Successful Cardiac Resynchronization Therapy With Defibrillator Implantation in a Patient With Isolated Dextrocardia and Situs Inversus Totalis: Role of High‐Resolution Three‐Dimensional Computed Tomography in Procedural Planning

Preprocedural 3D-CT identified a suitable posterolateral coronary vein in a patient with dextrocardia and situs inversus. Right-sided CRT-D implantation guided by 3D imaging achieved optimal lead positioning and biventricular pacing, underscoring the importance of preprocedural anatomical planning in complex congenital settings.