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. The PR intervals are 0.15 second: PR interval 0.12–0.20 s is normal and not diagnostic of MI. B. The QT interval is equal to the R to R interval: That relationship would imply a very long QT (or very slow rate) and is not a standard MI marker. C. The QRS intervals are 0.08 second: Normal QRS duration is ≈0.06–0.10 s; a 0.08 s QRS is normal and not indicative of MI. D. The ST segment is above the isoelectric line: ST-segment elevation above the isoelectric line is a classic ECG sign of acute transmural myocardial infarction (STEMI).