What is the role of arterial blood gas in pediatric cardiac arrest management?

• A. It is used to guide immediate defibrillation energy
• B. It helps determine if respiratory acidosis is present
• C. It replaces continuous pulse checks
• D. It is not useful

Answer: (B)

During pediatric cardiac arrest, arterial blood gas is most helpful for evaluating ventilation and acid-base status. The key point is the PaCO2 value: a high PaCO2 indicates respiratory acidosis from inadequate ventilation or airway issues during CPR. This information guides adjustments to airway management and ventilation settings to improve CO2 clearance and pH balance. ABG also provides pH and bicarbonate, giving a picture of overall acid-base disturbance from poor perfusion, which informs post-arrest care, but its results do not dictate when to deliver a shock or how much energy to use. Defibrillation decisions depend on rhythm and guideline recommendations, not ABG data, and continuous pulse checks remain essential for assessing circulation. So, the arterial blood gas helps determine if respiratory acidosis is present, guiding ventilation optimization during arrest management.