**Question:** 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 autopsy revealed the presence of a transmural haemorrhagic area over the septum and anterior wall of the left ventricle. Light microscopic examination is most likely to reveal -

A. Inflammatory cells
B. Neurons
C. Neurons
D. Cardiomyocytes

**Correct Answer:** D. Cardiomyocytes

**Core Concept:**

Acute myocardial infarction (AMI) is a clinical condition characterized by the death of cardiomyocytes due to a severe reduction in blood flow, typically caused by a coronary artery occlusion. The electrocardiogram (ECG) changes, such as new Q wave and ST segment depression, are indicative of myocardial ischemia and infarction. In the context of this question, the patient's clinical presentation, ECG findings, and autopsy results indicate an acute myocardial infarction.

**Why the Correct Answer is Right:**

The correct answer is **D. Cardiomyocytes** because they are the primary cells that make up the myocardium (heart muscle tissue). In an acute myocardial infarction (AMI), these cells die due to severe ischemia, leading to the ECG changes described. The autopsy findings of "transmural haemorrhagic area over the septum and anterior wall of the left ventricle" further support the diagnosis of AMI, as these areas are typically affected in ST-elevation myocardial infarction (STEMI), a type of AMI characterized by a large area of myocardial necrosis.

**Why Each Wrong Option is Incorrect:**

A. **Inflammatory cells (Option A)** are not the primary cell type affected in acute myocardial infarction. Inflammatory cells are present during the healing phase after myocardial infarction, not during the event itself.

B. **Neurons (Option B)** are the nerve cells found in the central nervous system, not in the heart tissue. Neurons are not relevant to this question.

C. **Neurons (Option C)** are the same as Option B; they are not present in heart tissue.

**Clinical Pearl:**

Understanding the pathophysiology of myocardial infarction is crucial for clinical diagnosis and management. The correct answer, **D. Cardiomyocytes**, highlights the primary target cells affected during an AMI, while the wrong options (A, B, C, and E) represent cells not found in the heart tissue or are not relevant to the specific event being discussed (infarction).