unit 4a: heart problems
questions
1. what causes coronary heart disease?

2. what are three methods of treating coronary heart disease?
a.
b.
c.
3. what is an advantage of stents?

4. how do stents work?

5. what is a disadvantage of bypass surgery?

Question

unit 4a: heart problems
questions
1. what causes coronary heart disease?

2. what are three methods of treating coronary heart disease?
 a.
 b.
 c.
3. what is an advantage of stents?

4. how do stents work?

5. what is a disadvantage of bypass surgery?

Accepted Answer

### Question 1: What causes coronary heart disease?
# Brief Explanations:
Coronary heart disease (CHD) is mainly caused by the buildup of fatty deposits (atherosclerosis) in the coronary arteries. Risk factors include high cholesterol, high blood pressure, smoking, diabetes, obesity, lack of physical activity, and a family history of heart disease. These factors lead to the narrowing or blockage of the arteries that supply blood to the heart, reducing blood flow and oxygen to the heart muscle.
# Answer:
Coronary heart disease is mainly caused by atherosclerosis (buildup of fatty deposits, cholesterol, etc.) in the coronary arteries, often due to risk factors like high cholesterol, high blood pressure, smoking, diabetes, obesity, inactivity, and family history.

### Question 2: What are three methods of treating coronary heart disease?
# Brief Explanations:
- **a. Lifestyle changes**: This includes adopting a heart - healthy diet (low in saturated and trans fats, high in fruits, vegetables, and whole grains), regular physical activity, quitting smoking, and managing stress. These changes can help reduce risk factors and improve heart health.
- **b. Medication**: Drugs such as statins (to lower cholesterol), beta - blockers (to lower blood pressure and reduce heart rate), and anti - platelet agents (like aspirin to prevent blood clots) are commonly used to manage CHD.
- **c. Medical procedures**: Procedures like angioplasty with stenting (to open blocked arteries) and coronary artery bypass graft (CABG) surgery (to create a new path for blood flow around blocked arteries) are used to treat more severe cases.
# Answer:
a. Lifestyle changes (e.g., diet, exercise, quitting smoking)
b. Medication (e.g., statins, beta - blockers, aspirin)
c. Medical procedures (e.g., angioplasty with stenting, CABG)

### Question 3: What is an advantage of stents?
# Brief Explanations:
Stents are small mesh tubes inserted into blocked arteries. One major advantage is that they can quickly restore blood flow to the heart muscle. The procedure (angioplasty with stenting) is less invasive than bypass surgery, has a shorter recovery time, and can be done on an outpatient basis in some cases. It also helps to keep the artery open, reducing the risk of the artery narrowing again immediately after the procedure.
# Answer:
An advantage of stents is that they can quickly restore blood flow to the heart muscle, the procedure is less invasive than bypass surgery with a shorter recovery time, and they help keep the artery open.

### Question 4: How do stents work?
# Brief Explanations:
During an angioplasty procedure, a stent (a small, expandable mesh tube) is delivered to the blocked coronary artery using a catheter. Once in place, the stent is expanded (either by a balloon in balloon - expandable stents or by the self - expanding nature of some stents). This expansion pushes the plaque against the artery wall, opening the artery and restoring blood flow. The stent then remains in the artery to help keep it open and prevent it from narrowing again.
# Answer:
Stents are delivered to a blocked coronary artery via a catheter. They are expanded (by a balloon or self - expansion) to push plaque against the artery wall, opening the artery and restoring blood flow, and then remain to keep the artery open.

### Question 5: What is a disadvantage of bypass surgery?
# Brief Explanations:
Coronary artery bypass graft (CABG) surgery is a major surgical procedure. One disadvantage is that it is invasive, requiring a large incision in the chest (usually to access the heart). It has a relatively long recovery period compared to less invasive procedures like angioplasty with stenting. There are also risks associated with major surgery, such as infection, bleeding, and damage to other organs. Additionally, the surgery may not be suitable for all patients, especially those with other serious health conditions.
# Answer:
A disadvantage of bypass surgery (CABG) is that it is invasive (requires a large chest incision), has a long recovery period, and carries risks of major surgery (infection, bleeding, organ damage), and may not be suitable for all patients.

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Explanation:

Question 1: What causes coronary heart disease?

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Question 2: What are three methods of treating coronary heart disease?