A 56-year-old man presents in the casualty with severe chest pain and difficulty in breathing. His ECG was taken immediately. The below ECG suggest the following diagnosis:
**Core Concept**
The ECG in question is likely to show signs of an acute myocardial infarction (AMI), specifically ST-elevation myocardial infarction (STEMI), due to the occlusion of a major coronary artery. This condition leads to ischemia and subsequent necrosis of the myocardial tissue.
**Why the Correct Answer is Right**
The ECG in STEMI typically shows ST-segment elevation in two or more contiguous leads, with the ST-segment being at least 1 mm in amplitude. This elevation is indicative of transmural myocardial infarction, where the infarction involves the full thickness of the myocardium. The ST-segment elevation is due to the blockage of the coronary arteries, which leads to a lack of blood flow to the affected area of the heart, resulting in myocardial ischemia.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect as it does not specify the characteristic ECG changes associated with STEMI. A normal ECG would not show ST-segment elevation.
**Option B:** This option is incorrect as it does not describe the typical ECG findings in STEMI. A non-ST-elevation myocardial infarction (NSTEMI) would show ST-segment depression or T-wave inversion, but not ST-segment elevation.
**Option C:** This option is incorrect as it does not accurately describe the ECG changes associated with STEMI. A pericarditis ECG would show widespread ST-segment elevation, but it would be more diffuse and not limited to the leads corresponding to the affected coronary artery.
**Clinical Pearl / High-Yield Fact**
A key feature of STEMI is the presence of ST-segment elevation in two or more contiguous leads, which can help differentiate it from other cardiac conditions. This is a classic ECG finding that should prompt immediate action to restore blood flow to the affected area of the heart.
**Correct Answer:** A.