Persistent junctional reciprocating tachycardia is a rare form of refractory atrioventricular reentrant tachycardia that accounts for <1% of supraventricular tachycardia in pediatrics. The accessory pathways are generally isolated with few reported underlying structural heart defects. We present a case of a five-month-old male with refractory tachyarrhythmia found to have cor triatriatum sinister, which to our knowledge, is the first reported case of these two rare anomalies coexisting.
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