NRP Oxygen Administration and Monitoring 2 — Questions and Answers

Question 1: What device is used to precisely control the fraction of inspired oxygen (FiO2) delivered during neonatal resuscitation?

Flow inflating bag
Oxygen blender (Correct answer)
T-piece resuscitator
Nasal cannula flow meter

Correct answer: Oxygen blender

An oxygen blender allows precise mixing of oxygen and air to deliver any FiO2 from 21–100%, enabling titration based on pulse oximetry during resuscitation.

An oxygen blender connects to both oxygen (100%) and air (21%) sources and allows continuous adjustment of the inspired oxygen concentration from 21% to 100% in precise increments. This is essential equipment in the delivery room resuscitation area, as NRP guidelines require the ability to titrate FiO2 based on the infant's SpO2. Without a blender, providers cannot deliver intermediate concentrations and must choose between room air and 100% oxygen. The blender output is connected to a flow meter and then to the resuscitation device (T-piece, flow-inflating bag, or self-inflating bag with reservoir).

Question 2: Can a self-inflating bag reliably deliver free-flow oxygen to a newborn when held close to (not sealed over) the face?

Yes, free-flow oxygen through a self-inflating bag is reliable and recommended
No, a self-inflating bag cannot reliably deliver free-flow oxygen — use a mask held near the face connected to a flow-inflating bag or T-piece instead (Correct answer)
Yes, but only if the bag is compressed partially
No, oxygen should never be blown near a newborn's face

Correct answer: No, a self-inflating bag cannot reliably deliver free-flow oxygen — use a mask held near the face connected to a flow-inflating bag or T-piece instead

A self-inflating bag cannot reliably deliver free-flow oxygen when held near the face without a seal, as the bag's valve design routes gas from the bag itself (room air) rather than from the oxygen inlet. Free-flow oxygen should be delivered via a flow-inflating bag or a mask connected to an oxygen source.

The self-inflating bag has a one-way patient valve that directs gas from the bag during squeezing but does not provide a reliable oxygen flow when the mask is held near (but not sealed over) the face. The oxygen inlet on a self-inflating bag allows O2 enrichment of the bag's internal volume, but during free-flow (unsealed), gas is drawn from around the mask rather than through the bag. For free-flow oxygen supplementation (e.g., for an infant breathing spontaneously but with SpO2 below target), a flow-inflating bag, T-piece resuscitator, or an oxygen mask directly connected to a flow meter should be used. This is an important practical distinction in NRP training.

Question 3: What is the recommended minimum oxygen flow rate when using a flow-inflating bag or T-piece resuscitator during neonatal resuscitation?

1–2 L/min
5–10 L/min (Correct answer)
15–20 L/min
0.5 L/min

Correct answer: 5–10 L/min

A flow rate of 5–10 L/min is recommended for flow-inflating bags and T-piece resuscitators to ensure adequate gas flow for ventilation and free-flow oxygen delivery.

Flow-inflating bags and T-piece resuscitators are flow-dependent devices — they require continuous gas flow from the oxygen/air source to function. A flow rate of 5–10 L/min is recommended to: (1) maintain adequate pressure for ventilation breaths; (2) ensure reliable FiO2 delivery from the blender; (3) provide free-flow oxygen when needed. Insufficient flow will cause the flow-inflating bag to collapse and the T-piece to not deliver proper peak inspiratory pressures. Excessive flow is wasteful and may lead to unnecessarily high pressures. T-piece resuscitators use a set PEEP cap and PIP adjustment to regulate pressures independent of flow within this range.

Question 4: Which of the following represents appropriate oxygen management for a term newborn who is breathing spontaneously but has an SpO2 of 72% at 3 minutes of life?

Immediately start PPV with 100% oxygen
Observe without intervention — this SpO2 is within normal range at 3 minutes (Correct answer)
Apply free-flow supplemental oxygen and reassess SpO2
Intubate the infant and ventilate with 50% oxygen

Correct answer: Observe without intervention — this SpO2 is within normal range at 3 minutes

The NRP target SpO2 at 3 minutes is 70–75%. An SpO2 of 72% at 3 minutes is within target. No intervention beyond observation is needed for a spontaneously breathing infant whose SpO2 is meeting targets.

According to NRP's SpO2 target table, the acceptable preductal SpO2 at 3 minutes of life is 70–75%. An SpO2 of 72% in a term infant who is breathing spontaneously and has good tone is within the expected physiological range. Intervening with supplemental oxygen or PPV at this point is not indicated and could expose the infant to unnecessary oxygen toxicity. The provider should continue to monitor SpO2 closely and be ready to intervene if saturations fall below the lower target or if breathing becomes inadequate, but no immediate action is required in this scenario.

Question 5: What happens to pulse oximetry accuracy if the probe is placed on the newborn before connecting it to the oximeter?

The oximeter will immediately read the correct SpO2
The probe should be connected to the oximeter first, then applied to the infant, for faster signal acquisition (Correct answer)
Probe placement order does not affect measurement accuracy
The probe must warm the skin before being connected to the oximeter

Correct answer: The probe should be connected to the oximeter first, then applied to the infant, for faster signal acquisition

NRP recommends connecting the probe to the oximeter before applying it to the infant, which significantly speeds up signal acquisition and reduces the time to first reliable SpO2 reading.

Pulse oximeters can take considerable time to acquire a signal and display an accurate reading after the probe is placed on the patient. Research and NRP training show that connecting the pulse oximetry probe to the oximeter before placing it on the infant significantly reduces the time to signal acquisition. This is because the oximeter can begin processing and calibrating its algorithm before the sensor is attached, allowing faster detection of the pulsatile signal. In a time-critical resuscitation, every second of delay in reliable SpO2 monitoring can impact decision-making, particularly for decisions about oxygen titration.

Question 6: In which clinical scenario would it be appropriate to use 100% oxygen during neonatal resuscitation despite NRP's standard recommendation to start at lower FiO2?

A term infant with SpO2 of 60% at 1 minute
An infant receiving CPR for heart rate below 60 bpm despite PPV (Correct answer)
A preterm infant at 28 weeks needing intubation
Any infant whose Apgar score is below 5 at 1 minute

Correct answer: An infant receiving CPR for heart rate below 60 bpm despite PPV

NRP recommends considering 100% oxygen during active CPR for heart rate below 60 bpm, as the priority in cardiac arrest is maximizing oxygen delivery. Wean as quickly as possible once circulation is restored.

While NRP recommends starting resuscitation with lower FiO2 (21% for term, 21–30% for preterm), the guidelines recognize that when cardiac compressions are required (HR persistently below 60 bpm despite PPV), the clinical priority shifts to maximizing oxygen delivery to a severely compromised heart and brain. In this setting, 100% oxygen is recommended for the duration of CPR. However, as soon as circulation is restored and the heart rate recovers above 60 bpm, supplemental oxygen should be titrated down promptly using pulse oximetry targets, to avoid post-resuscitation hyperoxia, which can worsen ischemia-reperfusion injury.

NRP Oxygen Administration and Monitoring 2

What device is used to precisely control the fraction of inspired oxygen (FiO2) delivered during neonatal resuscitation?