Permanent junctional reciprocating tachycardia due to an atypical retrograde slow conducting decremental left posterolateral accessory pathway and tachycardia‐induced cardiomyopathy in a pregnant adolescent

Abstract Permanent junctional reciprocating tachycardia (PJRT) is a rare form of supraventricular tachycardia (SVT) due to a retrograde slow conducting decremental accessory pathway (AP) which is often incessant and can lead to tachycardia‐induced cardiomyopathy (TIC). We report the challenging clinical course of a pregnant adolescent with PJRT due to an atypical retrograde slow conducting decremental left posterolateral AP. Pregnancy is known to exacerbate supraventricular arrhythmias and can lead to adverse maternal and fetal outcomes. To the best of our knowledge, there are no prior reports on the clinical course of rare incessant and difficult‐to‐treat arrhythmias such as PJRT in a pregnant adolescent patient.