The effect of technological improvements on radiation dose and contrast volume during cardiac catheterization has received limited study. We compared the cumulative air kerma, fluoroscopy time, and contrast dose before and after installation of new X-ray systems in 14,051 procedures performed between 2018 and 2021 at a tertiary US center. Cumulative air kerma (AK) increased after new X-ray system installation by 94 mGy (95% CI [55, 133], p < 0.001). After adjusting for baseline characteristics, (age, body mass index, bifurcation lesion, complexity) the estimated increase was 61 mGy (30, 92), p < 0.001. Adjusting for fluoroscopy time, the estimated increase was 45 mGy (24, 66), p < 0.001. The estimated increase compared with 2018 was 40 mGy (11, 69), p = 0.007. Fluoroscopy time also by 1.0 min (95% CI 0.54, 1.5, p < 0.001). Adjusting for baseline characteristics, the estimated increase was 0.54 (95% CI 0.15, 0.93, p = 0.006). Fluoroscopy time was similar between 2018 and 2021 (0.07 min, 95% CI -0.44, 0.58, p = 0.8). Contrast volume was similar in the pre and post group (difference 0.00 mL, 95% CI -3.2, 3.2, p > 0.9). After adjusting for baseline characteristics, contrast volume did not significantly decrease (mean difference 2.9 mL, 95% CI-0.07, 5.9, p = 0.056). Fluoroscopy time and radiation dose increased from 2018-2021 after the introduction of new technologies. More research is needed to understand the underlying reasons and improve radiation safety in the cardiac catheterization laboratory.
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