A nurse is assisting with the care of a client who was admitted to the telemetry unit after he experienced chest pain, dyspnea and diaphoresis. Which of the following ECG findings is a manifestation of acute myocardial infarction?

A. A QRS interval of 0.08 second is within the normal range (0.06–0.10 sec). B. A PR interval of 0.15 second is normal (0.12–0.20 sec). C. ST-segment elevation above the isoelectric line is a classic ECG finding of acute myocardial infarction (STEMI). D. The QT interval should be less than half of the R–R interval; equaling the full R–R interval is not typical and does not indicate MI.