Introduction This study aims at identifying the high-dose procedures in a cardiology department and to find correlation factors to predict the risk of occurrence of deterministic effects in terms of relevant indicators. Materials and methods A working group composed of medical physicists, interventional cardiologists and Radiation Safety Officer was created. DOSITRACE platform, allowing automated data collection and historical patient dosimetry was installed. A couple of approaches have been implemented: a risk management approach that is oriented toward a prevention-based perspective and another risk management approach that is oriented toward a curative-based perspective. Results The use of DOSITRACE in clinical routine has enabled us to identify the recanalization of Chronic Total Occlusion (CTO) as the one which may deliver the highest patient radiation dose. Subsequently, the working group has become interested in this procedure to figure out the factors that determine the escalation of the radiation dose delivered to the patient. The results are as follows: ● An average reduction of 15% of the radiation dose delivered to the patient through a process of optimization of the dose was obtained. ● A correlation between the BMI, the beam angulation and patient radiation dose was found. ● For the procedure for recanalization of CTO, an increase in dose in terms of the complexity factor J-CTO score was highlighted: Score = [0, 1, 2, 3, 4]: Average Dose Area Product (DAP) = [152,160,244,299,418 Gy cm2]. In parallel, the group has worked on the equivalent dose effect of the entrance skin doses delivered for the repeated interventions in order to predict the occurrence of deterministic effects due to cumulative dose. A method, published by the team Balter et al. in 2010 was implemented in DOSITRACE. For the case of the repeated recanalization of CTO, we have implemented an innovative predictive risk method depending on the J-CTO score and BMI. A radiochromic film dosimetry was implemented in a systematic manner for CTO procedures to measure precisely the maximum skin dose delivered to the patient (Peak Skin Dose PSD), a real risk indicator. Conclusion This project has enabled us to identify the high-dose procedures and to implement methods to predict the risk of deterministic effects occurring, both based on the cumulating PSD for the repeated recanalization of CTO interventions, and the J-CTO Score.
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