Which statement about ST-segment elevation in diagnosing MI is correct?

Which statement about ST-segment elevation in diagnosing MI is correct?

• A. ST elevations are the most consistent sign of MI
• B. ST elevations never occur in MI
• C. ST elevations only occur in NSTEMI
• D. ST elevations indicate pulmonary embolism

Answer: (A)

ST-segment elevation on an ECG reflects acute transmural myocardial injury and is the hallmark finding that defines STEMI, signaling the need for immediate reperfusion therapy. This makes it the best description among the options: it correctly ties ST elevation to a significant and urgent MI diagnosis. It’s not correct to say ST elevations never occur in MI, and NSTEMI typically does not show ST elevation. ST elevations can occur in other conditions too, but in the MI context they most strongly point to STEMI rather than pulmonary embolism.

ST-segment elevation on an ECG reflects acute transmural myocardial injury and is the hallmark finding that defines STEMI, signaling the need for immediate reperfusion therapy. This makes it the best description among the options: it correctly ties ST elevation to a significant and urgent MI diagnosis. It’s not correct to say ST elevations never occur in MI, and NSTEMI typically does not show ST elevation. ST elevations can occur in other conditions too, but in the MI context they most strongly point to STEMI rather than pulmonary embolism.