A 62-year-old man presents with severe substernal chest pain. He is diagnosed with an acute ST-segment elevation myocardial infarction (STEMI). In the absence of immediate reperfusion therapy, electrocardiographic (ECG) changes in the affected leads typically evolve in a predictable chronological sequence. Arrange the following classic ECG findings in the chronological order of their appearance, from earliest to latest.
- 1Hyperacute, peaked T waves
- 2ST-segment elevation
- 3Pathologic Q waves
- 4T-wave inversion
Answer
The correct chronological sequence is: Hyperacute, peaked T waves → ST-segment elevation → Pathologic Q waves → T-wave inversion.
The classic evolution of ECG changes during an acute ST-segment elevation myocardial infarction (STEMI) follows a predictable timeline. Within the first few minutes, hyperacute, peaked T waves appear. Over the next several minutes to hours, ST-segment elevation develops, marking the acute injury phase. Over hours to days, pathologic Q waves form, representing established myocardial necrosis. Finally, over days to weeks, as the ST segment returns to baseline, the T waves invert.
Step-by-Step Solution
Key Concept
Chronological evolution of ECG changes in acute transmural myocardial infarction