Why Do Babies on Prostaglandin E1 Need Intubation?

When a baby is born with dextro-transposition of the great arteries (D-TGA), they are given a life-saving medication called Prostaglandin E1 (PGE1). Delivered as a continuous infusion through an IV or an umbilical line, this medication keeps a fetal blood vessel called the ductus arteriosus open. This allows oxygen-poor and oxygen-rich blood to mix until heart surgery can be performed, which typically happens within the first week of life ^[1][2].

Seeing your newborn in the intensive care unit with a breathing tube (intubated) can be terrifying. It is natural to worry that this means their heart is failing. However, the breathing tube is frequently placed to safely manage a common side effect of PGE1 called apnea (pauses in breathing), rather than because of heart failure ^[2]. The tube is placed for airway safety, ensuring your baby breathes steadily while they wait for their operation. While the tube is in place, your baby will be given sedation medications to keep them comfortable, sleepy, and free from pain.

How PGE1 Affects Breathing

Breathing is automatically controlled by a part of the brain called the brainstem. As PGE1 travels through the bloodstream, it can interact with this control center. Research suggests that PGE1 alters chemical signals in the brainstem, which can temporarily suppress the central drive to breathe ^[3]. This causes the baby’s brain to briefly “forget” to trigger a breath, leading to an apneic event (apnea) ^[4][2]. On the monitors, an apneic event may look like a sudden drop in heart rate or oxygen levels, often triggering alarms before the care team intervenes.

Who is Most at Risk?

Respiratory depression (slower or paused breathing) is a recognized side effect, but it does not affect every infant.

• In general, about 12% of babies receiving PGE1 experience respiratory depression ^[5].
• The risk is significantly higher in premature babies or infants with a low birth weight (under 2.0 kg), reaching up to 42% ^[5][4].

To lower this risk, medical teams often use the lowest effective dose of the medication, which can help maintain the open blood vessel while minimizing the chance of apnea ^[6][2]. In some cases, respiratory stimulants like caffeine may also be considered to counter the medication’s effect on the brainstem ^[3].

Why Proactive Intubation is Used

Because apneic pauses can happen suddenly and without warning, doctors often take a “safety first” approach. This involves placing a breathing tube down the airway and connecting it to a ventilator—a process known as prophylactic intubation ^[7].

There are several reasons doctors choose to intubate a baby on PGE1:

• Airway Security: If a baby stops breathing, the ventilator automatically steps in to provide oxygen ^[2].
• Safe Transport: Babies with D-TGA often need to be moved to specialized pediatric cardiac centers. Placing a breathing tube guarantees that the airway is secure during the bumpy and unpredictable environment of an ambulance or helicopter transport ^[7].
• Pre-Surgical Stability: The tube ensures the baby stays in the best possible condition, with optimal oxygen levels, as they head into heart surgery.

While the medication-induced apnea resolves once PGE1 is stopped, it is important to know that your baby will not have their breathing tube removed immediately after surgery. They will remain intubated for a period of time to safely recover from the stress of open-heart surgery. The care team will remove the tube only when your baby is stable and breathing strongly on their own.