Operator radiation exposure during right or left transradial coronary angiography: A phantom study.

Abstract

Previous studies showed a possible lower radiation dose absorbed by operators comparing LRA and RRA for percutaneous coronary procedures. The reasons of this lower radiation dose are not well known. The aim of this study was to evaluate the radiation dose absorbed by operators comparing left with right radial access (LRA and RRA respectively) during a simulated diagnostic coronary angiography using a phantom. A coronary angiography examination was simulated on a phantom by 5 operators using eight projections with 5 seconds fluoroscopy each. Each operator was equipped with 4 electronic dosimeters placed at thorax, at left wrist, at left head and at hip level. Radiation doses were expressed in picosievert and normalized by dose area product. LRA compared to RRA was associated with a significant lower operator dose at wrist (36pSv/cGYcm(2) [IQR 18-59pSv/cGYcm(2)] and 48pSv/cGYcm(2) [IQR 22-148pSv/cGYcm(2)] respectively, p=0.01) and thorax (3pSv/cGYcm(2) [IQR 2-5pSv/cGYcm(2)] and 10pSv/cGYcm(2) [6-23pSv/cGYcm(2)] respectively, p<0.001) but with a significant higher radiation dose at hip level (102pSv/cGYcm(2) [IQR 44-199pSv/cGYcm(2)] and 67pSv/cGYcm(2) [IQR 39-132pSv/cGYcm(2)] respectively, p=0.02). Conversely the radiation dose at left side of the head did not show significant differences between the two approaches. In this phantom study simulating a diagnostic coronarography the use of LRA compared to RRA was associated with a significant lower radiation dose at wrist and thorax but with an increased dose at hip level. To evaluate the radiation dose absorbed by operators comparing left with right radial access (LRA and RRA respectively) we simulated a diagnostic coronary angiography using a dedicated phantom. Operators were equipped with dedicated electronic dosimeters at wrist, hip, head and thorax level. LRA compared to RRA was associated with a significant lower operator dose at wrist and thorax but with a significant higher radiation dose at hip level whereas the radiation dose at left side of the head did not show significant differences between the two approaches.