During cardiopulmonary resuscitation (CPR) in a child, what is the initial target oxygen saturation?

Initial Oxygen Target During Pediatric CPR

During active CPR in a child, administer 100% inspired oxygen until return of spontaneous circulation (ROSC) is achieved and arterial oxygen saturation can be reliably measured.

Oxygen Management Algorithm

During Active CPR (Pre-ROSC)

• Use 100% FiO₂ without titration during chest compressions and ventilations
• Do not attempt to titrate oxygen based on pulse oximetry during active resuscitation
• Pulse oximetry is unreliable during CPR due to poor perfusion

Immediately After ROSC

Once ROSC is achieved, the oxygen strategy shifts dramatically:

1. Continue 100% oxygen initially until you can obtain reliable measurements 1, 2

2. As soon as arterial oxygen saturation can be measured reliably:

   • Target SpO₂ of 94-99% as a reasonable surrogate for normoxemia 2
   • Alternatively, target PaO₂ appropriate to the specific patient condition (normoxemia in most cases) 2

3. Avoid both extremes:

   • Avoid hypoxemia (known to cause harm) 2
   • Avoid hyperoxemia (associated with increased mortality in observational studies) 2

Evidence-Based Rationale

The 2020 Pediatric Life Support guidelines provide clear direction that differs between the active resuscitation phase and post-ROSC care 2. The 2024 international consensus reinforces similar principles for adults, recommending 100% oxygen until reliable measurement is possible, then targeting SpO₂ 94-98% 1.

Key distinction: The question asks about oxygen administration "during CPR" - this refers to the active resuscitation phase where 100% oxygen is standard. The nuanced titration to 94-99% only applies after ROSC when you can reliably measure oxygenation.

Important Caveats

Special Populations Requiring Modified Targets

Consider different oxygen goals for:

• Cyanotic congenital heart disease (may tolerate lower saturations)
• Single-ventricle physiology (excessive oxygen can cause pulmonary overcirculation)
• Children with chronic hypoxemia at baseline 2

Practical Challenges

• Out-of-hospital setting: Measuring arterial blood gases is difficult; pulse oximetry becomes your primary tool but carries risk of inadvertent hypoxemia if weaned too aggressively 2
• In-hospital setting: Arterial catheterization facilitates serial blood gas monitoring for more precise titration 2

Common Pitfall

Do not attempt to titrate oxygen to lower saturations during active CPR. The evidence for conservative oxygen targets (88-92%) from studies like Oxy-PICU 3 applies to critically ill children receiving mechanical ventilation, not to children undergoing active resuscitation. During CPR, maximizing oxygen delivery with 100% FiO₂ is appropriate given the severely compromised circulation.

The transition from 100% oxygen to targeted normoxemia should occur promptly after ROSC to avoid the potential harms of prolonged hyperoxemia while preventing any episodes of hypoxemia 2.