Nodal re-entry in patient with persistent left superior vena cava and absent right superior vena cavaAbstract Nodal re-entrant tachycardia is the most common arrhythmia among the paroxysmal atrioventricular tachycardias, with the slow-fast variant being the most common.In many cases, the ablation of the slow pathway is the definitive treatment in many cases, often with a high rate of success and low frequency of complications.The presence of a left superior vena cava and the absence of a right superior vena cava with systematic venous drainage above the coronary sinus is a rare congenital malformation that leads to anatomical anomalies.