Term infant, no chest rise: fixing ventilation before escalating
A 39-week infant is born by scheduled cesarean delivery to a mother with no labor, no risk factors, and clear amniotic fluid. At 30 seconds the infant is limp and apneic; the ECG shows a heart rate of 70/min and the preductal oximeter reads 60%. You start PPV with a T-piece resuscitator at PIP 22, PEEP 5, rate 50, FiO2 0.21. After 15 seconds there is no audible chest rise, the abdomen is not moving, and the heart rate is still 70. You notice the mask is over the mouth but the chin has dropped toward the chest. The respiratory therapist reaches for a laryngoscope and asks whether to intubate now.
1. What is your next action, and why is intubation not the immediate step?
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Action: run the corrective sequence for ineffective mask ventilation, starting with the simplest fix.
- Reposition the head to a sniffing position and lift the chin out of the chest - the chin-to-chest posture seen here obstructs the airway and is likely the primary problem.
- Mask adjustment to a two-person technique if the seal is uncertain.
- Suction the mouth then nose if secretions are audible or visible.
- Open the mouth and re-seat the mask.
- Pressure increase only after the above, if chest rise is still absent.
- Alternative airway - that is when the laryngoscope comes out.
Reasoning: an unopened airway will not be fixed by a tube; intubation of an obstructed pharynx fails in the same way the mask did, and it consumes 20-30 seconds of a heart rate that is already 70. The decision rule is that intubation is the last step of the corrective sequence, not the first response to a flat chest. If the heart rate were falling or the airway clearly obstructed despite correction, I would move faster.
2. After repositioning, chest rise is now visible. At 1 minute the ECG heart rate is 90/min and the preductal SpO2 is 55%. The RT asks to go to FiO2 100%. How do you respond?
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Response: do not jump to 100%. The problem in front of me is ventilation, not oxygen concentration.
- Interpret the numbers first: at 1 minute the goal SpO2 is roughly 60-65%, so 55% is mildly low but not alarming in a term infant 60 seconds old. A heart rate of 90/min means the ventilation is still not effective enough - that is the finding to fix.
- Keep FiO2 at 0.21 for now and titrate upward in increments only if SpO2 stays below target despite good chest rise; in a term infant I have room to go slowly.
- Re-examine the mechanics: mask leak, chin position drifting back, PIP adequate for a term lung, rate 40-60, and whether a second person is needed to hold the mask.
Reasoning: in a term infant, oxygen is not the limiting variable - minute ventilation is. Escalating FiO2 while the heart rate sits at 90 treats the monitor rather than the patient, and unnecessary oxygen exposure carries its own risk. I reserve 100% for the moment compressions begin.
3. By 2 minutes the heart rate is 140/min, SpO2 is 80%, and the infant is breathing spontaneously but with grunting and mild retractions. The RT asks whether to keep the T-piece on the mask. What do you do, and what are you watching for?
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Action: stop positive pressure ventilation and support with CPAP/free flow, then reassess.
- Heart rate above 100/min with sustained spontaneous breathing means PPV has achieved its goal; continuing to deliver breaths against active breathing adds risk without benefit.
- Transition to CPAP or free-flow oxygen with PEEP through an appropriate interface, keep the preductal oximeter and ECG on, and stay at the bedside.
- Accept an SpO2 around 80% at 2 minutes, trending toward 85-95% by 10 minutes; titrate FiO2 to that curve rather than to a single number.
What I am watching for
- Grunting plus retractions that worsen, or a rising work of breathing: suggests the infant is not yet sustaining adequate ventilation and may need escalation to CPAP or intubation.
- A falling heart rate or desaturation after improvement: think pneumothorax, secretions, or fatigue before assuming the CPAP is simply set too low.
- Recurrent apnea: return to PPV and reassess the airway.
Reasoning: the endpoint of PPV is a stable infant doing his own breathing, not a completed checklist. De-escalating promptly is as much a judgement call as starting.