Abstract： To the editor:The reader of the Chinese Medical Journal read with great enthusiasm an interesting and exciting case report and a review of the literature “Reversible ischemia on treadmill exercise in left main coronary artery vasospasm” by Hung et al1 who describe two patients who are referred for coronary angiography due to positive treadmill exercise testing and diagnosed of left main coronary artery (LMCA) vasospasm.They offered a successful medical treatment composed of a calcium channel blocker with follow-up based on treadmill exercise testing for both patients.