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[Idiopathic dilatation of the right atrium in 2 infants disclosed by arrhythmia]
Insights
Idiopathic right atrial dilatation, a rare congenital heart defect, can cause supraventricular tachyarrhythmias in infants. Early diagnosis via echocardiography is crucial for managing this condition.
Area of Science:
- Pediatric Cardiology
- Congenital Heart Malformations
- Electrophysiology
Background:
- Idiopathic right atrial dilatation is a rare congenital anomaly.
- It can present with supraventricular tachyarrhythmias in infants.
Observation:
- Two cases are presented: an 18-month-old and a 6-week-old infant.
- Both infants exhibited supraventricular tachyarrhythmias.
- Clinical examination was normal, but chest X-ray showed right heart border bulging and ECG revealed partial right bundle branch block.
Findings:
- Echocardiography diagnosed aneurysmal right atrial dilatation.
- No valvular disease or intracardiac shunt was detected.
- Cardiac catheterization confirmed the diagnosis in one case.
- One child developed tricuspid regurgitation; the other remained asymptomatic.
Implications:
- Highlights the importance of echocardiography in diagnosing idiopathic right atrial dilatation.
- Emphasizes the association between this condition and supraventricular tachyarrhythmias.
- Suggests varied clinical outcomes, from asymptomatic to developing complications like tricuspid regurgitation.
Abstract:
Idiopathic right atrial dilatation is a rare and probably congenital malformation. Two new cases are reported, in an 18 months old infant and a six week old baby, both presenting with supraventricular tachyarrhythmias. Clinical examination was normal. Chest X-ray showed bulging of the right heart border and electrocardiography revealed partial right bundle branch block. The diagnosis was made by echocardiography which showed aneurysmal dilatation of the right atrium. There were no signs of valvular heart disease or of an intracardiac shunt; the septal tricuspid leaflet was in its normal position. M-mode recordings showed no signs of Ebstein's anomaly. The diagnosis was confirmed by cardiac catheterisation in the first case; this investigation seemed to be pointless in the second case. Both children experienced many episodes of supraventricular tachyarrhythmias. The first developed tricuspid regurgitation but the second remains asymptomatic.