NRP Oxygen Administration and Monitoring 1 — Questions and Answers

Question 1: What initial concentration of oxygen is recommended when starting positive-pressure ventilation for a term infant during neonatal resuscitation?

100% oxygen
40% oxygen
21% oxygen (room air) (Correct answer)
30% oxygen

Correct answer: 21% oxygen (room air)

NRP 8th edition recommends starting PPV with 21% oxygen (room air) for term infants, adjusting the FiO2 based on pulse oximetry targets.

Evidence from multiple randomized controlled trials has shown that initiating resuscitation with 100% oxygen in term infants is associated with increased oxidative stress, higher mortality, and adverse neurodevelopmental outcomes compared to room air. NRP 8th edition therefore recommends starting PPV with 21% oxygen (room air) for term and near-term (≥35 weeks) infants. Oxygen concentration is then titrated upward (using a blender) if the infant's SpO2 does not meet target values per the NRP SpO2 table. For preterm infants less than 35 weeks, starting with 21–30% oxygen is recommended.

Question 2: Where should the pulse oximetry probe be placed during neonatal resuscitation to measure preductal oxygen saturation?

Left hand or wrist
Right hand or wrist (Correct answer)
Either foot
The forehead

Correct answer: Right hand or wrist

Preductal SpO2 is measured on the right hand or wrist, which receives blood from the right subclavian artery — before the ductus arteriosus joins the aorta — giving a more accurate reflection of cerebral oxygenation.

In newborns with potential right-to-left shunting through the ductus arteriosus (a remnant fetal shunt), postductal blood (reaching the left hand, feet, and lower body) may have lower oxygen saturation than blood going to the brain and upper body. Preductal SpO2, measured at the right hand, reflects blood from the ascending aorta — the same blood delivered to the brain and coronary arteries. This is the most clinically relevant measurement for guiding oxygen therapy during resuscitation. Placing the probe on the left hand or feet would give postductal values, which may underestimate cerebral oxygenation or overestimate it in reverse shunting scenarios.

Question 3: What is the target preductal SpO2 at 5 minutes of life for a newborn undergoing resuscitation, according to NRP guidelines?

60–65%
70–75%
80–85% (Correct answer)
95–100%

Correct answer: 80–85%

The NRP target SpO2 at 5 minutes of life is 80–85%, reflecting the normal physiological rise from the fetal baseline as the pulmonary circulation opens and ventilation is established.

NRP provides a table of target preductal SpO2 values that reflect normal physiological transition: 1 min: 60–65%, 2 min: 65–70%, 3 min: 70–75%, 4 min: 75–80%, 5 min: 80–85%, 10 min: 85–95%. These targets guide oxygen titration during resuscitation — providers should increase FiO2 if the infant's SpO2 falls below target and decrease it (including to room air) if SpO2 exceeds target, since hyperoxia is harmful, particularly for preterm infants and those with congenital heart disease.

Question 4: Why is 100% oxygen harmful in neonatal resuscitation, and what specific risk does it pose?

100% oxygen causes bradycardia by stimulating vagal receptors in the lung
100% oxygen generates excess reactive oxygen species (free radicals), causing oxidative injury to organs including the brain and lungs (Correct answer)
100% oxygen decreases pulmonary vascular resistance too rapidly, causing cardiac failure
100% oxygen interferes with pulse oximetry accuracy

Correct answer: 100% oxygen generates excess reactive oxygen species (free radicals), causing oxidative injury to organs including the brain and lungs

Hyperoxia generates excess reactive oxygen species (free radicals), leading to oxidative stress that can injure immature tissues including the brain, lungs, and retina. This is particularly harmful in preterm infants whose antioxidant defenses are underdeveloped.

When oxygen delivery exceeds metabolic demand, the mitochondrial electron transport chain and other oxidative pathways generate reactive oxygen species (ROS) including superoxide, hydrogen peroxide, and hydroxyl radicals. These highly reactive molecules damage cell membranes, DNA, and proteins through lipid peroxidation and other mechanisms. In neonates — especially preterm infants with immature antioxidant enzyme systems (superoxide dismutase, catalase, glutathione peroxidase) — this oxidative injury contributes to bronchopulmonary dysplasia, intraventricular hemorrhage, retinopathy of prematurity, and potentially worse neurological outcomes. Evidence shows outcomes are worse when resuscitation is begun with 100% rather than 21% oxygen.

Question 5: What should the resuscitation team do if a newborn's SpO2 is consistently above the NRP target range during resuscitation?

Increase the respiratory rate to remove the excess oxygen
Wean the supplemental oxygen (FiO2) to bring SpO2 back into the target range (Correct answer)
Add PEEP to the ventilation circuit
Do nothing — SpO2 above target is always beneficial

Correct answer: Wean the supplemental oxygen (FiO2) to bring SpO2 back into the target range

If SpO2 exceeds the NRP target range, supplemental oxygen should be decreased (FiO2 weaned), since hyperoxia is harmful. The goal is to maintain SpO2 within the physiological target range, not maximize it.

Oxygen titration is bidirectional in neonatal resuscitation. If the infant's SpO2 exceeds the target range for their age in minutes (e.g., SpO2 >85% at 3 minutes when target is 70–75%), supplemental oxygen should be reduced — including back to room air (21%) if appropriate. NRP 8th edition emphasizes that oxygen is a drug with dose-dependent toxicity in neonates, and the goal is physiological oxygenation, not supranormal saturation. Providers should have a blender available to rapidly adjust FiO2 and should monitor SpO2 continuously throughout resuscitation.

Question 6: For a preterm infant less than 35 weeks gestation requiring resuscitation, what starting oxygen concentration does NRP recommend?

21% (room air)
21–30% (Correct answer)
50%
100%

Correct answer: 21–30%

For preterm infants less than 35 weeks gestation, NRP recommends starting with 21–30% oxygen and titrating based on SpO2 targets, balancing the risk of hypoxia and hyperoxia in the immature lung.

Preterm infants less than 35 weeks gestation are at higher risk for both hypoxia (due to surfactant deficiency and immature respiratory control) and hyperoxia (due to underdeveloped antioxidant defenses). NRP 8th edition recommends starting resuscitation with 21–30% oxygen for these infants, with titration guided by the standard SpO2 targets. The slight increase above room air compared to term infants accounts for the higher likelihood that preterm infants will need some supplemental oxygen. However, starting at 100% is never appropriate and has been shown to worsen outcomes in multiple studies.

NRP Oxygen Administration and Monitoring 1

What initial concentration of oxygen is recommended when starting positive-pressure ventilation for a term infant during neonatal resuscitation?