Catecholamine induced double tachycardia: case report in a child

Area of Science:

• Pediatric Cardiology
• Electrophysiology
• Autonomic Nervous System Function

Background:

• Syncope, or fainting, in children can have various underlying causes.
• Exercise and emotional stress can precipitate certain cardiac arrhythmias.
• Understanding the triggers and mechanisms of pediatric syncope is crucial for effective management.

Observation:

• A six-year-old girl presented with recurrent syncope.
• The syncope was associated with atrial flutter-fibrillation and ventricular tachycardia.
• These tachyarrhythmias were reproducibly triggered by exercise and emotion.

Findings:

• Low-dose isoproterenol infusion successfully reproduced the tachyarrhythmias.
• High-dose propranolol therapy effectively blocked the exercise- and emotion-induced tachycardias.
• This suggests a catecholamine-mediated mechanism for the observed arrhythmias.

Implications:

• Catecholamine-induced tachyarrhythmias should be considered in the differential diagnosis of unexplained syncope in children.
• Beta-blocker therapy, such as propranolol, may be a viable treatment option.
• Further research into pediatric autonomic dysfunction and cardiac arrhythmias is warranted.