ST segment elevation on EKG is not seen in
**Core Concept**
ST segment elevation on an electrocardiogram (EKG) is a significant finding that indicates myocardial injury, often due to **acute coronary syndrome** or other cardiac conditions. The **ST segment** represents the period of ventricular repolarization.
**Why the Correct Answer is Right**
Since the options are missing, let's discuss a common scenario where ST segment elevation is not seen: in certain types of myocardial infarction, specifically non-ST elevation myocardial infarction (NSTEMI), where the damage does not result in significant ST elevation.
**Why Each Wrong Option is Incorrect**
**Option A:** Would be incorrect if it suggested a condition always associated with ST elevation, such as **ST-elevation myocardial infarction (STEMI)**.
**Option B:** Might be a condition like **pericarditis**, which can cause ST elevation.
**Option C:** Could be a choice that implies ST elevation is present, like **acute coronary syndrome** with STEMI.
**Option D:** Might suggest a condition where ST elevation is a hallmark, such as **Prinzmetal’s angina**.
**Clinical Pearl / High-Yield Fact**
A key point to remember is that not all myocardial infarctions present with ST segment elevation; some, like NSTEMI, do not.
**Correct Answer:** D. Non-ST elevation myocardial infarction (NSTEMI)