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Using coronary CT angiography for guiding invasive coronary angiography: potential role to reduce intraprocedural radiation exposure

Christophe T Arendt, Patricia Tischendorf, Julian L Wichmann, Michael Messerli, Lucas Jörg, Niklas Ehl, Robin F Gohmann, Simon Wildermuth, Thomas J Vogl & Ralf W Bauer

abstract

OBJECTIVES
We investigated the potential reduction of patient exposure during invasive coronary angiography (ICA) if the procedure had only been directed to the vessel with at least one ≥ 50% stenosis as described in the CT report.

METHODS
Dose reports of 61 patients referred to ICA because of at least one ≥ 50% stenosis on coronary CT angiography (CCTA) were included. Dose-area product (DAP) was documented separately for left (LCA) and right coronary arteries (RCA) by summing up the single DAP for each angiographic projection. The study population was subdivided as follows: coronary intervention of LCA (group 1) or RCA (group 2) only, or of both vessels (group 3), or further bypass grafting (group 4), or no further intervention (group 5).

RESULTS
57.4% of the study population could have benefitted from reduced exposure if catheterization had been directly guided to the vessel of interest as described on CCTA. Mean relative DAP reductions were as follows: group 1 (n = 18), 11.2%; group 2 (n = 2), 40.3%; group 3 (n = 10), 0%; group 4 (n = 3), 0%; group 5 (n = 28), 28.8%.

CONCLUSIONS
Directing ICA to the vessel with stenosis as described on CCTA would reduce intraprocedural patient exposure substantially, especially for patients with single-vessel stenosis.

KEY POINTS
• Patients with CAD can benefit from decreased radiation exposure during coronary angiography. • ICA should be directed solely to significant stenoses as described on CCTA. • Severely calcified plaques remain a limitation of CCTA leading to unnecessary ICA referrals.
   
citation Arendt C T, Tischendorf P, Wichmann J L, Messerli M, Jörg L, Ehl N, Gohmann R F, Wildermuth S, Vogl T J, Bauer R W. Using coronary CT angiography for guiding invasive coronary angiography: potential role to reduce intraprocedural radiation exposure. Eur Radiol 2018; 28:2756-2762.
   
type journal paper/review (English)
date of publishing 07-02-2018
journal title Eur Radiol (28/7)
ISSN electronic 1432-1084
pages 2756-2762
PubMed 29417250
DOI 10.1007/s00330-018-5317-2