Radiation exposure during transcatheter aortic valve implantation (TAVI): comparison of balloon-expandable versus self-expandable prostheses

• Published in: European heart journal Vol. 43; no. Supplement_2
• Main Authors: Arnold, M, Nemec, S, Kondruweit, M, Marwan, M, Achenbach, S
• Format: Journal Article
• Language: English
• Published: 03-10-2022
• ISSN: 0195-668X; 1522-9645
• DOI: 10.1093/eurheartj/ehac544.2084

Abstract

Transcatheter aortoc valve implantation (TAVI) is performed under fluoroscopic control and can be associated with the need for long fluoroscopy times and repeated cine acquisitions in angulated projections. The procedural steps for TAVI with balloon-expandable and self-expanding prostheses differ and may be associated with significant differences in radiation exposure. Published data regarding patient or operator radiation exposure in TAVI are limited to small series. We therefore analyzed the influence of prosthesis type on radiation exposure in a consecutive series of 1185 patients who underwent TAVI between 2016 and 2021.
A cohort of 1185 consecutive patients undergoing TAVI between 2016 and 2021 was analyzed. Radiation exposure was determined by evaluating overall fluoroscopy time, the number of acquired cine sequences, and total dose-area product (DAP). After eliminating patients treated via a non-transfemoral approach, data between patients underging TAVI with self-expanding prostheses and patients undergoing TAVI with balloon-expandable prostheses were compared.
Out of the total patient cohort, 46 patients were excluded due to treatment via a non-transfemoral approach. Of the remaining 1139 patients, 437 (38%) were treated with self-expandable prostheses and 702 (62%) were treated with balloon-expandable prostheses. Median age was 81 years, 45% of patients were female. Body weight was slightly but significantly higher in patients treated by balloon-expandable prostheses (median 73 kg vs. 79 kg, p<0.001). Median fluoroscopy time was 453 s (IQR 365–603 s) for self-expandable prostheses vs. 414 s (IQR 341–540 s) for balloon-expandable prostheses (p=0.002). Also, the number of cine acqusitions was significantly higher (median 12 vs. 7; p<0.001), and total DAP was 6442 mGy cm2 (IQR 4452–9669 mGy cm2) for self-expandable vs. 4798 (IQR 3353–6981 mGy cm2) for balloon-expandable prostheses (p<0.001, see Fig. 1). In multivariable analysis, male sex, higher body weight and use of a self-expandable prosthesis were independently associated with higher total DAP.
Transcatheter aortic valve implantation using balloon-expandable prostheses is associated with significantly lower total dose-area product than treatment with self-expandable prostheses. This may be particularly relevant for operators who perform the procedure frequently.
Funding Acknowledgement
Type of funding sources: None.