ST segment monitoring for ischemia has gained increasing importance with the advent of thrombolytic therapy. The most accurate method for monitoring the existence of true ischemic changes is
a. T-wave inversion in leads overlying the ischemia.
b. ST segment depression in leads overlying the ischemia.
c. adjusting the gain control on bedside monitoring for best visualization.
d. 12-lead ECG for confirmation.
D
Cardiac biomarkers are proteins that are released from damaged myocardial cells. The initial elevation of cTnI, cTnT, and CK-MB occurs 3 to 6 hours after the acute myocardial damage. This means that if an individual comes to the emergency department as soon as chest pain is experienced, the biomarkers will not have risen. For this reason, it is clinical practice to diagnose an acute myocardial infarction by 12-lead electrocardiography and clinical symptoms without waiting for elevation of cardiac biomarkers.
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