Cardiac arrest in the pediatric population is MOST commonly the result of:

• A. Primary cardiac disease
• B. Drowning
• C. Anaphylaxis
• D. Respiratory or circulatory failure

Answer: (D)

In children, cardiac arrest most often follows a problem with breathing or circulation that leads to inadequate oxygen delivery, rather than a primary heart problem. When a child stops ventilating properly—for example due to airway obstruction, respiratory illness, or drowning—the lack of oxygen quickly affects the heart and brain. As oxygen delivery declines, the heart can no longer maintain effective circulation, culminating in arrest. This sequence explains why respiratory or circulatory failure is the best answer. Specific triggers like drowning or severe allergic reactions can precipitate arrest, but they are particular scenarios that still involve failure of oxygen delivery; primary cardiac disease is much less common in kids. In practice, this means prioritizing airway management, ventilation, and rapid CPR to restore oxygenation and perfusion.