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Different degrees of coronary artery stenosis. (a) There was no obvious stenosis in the right coronary artery. (b) 50% stenosis in the distal segment of anterior descending artery. (c) 80% stenosis in the middle segment of right coronary artery. (d) 95% stenosis in the middle segment of anterior descending artery, and 95% stenosis in the anterior and middle segments of circumflex branch.
