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To the Editor: A 73‐year‐old female was referred to our hospital for evaluation of unstable angina pectoris. She had a greater than 10‐year history of hypertension. Coronary angiography (CAG) was performed in another hospital in March 2017, which showed diffuse calcific stenosis (about 90%) in the proximal and mid‐left anterior descending (LAD) artery, 70% stenosis in the ostial obtuse marginal branch, and no apparent stenosis in the right coronary artery. The lesion in the LAD could not be intervened because the 2.0 mm × 15.0 mm Sprinter balloon (Medtronic, USA) could not be expanded and the 2.5 mm × 15.0 mm NC Sprinter balloon (Medtronic, USA) could not pass through the lesion.

Application of Excimer Laser Coronary Atherectomy Guided by Optical Coherence Tomography in the Treatment of a Severe Calcified Coronary Lesion