Infant of a Diabetic Mother
A 4.3 kg male infant is born at 38 weeks to a mother with poorly controlled type 2 diabetes. At 1 hour of age he has a respiratory rate of 72 breaths/min with mild grunting and oxygen saturation 92 percent in room air. He is plethoric and jittery. There is no murmur and femoral pulses are palpable. What is the most appropriate next step in management?
- A.Intubate and start mechanical ventilation immediately
- B.Obtain an urgent echocardiogram before any other action
- C.Deliver 100 percent oxygen by non-rebreather mask
- D.Admit to the neonatal unit for observation and glucose monitoringCorrect
Explanation
The first step for any sick or distressed neonate who is maintaining adequate oxygenation with simple support is admission to a monitored setting with continuous observation, thermal support, and immediate blood glucose measurement. Infants of diabetic mothers are at high risk of hypoglycemia within the first hours of life because fetal hyperinsulinemia persists after the maternal glucose supply is cut at delivery, and jitteriness in this infant is a warning sign. They are also predisposed to respiratory problems, including transient tachypnea of the newborn after cesarean delivery, hyaline membrane disease because insulin antagonizes surfactant production, and congenital pneumonia. Other recognized complications are hypocalcemia, hypomagnesemia, polycythemia with hyperviscosity, hyperbilirubinemia, renal vein thrombosis, hypertrophic septal cardiomyopathy, and macrosomia with birth trauma such as shoulder dystocia and brachial plexus injury; sacral agenesis is the classic congenital anomaly. Escalation to mechanical ventilation is reserved for infants who remain distressed, apneic, or hypoxemic despite observation and supplemental oxygen, and this infant responds well to low-flow oxygen. Echocardiography is appropriate later if a murmur, cyanosis, or hemodynamic instability suggests septal hypertrophy or structural disease, but it is not the immediate priority. Delivering unnecessary 100 percent oxygen risks oxidative injury without addressing the metabolic assessment this infant needs.
Why each option
- A.
- Intubation is reserved for infants who remain distressed or hypoxemic despite observation and supplemental oxygen.
- B.
- Echocardiography is indicated later if a murmur or hemodynamic compromise suggests septal hypertrophy, not as the initial action.
- C.
- Unnecessary 100 percent oxygen risks oxidative injury and does not address the hypoglycemia risk.
- D.
- Correct. A distressed infant of a diabetic mother needs monitored observation with serial glucose checks as the first step.
Reference: Nelson Textbook of Pediatrics, 22nd ed., 2024, Infants of Diabetic Mothers
This is one of 3,306 questions in the MedBoardSA SMLE bank, with timed test mode, tutor mode, and progress tracking by topic.
Practise the full bank