{'fraction_non_alphanumeric': 0.009823182711198428, 'fraction_numerical': 0.0, 'mean_word_length': 5.219512195121951, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
[Chronic obstructions of the left main and right coronary arteries].

The authors report a case of chronic occlusion of the left main coronary associated with occlusion of the second segment of the right coronary artery documented at coronary angiography carried out for effort angina without previous infarction. Myocardial perfusion was preserved mainly by a marginal branch of the right coronary arising immediately before the occluded second segment and by a small branch of the left main coronary artery.