Cardiol Cardiovasc Med 2020; 4 (3): 172-175 DOI: 10.26502/fccm.92920114 Cardiology and Cardiovascular Medicine Vol. 4 No. 3 – June 2020. [ISSN 2572-9292] 172 Case Report Arterial Switch Operation for Late-Presenting Transposition of Great Arteries with Intact Ventricular Septum: 2 Case Reports Evelien Cools 1 , Duy-Anh Nguyen 2 , Yacine Aggoun 2 , Tornike Sologashvili 3* 1 Department of Anaesthesiology, Hôpitaux Universitaires de Genève, Geneva, Switzerland 2 Pediatric Cardiology Unit, Department of Paediatric Subspecialties, Hôpitaux Universitaires de Genève, Geneva, Switzerland 3 Department of Cardiovascular Surgery, Hôpitaux Universitaires de Genève, Geneva, Switzerland *Corresponding author: Tornike Sologashvili, Department of Cardiovascular Surgery, Hôpitaux Universitaires de Genève, Rue Gabrielle-Perret-Gentil 4, 1205 Geneva, Switzerland. Tel: +4122 37 27 638; Email: Tornike.Sologashvili@hcuge.ch Received: 23 April 2020; Accepted: 02 May 2020; Published: 13 May 2020 Citation: Evelien Cools, Duy-Anh Nguyen, Yacine Aggoun, Tornike Sologashvili. Arterial Switch Operation for Late-Presenting Transposition of Great Arteries with Intact Ventricular Septum: 2 Case Reports. Cardiology and Cardiovascular Medicine 4 (2020): 172-175. Abstract The arterial switch operation (ASO) is the regular procedure to correct D-transposition of the great arteries (D-TGA) with intact ventricular septum (IVS) in the first 21 days of life. We describe 2 cases where ASO was performed in late-presenting D-TGA with IVS. In both cases, despite a short preload time of left ventricle (LV) training due to complications, ASO was performed. Correction was successful, without requiring heavy postoperative support. Patients with late-presenting D-TGA with IVS may undergo ASO, even after a short first-stage period. Keywords: Congenital heart surgery; Transposition of the great arteries; Arterial switch operation; Left ventricle training Introduction To correct D-transposition of the great arteries (D-TGA) with intact ventricular septum (IVS), arterial switch operation (ASO) [1] in the first 21 days of life before deconditioned LV [2] is standard surgery. After 3 weeks of