Persistent left superior vena cava discovered during pacemaker implantation in paediatric patient

A 12-year-old boy with a history of congenitally corrected transposition of the great arteries (ccTGA) underwent pacemaker (PM) implantation due to advanced conduction disorders (numerous episodes of 1st, 2nd and 3rd degree atrioventricular (AV) block). During the procedure, persistent left superior vena cava (PLSVC) was discovered. Although this finding required supplementary manoeuvring, the ventricular lead was successfully placed into the sub-pulmonary chamber and the procedure was completed without complications.