Multicenter Prospective Evaluation of Patient Radiation Exposure During Fenestrated-Branched Endovascular Aortic Repair: A Ten-year Experience.

Objective: To assess patient radiation exposure as reflected by cumulative air kerma (CAK) and dose area product (DAP) during fenestrated-branched endovascular aortic repair (FB-EVAR).

Summary Background Data: Patient radiation exposure during FB-EVAR has been reported inconsistently.

Methods: Data from 2,111 patients enrolled in 10 physician-sponsored investigational device exemption studies (2012-2022) were analyzed from the United States Aortic Research Consortium database. Procedures were performed using seven fixed imaging systems (A to G). Patients were classified into three groups by imaging era: 2012-2015 (Group 1), 2016-2018 (Group 2), and 2019-2022 (Group 3). Primary endpoints were CAK and DAP risk factors, assessed using linear mixed-effect models. Secondary endpoints were diagnostic reference levels (DRL) for FB-EVAR.

Results: Of the 2,111 patients (71% males; mean 74±9 years years-old) treated by FB-EVAR; 263 (12%) were in Group 1, 541 (26%) in Group 2, and 1,307 (62%) in Group 3. Use of ≥4 vessel stent-graft designs increased from 69% (Group 1) to 79% (Group 3) (P<0.001). Median CAK decreased from 3,644 mGy (Group 1) to 1,753 mGy (Group 3), and DAP from 441 Gy.cm² to 208 Gy.cm² (P<0.001). Higher BMI, iliac branch device (IBD) use, and longer fluoroscopy time (FT) were associated with increased CAK and DAP, while experienced operators and systems D, F, and G were protective (P<0.05). DRLs for Group 3 were 2,800 mGy (CAK) and 340 Gy.cm² (DAP).

Conclusions: Radiation exposure during FB-EVAR significantly decreased over time. Higher BMI, IBD use, and FT were linked to increased exposure, while experienced operator and System D, F or G were protective. Trial registration: URL: https://www.clinicaltrials.gov; Unique identifiers: NCT02043691 NCT00583817 NCT00483249 NCT01937949 NCT02050113 NCT02323581 NCT01874197 NCT01654133 NCT02266719.