Table III.

Published studies reporting the prevalence of coronary chronic total occlusions.

	Country	CTO prevalence among CAD patients without prior CABG	CTO prevalence among prior CABG patients
Fefer et al.(1)	Canada	18.4%	54%
Kahn et al.(2)	USA	35%	NR
Werner et al.(4)*	Germany	33%	NR
Christofferson et al.(3)†	USA	52%	NR
Present study	USA	31%	89%

CABG=coronary artery bypass graft; CAD=coronary artery disease (≥50% stenosis in ≥1 vessel); CTO=chronic total occlusion; NR=not reported

^*In patients presenting with stable angina

^†CAD defined as ≥70% stenosis in ≥1 vessel