{'fraction_non_alphanumeric': 0.019851116625310174, 'fraction_numerical': 0.007444168734491315, 'mean_word_length': 4.683098591549296, '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}}
Isolated ST elevation in lead aVR during TMT at high workload as a marker of ostioproximal LAD occlusion

ST segment elevation in lead aVR of a resting ECG along with ST segment depression in multiple other leads during acute coronary syndrome (ACS) has been previously described to be a predictive marker of critical stenosis of the left main coronary artery or proximal left anterior descending artery (LAD).1 The importance of isolated ST segment elevation in lead aVR during a treadmill test (TMT) has never been stressed on before.

We present an interesting case of a 49-year-old man who presented with anginal chest pain, without a prior history of diabetes, hypertension or smoking. TMT performed 4 months ago was reported negative by an experienced physician. There was ST elevation of 1.5 mm at …