Heart rate 55 at 27 weeks: sequencing compressions, epinephrine, and access
A 27-week, 900 g infant is born after spontaneous preterm labor with ruptured membranes for 30 hours and maternal temperature 38.6 degrees C. At birth the infant is apneic and limp. You provide PPV by T-piece with mask at PIP 24, PEEP 5, FiO2 0.30. After 45 seconds with clearly visible chest rise, the ECG heart rate is 55/min and the preductal SpO2 is 60%. A colleague has placed an umbilical venous catheter during the resuscitation. The respiratory therapist asks whether to intubate before compressions begin, and the nurse asks whether the FiO2 should change.
1. What is the sequence: intubation first or compressions first, and what happens to the FiO2?
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Sequence
- Compressions start now. A heart rate below 60/min after at least 30 seconds of apparently effective PPV is the trigger, and nothing about intubation changes that trigger.
- Intubation remains strongly indicated at this gestation and heart rate, because mask ventilation in a 900 g infant is fragile and a secure airway improves the odds that compressions work. It should be performed by the person assigned to the airway in parallel with compressions, not as a gate before them.
- Before the tube goes in, ensure a third pair of hands is available; you cannot mask-ventilate, intubate, and compress with two people.
FiO2
- Increase to 100% as compressions begin. The initial 0.21-0.30 range was for the pre-compression phase; once the heart rate is below 60, the priority shifts to maximizing oxygen delivery, and 100% is the recommendation.
Reasoning: the ordering question is a coordination question, not a knowledge question. Any sequence that leaves the chest uncompressed for 30-60 seconds while a tube is passed costs the infant the one intervention with the strongest effect.
2. Compressions are underway at a 3:1 ratio with the tube in place. At the next check the heart rate is still 50/min. What do you verify before and while giving epinephrine, and what exactly do you give?
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Before the drug, verify the three things that make epinephrine work
- Ventilation: tube position, chest rise, air leak, and whether the tube has migrated; a dislodged tube mimics drug failure.
- Compressions: rate of about 90 compressions and 30 breaths per minute, depth about one-third of the anteroposterior diameter, full recoil, and interruptions kept to a few seconds.
- Access: UVC position and patency - free flow of fluid, no resistance, no extravasation.
The dose
- 0.01-0.03 mg/kg IV, i.e. 0.1-0.3 mL/kg of the 1:10,000 concentration - for 900 g that is roughly 0.09-0.27 mL.
- Give it as a bolus, then flush with about 0.5-1 mL of normal saline so the drug actually reaches the circulation.
- Repeat every 3-5 minutes if the heart rate stays below 60.
On route: the endotracheal dose (0.05-0.1 mg/kg) is a fallback only when no vascular access exists, because absorption is unreliable. With a functioning UVC, IV is preferred. Reasoning: most 'epinephrine-resistant' bradycardia in the delivery room is a ventilation or tube problem, so I would rather spend 5 seconds confirming chest rise than give a second dose blindly.
3. Two doses of epinephrine have been given and the heart rate is still 50/min. The nurse asks about 20 mL of normal saline and about sodium bicarbonate. How do you respond?
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Volume
- The dose is 10 mL/kg, not 20 mL - for 900 g that is 9 mL, given over 5-10 minutes.
- Volume is considered, not routine, and I would give it here because this history supports hypovolemia: 30 hours of ruptured membranes with maternal fever raises the possibility of fetal compromise, and the infant has had a prolonged resuscitation.
- It belongs alongside continued compressions, not instead of them.
Bicarbonate
- No. Sodium bicarbonate is not recommended during neonatal resuscitation; there is no evidence of benefit and there are real harms, including paradoxical intracellular acidosis and intraventricular hemorrhage in a 900 g infant.
What I would rather do with the next 60 seconds
- Re-check tube position and consider a pneumothorax (sudden deterioration with asymmetrical findings).
- Confirm the compressions are deep enough and being counted correctly - shallow compressions are a common and invisible failure.
- Consider whether the UVC is actually in the vein and whether the flush was given.
Reasoning: when the algorithm is not working, the answer is almost always a mechanical or anatomic problem, not a missing drug.