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A large number of investigations into the radiation doses from x-ray guided interventional cardiology procedures in children have been carried out in recent years. A review was conducted of these studies, gathering data on kerma area product (P KA), fluoroscopic screening time (FT), air kerma, and estimates of effective dose and organ doses. The majority of studies focus on P KA and FT with no estimation of dose to the patient. A greater than ten-fold variation in average P KA was found between different studies, even where data were stratified by patient age or weight. Typical values of P KA were 0.6–10 Gy· cm 2 (< 1 year/10 kg), 1.5–30 Gy· cm 2 (1–5 years), 2–40 Gy· cm 2 (5–10 years), 5–100 Gy· cm 2 (10–16 years) and 10–200 Gy· cm 2 (> 16 years). P KA was lowest for heart biopsy (0.3–10 Gy· cm 2 for all ages combined) and atrial septostomy (0.4–4.0 Gy· cm 2), and highest for pulmonary artery angioplasty (1 …