoulder dystocia, clavicular fracture)
- **I**ntrauterine infections (no direct link)
- **A**nomalies (cardiac, renal, skeletal — 2–3× increased risk)

**Clinical Pearl:** The hallmark of GDM is fetal **macrosomia with hyperinsulinaemia**, not growth restriction. Poorly controlled GDM leads to large-for-gestational-age (LGA) infants at risk of birth trauma and metabolic derangements.

**Warning:** Do not confuse GDM (hyperglycaemia → macrosomia) with pre-eclampsia or placental insufficiency (which cause IUGR). This is a classic exam trap.

Answer

A. Neonatal hypocalcaemia and hypomagnesaemia due to maternal hyperglycaemia-induced fetal hyperinsulinaemia

Answer

B. Increased risk of maternal type 2 diabetes mellitus within 5–10 years postpartum

Answer

C. Neonatal respiratory distress syndrome due to delayed fetal lung maturity

A 32-year-old multiparous woman with GDM diagnosed at 26 weeks is counselled on maternal and fetal complications. Regarding the complications and long-term sequelae of GDM, all of the following are associated with GDM EXCEPT:

Explanation

Maternal and Fetal Complications of GDM

Correct Answer: Intrauterine Growth Restriction (IUGR)

Why Other Options Are True Complications

Fetal Complications of GDM

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Complication	Mechanism	Clinical Significance
Neonatal hypocalcaemia & hypomagnesaemia	Maternal hyperglycaemia → fetal hyperinsulinaemia → suppression of parathyroid hormone (PTH) and magnesium reabsorption	Presents as jitteriness, seizures, tetany in first 24–72 hours of life
Maternal type 2 DM	GDM indicates underlying insulin resistance; 50–60% develop type 2 DM within 5–10 years	Requires postpartum glucose tolerance testing and lifestyle counselling
Neonatal RDS	Fetal hyperinsulinaemia inhibits surfactant synthesis and delays lung maturity; also associated with preterm delivery	Risk increases with poor glycaemic control; antenatal corticosteroids recommended if preterm delivery anticipated