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A 25-year-old man presented to the emergency department with acute onset palpitation. He had a history of four to five similar episodes in the past 2 months, which had resolved on their own. ECG showed supraventricular tachycardia (SVT) with a rate of 170/min (figure 1). He was treated with intravenous adenosine which reverted the tachycardia. Transthoracic echocardiogram was attempted but an adequate window could not be obtained as the patient was obese. Only the spatial relationship of the two great vessels in the form of malposition could be made out which confirmed the aorta was left and anterior and the pulmonary artery was right and posterior (figure 2). The visceral situs was normal. Hence a transoesophageal echocardiogram was performed which suggested a diagnosis of corrected transposition of great vessels (c-TGV) with dynamic left ventricular outflow tract obstruction with a peak gradient of 20 mm Hg (figure 3, video 1). Dysfunction of the systemic ventricle (morphological right ventricle, MRV) was also noted. Cardiac MRI confirmed the diagnosis as c-TGV with small perimembranous ventricular septal defect and non-compaction of the MRV with a ratio of the non-compacted to compacted segment greater than 2.3 as per the present criteria1 (figure 4A,B).
There are only a few case reports in the literature where c-TGV has been associated with non-compaction of MRV2 and few cases have been reported with SVT.3 In our case, there was presence of SVT and non-compaction of MRV in a case of c-TGV.
Congenitally corrected transposition of great arteries (TGA) can be associated with non-compaction of morphological right ventricle.
Supraventricular tachyarrhythmias are a rare occurrence with corrected transposition of great vessels .
Cardiac MRI is most reliable investigation to diagnose non-compaction.
Contributors All authors involved in the management of this patient and approved the final version of this manuscript.
Competing interests None.
Patient consent Obtained.
Provenance and peer review Not commissioned; externally peer reviewed.