Irradiation in paediatric and congenital cardiology is of major concern. Patients with single ventricle will be irradiated on several occasions during their life (CT-scan, cardiac catheterisation, and chest radiograph). Few data are available in the literature, on this subject.

Using a database of 64 patients with single ventricle, we developed a fictive patient undergoing. 1 cardiac CT-scan, 3 cardiac catheterisations (before Glenn procedure, before and after Fontan procedure), and 17-chest radiograph (mainly postoperative Glenn and Fontan procedure). Available radiation doses for each step were recorded and means added to estimate total irradiation of the fictive patient. Organ exposure was calculated.

Total irradiation in our fictive patient reached 5.8mSv, the distribution of the effective dose was: 45% by for CT-scan, 44% for cardiac catheterisations and 11% for chest radiography. Specific organ exposure analysis is ongoing.

CT-scan contributed the most to global irradiation. Organ exposure will be further analysed. The reduction of medical irradiation remains a major goal for congenital cardiology teams and will need further improvement of technologies and practices.