Question

Evidence of myocardial injury on a 12 lead ECG will produce an ST segment as which of the following?

A. Elevated above the baseline, equal to or greater than 1 mm
B. Depressed below the baseline, equal to or greater than 1 mm
C. Isoelectric with no elevation or depression noted
D. Located in the precordial leads only

Answer 1

An ST segment that is elevated above the baseline by equal to or greater than 1 mm on a 12-lead ECG indicates myocardial injury, often associated with an acute myocardial infarction (STEMI).

Step-by-step explanation:

Evidence of myocardial injury on a 12-lead ECG can produce an ST segment that is elevated above the baseline, equal to or greater than 1 mm. This elevation of the ST segment is commonly associated with an acute myocardial infarction (MI), referred to as an ST-elevated MI (STEMI). The ST segment may also appear depressed below the baseline in conditions of myocardial hypoxia, although for the identification of myocardial injury, specifically the ST elevation is the primary indicator. Cardiac magnetic resonance imaging and echocardiography, as well as blood tests for creatine kinase MB and cardiac troponin, can also be used to confirm an MI alongside ECG findings.