Which of the following is one of the Hs in reversible causes of pediatric arrest?

• A. Hypoxia
• B. Hyperglycemia
• C. Hyperkalemia
• D. Hypothermia

Answer: (A)

In pediatric arrest, the reversible causes are grouped to guide rapid treatment, with several Hs representing common problems that can be fixed to restore circulation. Hypoxia fits this group because most pediatric arrests start with respiratory failure that leads to insufficient oxygen delivery to the heart and brain. If you restore oxygenation and ventilation, you often reverse the arrest, which is why hypoxia is highlighted as one of the Hs.

Think of it this way: a child who isn’t getting enough oxygen from the lungs will quickly deteriorate; securing the airway and providing adequate oxygen or assisted ventilation addresses the root cause and can turn the tide in resuscitation. The other options don’t fit as the classic Hs in this context—hyperglycemia isn’t one of the standard Hs, hyperkalemia is an electrolyte issue not typically listed among the Hs here, and while hypothermia is indeed an H, the example that best matches the common pediatric reversible cause most often encountered is hypoxia.