What is the most dangerous side effect of atropine in infants?

The most dangerous side effect of atropine in infants is bradycardia. Atropine is an anticholinergic medication that increases heart rate by blocking the effects of the vagus nerve on the heart. However, in infants, the use of atropine can paradoxically lead to bradycardia or worsening of existing bradycardia. This is particularly concerning because bradycardia can lead to decreased cardiac output and insufficient blood flow to vital organs, which may result in serious complications or even cardiac arrest if not addressed promptly.

While other options like respiratory depression, hypotension, and fever can occur in different clinical contexts, they are not as directly linked to the use of atropine in this age group as bradycardia. Infants have a more sensitive response to medications affecting the cardiovascular system; thus, monitoring heart rate and rhythm is essential when administering atropine. This side effect necessitates immediate intervention, making it a critical concern for pediatric healthcare providers when treating infants.