心电图是心脏检查中最重要、最常用的一种方法。但是,事物总是一分为二的。心血管专科医生发现,一些冠心病病人胸痛发作时,心电图却正常。在住院病人中也发现胸痛明显,但心电图反复监测却完全正常,有的伴有心动过缓,有的伴有恶心呕吐、头晕等症状,数天后发展为急性心肌梗死。他们还发现,许多冠心病急性胸痛发作的病人,事后心电图也 ECG is the most important and commonly used method of heart examination. However, things are always divided into two parts. Cardiovascular specialists found that some patients with coronary heart disease chest pain attack, the ECG is normal. Chest pain was also found in hospitalized patients, but repeated monitoring of ECG was completely normal, some accompanied by bradycardia, and some accompanied by nausea and vomiting, dizziness and other symptoms, the development of acute myocardial infarction after a few days. They also found that many patients with acute chest pain in coronary heart disease also had ECG afterwards