Electrocardiographic recognition of sinus node dysfunction in children and young adults

Area of Science:

• Pediatric Cardiology
• Electrophysiology
• Cardiac Electrophysiology

Background:

• Sinus node dysfunction (SND) is a recognized condition affecting the heart's natural pacemaker.
• SND can manifest in various forms, including bradycardia, sinus arrest, and sinoatrial exit block.
• Identifying and characterizing SND in pediatric and young adult populations is crucial for timely intervention.

Purpose of the Study:

• To describe the clinical presentation and electrocardiographic findings of sinus node dysfunction in a cohort of children and young adults.
• To categorize SND types and their association with underlying cardiac conditions and surgical history.
• To highlight the incidence and diagnostic challenges of sinoatrial exit block in this age group.

Main Methods:

• Retrospective analysis of 24 pediatric and young adult patients with electrocardiographic evidence of SND.
• Classification of patients into three groups based on the type of SND: sinus bradycardia, sinus arrest, and sinoatrial exit block.
• Correlation of SND with patient age, presence of heart disease, and history of cardiac surgery.

Main Results:

• SND was observed in patients aged three days to 25 years.
• Sinoatrial exit block (Mobitz type I or II) was identified in 29% of patients.
• Eighteen patients had significant heart disease, with 11 cases of SND occurring post-cardiac surgery.
• Seven patients experienced symptomatic episodes (syncope or near-syncope), with three receiving pacemakers.

Conclusions:

• Sinoatrial exit block is a significant finding in young patients with SND, requiring meticulous electrocardiographic interpretation.
• SND, particularly following corrective cardiac surgery, is common in children and young adults with heart disease.
• SND can occur even in the absence of other cardiac abnormalities, emphasizing the need for comprehensive evaluation.