Assessment of radiation doses received by patients during endoscopic retrograde cholangiopancreatography according to disease location

Objective: patients are exposed to ionizing radiation during endoscopic retrograde cholangiopancreatography (ERCP). Radiation dose depends on multiple factors. The goal of this study was to assess fluoroscopy time (FT), radiation doses and effective dose (ED) during ERCP according to the condition being treated. Materials and methods: a descriptive study was performed of 369 consecutive ERCPs from January 2017 to June 2019. Patient demographic and procedure data were collected. FT, cumulative dose area product (DAP), fluoroscopy DAP, DA fluoroscopy, air kerma, and number of radiographs were assessed. ED was estimated using specific conversion factors. Results: the mean age was 73.34 years and 193 subjects were male. Mean FT was 4.56 [+ or -] 0.17 min, cumulative DAP was 2,056.73 [+ or -] 188.83 cGyc[m.sup.2], fluoroscopy DAP was 1,722.90 [+ or -] 82.26 cGyc[m.sup.2] and air kerma was 85.84 [+ or -] 4.93 mGy. The number of radiographs was 2.10 [+ or -] 0.07 and the mean ED was 5.34 [+ or -] 0.49 mSv. FT was significantly longer for choledocholithiasis (CL), proximal malignant biliary stricture (PMBS) and distal malignant biliary stricture (DMBS) versus others (OT). Cumulative DAP was higher for PMBS (p < 0.002). FT, cumulative DAP, fluoroscopy DAP and air kerma values were significantly higher for complicated CL as compared to simple CL. ED was higher for CL, DMBS and PMBS, but only significantly (p < 0.002) for PMBS. Conclusions: FT for ERCP is variable and increases with exploration difficulty. Thus, it is longer in the case of PMBS, as well as with the amount of radiation received by the patients and ED. Keywords: Radiation. Fluoroscopy time. ERCP. Effective dose.