A 60 year old male presented with acute chest pain of 4 hours duration. Electrocardiographic examination revealed new Q wave with ST segment depression. He succumbed to his illness within 24 hours of admission. The heart revealed presence of a transmural haemorrhagic area over the septum and anterior wall of the left ventricle. Light microscopic examination is most likely to reveal –

**Core Concept**
The question is testing the understanding of the pathophysiology of myocardial infarction (MI), specifically the differences between transmural and non-transmural infarcts. Transmural infarcts involve the full thickness of the heart wall, whereas non-transmural infarcts involve only the subendocardial layer.

**Why the Correct Answer is Right**
The presence of a transmural hemorrhagic area over the septum and anterior wall of the left ventricle suggests a full-thickness infarction. This type of infarct is typically caused by occlusion of a major coronary artery, leading to coagulative necrosis of the affected myocardium. The new Q wave with ST segment depression on the ECG is consistent with this diagnosis. The coagulative necrosis seen in transmural infarcts is characterized by the preservation of the cell outline, with the cytoplasm becoming eosinophilic and the nuclei pyknotic.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not specify the type of infarct, and the presence of a transmural hemorrhagic area suggests a full-thickness infarct, not a non-transmural one.
**Option B:** This option is incorrect because it mentions liquefactive necrosis, which is more characteristic of infarcts caused by ischemia in solid organs such as the brain, not the heart.
**Option C:** This option is incorrect because it mentions granulomatous inflammation, which is not typically seen in myocardial infarction.

**Clinical Pearl / High-Yield Fact**
It's essential to remember that the presence of a new Q wave on the ECG, especially in the context of chest pain, suggests a transmural myocardial infarction. This is a classic exam trap, and students should be able to recognize the characteristic ECG changes associated with different types of infarcts.

**Correct Answer: D. Coagulative necrosis**

✓ Correct Answer: B. Necrotic myofibres with presence of neutrophils