Supraventricular Tachycardia in Situs Inversus Totalis and Congenitally Corrected Transposition of the Great Arteries.

We share a rare case of an older adult patient with situs inversus totalis (mirror image of all viscera, including dextrocardia) and congenitally corrected transposition of the great arteries who presented with supraventricular tachycardia. We highlight the unique electrocardiographic characteristics of these rare conditions and the importance of electrocardiogram interpretation skills. (Level of Difficulty: Advanced.).