Complete heart block after mediastinal irradiation in a patient with the Wolff-Parkinson-White syndrome.

Radiation therapy is the current standard therapy for several malignant disorders, including Hodgkin's disease. Cardiac complications, pericardial disease in particular, may develop long after the treatment. However, conduction disorders have rarely been described. We report a patient with the Wolff-Parkinson-White syndrome who developed complete heart block 16 years after mediastinal radiation therapy.