Final answer:
STEMI on an EKG typically starts with ST-segment elevation, progresses to Q wave enlargement as the infarct develops, and may include T wave inversion as a later change, reflecting the scar formation in the myocardial tissue.
Step-by-step explanation:
The typical evolution of the EKG in the setting of a STEMI involves several characteristic changes. Initially, the ECG may reveal ST-segment elevation due to acute injury. As time progresses, the ST segment can return to baseline, and an enlarged Q wave may develop, indicating a myocardial infarction (MI). Additionally, T waves can become inverted following an MI, signifying repolarization abnormalities. Over time, the EKG changes reflect the formation of a scar in the myocardial tissue. Comparing a recent ECG to a previous one can help detect these changes more effectively as individual heart variations can impact ECGs. Portable ECG monitors have become increasingly sophisticated, allowing for more immediate evaluation and diagnosis in various settings.