Using the 12-lead ECG in the diagnosis of myocardial infarction with ST-segment elevation provides data to facilitate rapid reperfusion therapies. In this article, case studies are used to compare 12-lead ECGs obtained before and after early percutaneous coronary intervention.

Analysis of the 12-lead electrocardiogram (ECG) reveals crucial data in patients with suspected acute myocardial infarction. Distinguishing ST-segment elevation from other acute coronary syndromes facilitates rapid and appropriate intervention. Clinical research1,2 has shown the effectiveness of rapid reperfusion in reducing the amount of myocardial damage and improving outcomes in patients with myocardial infarction and ST-segment elevation. Two reperfusion strategies are recommended in the updated guidelines3 from the American College of Cardiology and the American Heart Association for patients who have had signs and symptoms of acute myocardial infarction for less than 12 hours: (1) administration of thrombolytic agents less than 30 minutes after admission and (2) arrival in...

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