In pediatric cardiopulmonary arrest, the preceding condition most often is...

• A. Respiratory failure and shock
• B. Seizure
• C. Dehydration
• D. Primary cardiac arrest

Answer: (A)

In children, cardiac arrest is most often the end result of a period of respiratory failure leading to hypoxia and poor perfusion. When ventilation or gas exchange fails, oxygen levels drop and carbon dioxide rises, causing acidosis and strain on the heart. This sequence commonly progresses to bradycardia and eventually cardiac arrest, with shock from poor perfusion compounding the problem. So the preceding condition is typically respiratory failure with shock, rather than a primary cardiac event. Seizures can cause apnea but are not the usual trigger; dehydration can cause hypovolemia but does not commonly precede pediatric arrest; primary cardiac arrest is less common in kids than in adults except in specific heart conditions.