An artifical pace-maker is implanted subcutaneously and connected to the heart in patients

Options

A. having 90% blockage of the three main coronary arteries
B. having a very high blood pressure
C. with irregularity in the heart rhythm
D. suffering from arteriosclerosis

Answer

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks about the conditions under which an artificial pacemaker is implanted subcutaneously and connected to the heart.

2. **Identifying the Purpose of a Pacemaker**: An artificial pacemaker is a medical device that helps regulate the heartbeat. It is primarily used in patients with irregular heart rhythms (arrhythmias).

3. **Analyzing the Options**:
- **Option A**: Patients with 90% blockage of the three main coronary arteries. This condition may require other interventions, such as bypass surgery or stenting, rather than a pacemaker.
- **Option B**: Patients with very high blood pressure. High blood pressure itself does not typically require a pacemaker.
- **Option C**: Patients with irregularity in the heart rhythm. This is a primary indication for the implantation of a pacemaker, as it helps maintain a regular heartbeat.
- **Option D**: Patients suffering from arteriosclerosis. While arteriosclerosis can affect blood flow, it does not directly indicate the need for a pacemaker.

4. **Conclusion**: Based on the analysis, the correct answer is **Option C**: Patients with irregularity in the heart rhythm are the ones who typically receive an artificial pacemaker.