Persistent left superior vena cava is a congenital anomaly that occurs as a result of a degenerative condition in the left anterior cardinal vein. It is found in 3% of healthy subjects and up to 10% of those with congenital heart disease. It is generally an incidental finding, while performing invasive procedures, which may complicate the implantation of cardiac antiarrhythmic devices. The case of a patient with persistent left superior vena cava and absent right superior vena cava is reported. The patient had a history of surgical correction of anomalous pulmonary venous connection, developed sinus node disease and required permanent dual-chamber pacemaker implantation.
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