Angina pectoris is a major symptom of

Options

A. Myocardial infarction
B. Cyanosis
C. High blood pressure
D. Low blood pressure

Answer

**Step-by-Step Solution:**

1. **Understanding Angina Pectoris**: Angina pectoris is a medical term that refers to chest pain or discomfort that occurs when the heart muscle doesn't get enough oxygen-rich blood. It is often described as a feeling of pressure, squeezing, fullness, or pain in the center or left side of the chest.

2. **Identifying the Condition**: Angina pectoris is not a disease itself but a symptom of an underlying heart condition. The most common cause of angina is coronary artery disease (CAD), where the arteries that supply blood to the heart become narrowed or blocked.

3. **Linking to Myocardial Infarction**: Myocardial infarction, commonly known as a heart attack, occurs when blood flow to a part of the heart is blocked for a long enough time that part of the heart muscle is damaged or dies. Angina pectoris can be a precursor to myocardial infarction, indicating that the heart is not receiving enough blood and oxygen.

4. **Evaluating Other Options**:
- **Cyanosis**: This refers to a bluish discoloration of the skin due to lack of oxygen, but it is not directly related to angina pectoris.
- **High Blood Pressure**: While high blood pressure can contribute to heart disease, it is not a direct symptom of angina pectoris.
- **Low Blood Pressure**: This condition can lead to inadequate blood flow to organs but is not associated with angina pectoris.

5. **Conclusion**: Given that angina pectoris is a major symptom of myocardial infarction, the correct answer is **option A: myocardial infarction**.

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