6.2 Free-Flow Oxygen and CPAP

A Different Path From Apnea and Bradycardia

Not every newborn who needs respiratory help is apneic. A common and high-yield branch of the NRP algorithm is the infant who is breathing spontaneously, has a heart rate of at least 100, yet shows labored breathing and/or persistent central cyanosis (or saturations below the target range). These babies do not automatically receive the same treatment as an apneic infant with HR <100.

For this group, NRP prioritizes:

1. Continuous assessment of breathing effort and heart rate
2. Preductal pulse oximetry (right hand/wrist)
3. Free-flow supplemental oxygen titrated to target SpO₂
4. CPAP when labored breathing or low lung volume physiology persists
5. Escalation to PPV if the infant becomes apneic/gasping, HR falls below 100, or oxygenation remains inadequate despite appropriate noninvasive support

This path protects babies from unnecessary positive-pressure breaths while still treating hypoxemia and work of breathing aggressively enough to prevent deterioration.

When Free-Flow Oxygen Is Appropriate

Free-flow oxygen means oxygen-enriched gas is delivered to a spontaneously breathing infant without forcing gas into the lungs with bag or T-piece squeezes. Typical indications in the delivery room:

• Breathing present and HR ≥100
• Central cyanosis or SpO₂ below the minute-specific target range
• Need for careful titration while the transitional circulation is still rising toward higher saturations

Free-flow oxygen is not a substitute for PPV when the infant is apneic, only gasping, or bradycardic with HR <100. Gasping is ineffective respiration—treat it like apnea with PPV.

Practical free-flow delivery methods

Teams deliver free-flow oxygen using interfaces that provide continuous gas flow near the face:

• Oxygen tubing held close to the mouth and nose (or directed into a loosely applied mask in some setups)
• Flow-inflating bag and mask with continuous flow, held to allow inspired oxygen without forcing full PPV breaths
• T-piece resuscitator used to deliver free-flow or blended oxygen/CPAP depending on seal and settings
• Cupped hand techniques with oxygen tubing are sometimes described in older literature; modern practice prefers controlled devices and blenders when available

Always use an oxygen blender when available so you can start at an appropriate FiO₂ and titrate rather than locking into 100% by default for every mildly cyanotic term infant.

Self-Inflating Bag Limitations (High-Yield)

A self-inflating bag is excellent for PPV when gas supply fails, but it has critical limitations for the free-flow/CPAP pathway:

NRP teaching is explicit: you cannot reliably give free-flow oxygen with a mask attached to a self-inflating bag, because gas flow to the infant is not continuous when the bag is not being squeezed. Likewise, standard self-inflating bags do not provide CPAP. If the clinical plan is free-flow oxygen or CPAP for a breathing baby, choose a T-piece or flow-inflating system (or dedicated free-flow interface), and keep a self-inflating bag available as a PPV backup.

Exam trap

A question describes a cyanotic, breathing newborn with HR 140 and offers “apply the self-inflating bag and mask for free-flow oxygen” as an option. That answer is wrong. Another trap is using a self-inflating bag to “give CPAP” without understanding it does not maintain continuous positive airway pressure the way a T-piece does.

CPAP for Labored Breathing

Continuous positive airway pressure (CPAP) maintains a baseline pressure in the airway of a spontaneously breathing infant. It helps hold alveoli open, improves functional residual capacity, and reduces the work of reopening collapsing lung units with every breath. CPAP is especially helpful for:

• Preterm infants with surfactant deficiency and low lung compliance
• Term or late-preterm infants with retained lung fluid and grunting/retractions
• Infants with adequate heart rate who still have significant work of breathing after free-flow oxygen is started

How CPAP is applied in NRP contexts

CPAP is typically delivered with a tight-fitting mask connected to a T-piece resuscitator or flow-inflating bag capable of continuous flow and set or maintained positive end-expiratory pressure (often in the range used for neonatal PEEP/CPAP—commonly around 5 cm H₂O, per local device protocols). The infant must continue to breathe. If the baby becomes apneic or HR falls below 100, switch to intermittent PPV (with PEEP if the device allows).

Prolonged mask CPAP or PPV can force gas into the stomach. When support continues, place an orogastric tube to vent the stomach so diaphragmatic excursion is not impaired.

Free-flow oxygen vs CPAP vs PPV — choose by physiology

Do not use CPAP as a delay tactic when PPV criteria are already met.

Pulse Oximetry and Target SpO₂ Titration

Whenever you give supplemental oxygen or CPAP during transition, apply a pulse oximeter to the right hand or wrist (preductal). Titrate FiO₂ to the minute-specific target preductal SpO₂ ranges used in neonatal resuscitation materials. Approximate stepwise targets commonly taught:

(Some 9th-edition pocket materials emphasize practical reading from about 2 minutes onward; the clinical principle remains a gradual rise, not an immediate jump to 100%.)

Titration principles that protect the baby

• Start smart: term and late-preterm infants often begin resuscitation-related oxygen at 21% (room air) when PPV is needed; free-flow for cyanosis is titrated to targets rather than fixed at 100%. The 9th Edition initial FiO₂ bands are ≥35 weeks → 21%, 32–34 weeks → 21–30%, and <32 weeks → ≥30%. (The 8th Edition grouped everything below 35 weeks into a single 21–30% band.)
• Up-titrate if SpO₂ is below target with a good signal and the infant remains cyanotic.
• Down-titrate as soon as SpO₂ is at or above the upper end of the target band to avoid unnecessary hyperoxia.
• Avoid the “100% forever” habit. Prolonged high FiO₂ without titration is a common simulation error and can contribute to oxidative injury, especially in preterm infants.
• Trust the trend with a reliable pulse: a poor oximeter signal is not a reason to withhold indicated PPV, but neither is a single low reading during motion a reason to ignore clinical improvement.

Team Workflow for the Oxygen/CPAP Path

A clean team script might sound like:

1. “Baby is breathing, heart rate 130, retractions and cyanosis—place preductal pulse ox.”
2. “Start free-flow oxygen via T-piece at blended FiO₂; call out SpO₂ when signal is solid.”
3. “Saturations 70% at 4 minutes with continued labored breathing—apply CPAP at 5, increase FiO₂.”
4. “Saturations now 82% at 5 minutes, work of breathing improving—hold CPAP, wean FiO₂.”
5. Or: “Became apneic, heart rate 80—switching to PPV.”

Exam traps

• Giving free-flow oxygen alone to an apneic or gasping infant.
• Starting compressions for cyanosis with HR 120.
• Using a self-inflating bag as if it reliably delivers free-flow O₂ or CPAP.
• Targeting SpO₂ of 100% in the first minutes of life.
• Placing the oximeter only on a foot and titrating as if that were preductal.
• Continuing free-flow oxygen when HR falls below 100 instead of starting PPV.

If you can sort who needs free-flow/CPAP versus who needs PPV, pick a flow-capable device, and titrate to time-based SpO₂ targets, you have mastered this section of the NRP algorithm.