Table 2.

Angiographic and technical characteristics of patients undergoing percutaneous coronary interventions (PCI) for chronic total occlusion with and without contrast-associated acute kidney injury (CA-AKI).

Variable	Overall (n = 2801)	No CA-AKI (n = 2482)	CA-AKI (n = 319)	P
J-CTO Score*	2.5 ± 1.2	2.5 ± 1.2	2.9 ± 1.2	< 0.001
Moderate/severe calcification	67.0%	65.8%	76.0%	< 0.001
Target vessel:				0.875
LM	1.0%	1.0%	0.9%
LAD	25.2%	24.9%	27.3%
CX	24.2%	24.5%	22.3%
RCA	49.1%	49.1%	48.9%
Graft	0.6%	0.6%	0.6%
Radial access used	28.2%	28.9%	23.2%	0.034
Rotational atherectomy	6.0%	5.3%	11.3%	< 0.001
Crossing strategy used:				0.029
Antegrade-only	70.8%	71.4%	65.5%
Retrograde	29.2%	28.6%	34.5%
Number of DES used (n)†	2 (1, 3)	2 (1, 3)	2 (1, 3)	0.209
Overall stent length [mm]†	56 (36, 86)	56 (36, 86)	64 (38, 94)	0.012
Multivessel PCI	27.0%	26.4%	31.4%	0.0601
Technical success	90.2%	90.5%	87.2%	0.056

^*Mean ± standard deviation;

^†Median (interquartile range);

CTO — chronic total occlusion; CX — circumflex artery; DES — drug eluting stent; J-CTO — Japanese Chronic Total Occlusion; LAD — left anterior descending artery; LM — left main artery; RCA — right coronary artery