All of the following statements regarding the ECG changes in acute pericarditis are true, except:
**Core Concept**
The ECG changes in acute pericarditis reflect the inflammatory process affecting the pericardium and, potentially, the myocardium. **Acute pericarditis** is characterized by chest pain and specific ECG findings. The ECG changes can evolve over time, reflecting the progression of the disease.
**Why the Correct Answer is Right**
Given the nature of acute pericarditis, the typical ECG changes include widespread ST-segment elevation in leads I, II, III, aVL, aVF, and V2-V6, due to the inflammation of the pericardium. However, without specific options provided, the key concept to understand is that the ECG changes are due to the inflammatory process and can mimic other conditions such as myocardial infarction but typically do not show Q-waves.
**Why Each Wrong Option is Incorrect**
**Option A:** Would be incorrect if it stated that acute pericarditis typically presents with Q-waves, as Q-waves are more indicative of myocardial infarction.
**Option B:** Might be incorrect if it suggested that the ST-segment elevation is limited to only one or two leads, which is not typical for acute pericarditis.
**Option C:** Could be incorrect if it mentioned that T-wave inversion occurs early in the disease process, as this usually occurs later.
**Option D:** Would be incorrect if it stated that the ECG changes are localized to only one area of the heart, which contradicts the diffuse nature of pericarditis.
**Clinical Pearl / High-Yield Fact**
A key point to remember is that the ECG changes in acute pericarditis are diffuse, involving multiple leads, and the ST-segment elevation is typically concave upwards. This is a critical distinction from the ECG changes seen in acute myocardial infarction.
**Correct Answer:** D. The ECG changes are localized to only one area of the heart.