A common cause of bradycardia in pediatric patients is which of the following?

• A. Hyperkalemia
• B. Hyperthermia
• C. Hypoxemia
• D. Hypoglycemia

Answer: (C)

In pediatric patients, heart rate is highly sensitive to oxygen delivery. When a child becomes hypoxemic, the body’s reflexes can increase vagal tone and depress cardiac conduction, leading to bradycardia. This makes low oxygen levels a common, reversible cause of a slow heart rate in kids, especially during respiratory distress or apnea.

The other factors aren’t as typical a trigger in children: high potassium can disrupt rhythm but isn’t the usual cause of bradycardia in this context; overheating tends to raise the heart rate rather than slow it; and low blood glucose more often causes sympathetic stimulation with tachycardia rather than bradycardia. Therefore, improving oxygenation and ventilation is the priority when bradycardia is observed in a pediatric patient.