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What test uses sound waves to create images of the heart and assess its structure and function?
- A. Echocardiogram
- B. MRI
- C. CT scan
- D. X-ray
Correct Answer: A
Rationale: The correct answer is A: Echocardiogram. An echocardiogram uses sound waves to create images of the heart, providing detailed information about its structure and function. It is a non-invasive and safe test commonly used to diagnose various heart conditions. MRI (B) uses magnetic fields and radio waves, CT scan (C) uses X-rays, and X-ray (D) uses electromagnetic radiation, but none of these tests specifically utilize sound waves for imaging the heart.
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What term refers to the degree of myocardial fiber stretch before contraction, related to the volume of blood distending the ventricles at the end of diastole, and determined by the amount of venous return?
- A. Preload
- B. Afterload
- C. Contractility
- D. Ejection fraction
Correct Answer: A
Rationale: Rationale:
1. Preload refers to myocardial fiber stretch before contraction.
2. It is related to the volume of blood in ventricles at end of diastole.
3. Preload is determined by the amount of venous return to the heart.
4. It influences the force of contraction and stroke volume.
5. Afterload (B) is the resistance the heart must overcome to pump blood.
6. Contractility (C) is the intrinsic strength of the heart muscle.
7. Ejection fraction (D) is the percentage of blood ejected from ventricles.
Summary:
- Preload is correct as it specifically relates to fiber stretch and volume of blood.
- Afterload, contractility, and ejection fraction do not directly relate to ventricular volume and venous return.
The patient is experiencing chest pain and pain radiating to his arms, jaw, and back. The provider diagnosed his condition as a myocardial infarction. The patient asks what happened to him. The best response is:
- A. You cannot tell him what has happened; he needs to wait for the provider to return and explain what is going on currently.
- B. His aortic valve was malformed at birth causing a disruption in blood flow.
- C. All patients who are overweight like him will have a heart attack.
- D. One or more arteries that supply blood to his heart are blocked, thereby preventing an adequate amount of blood from getting to his cardiac muscles.
Correct Answer: D
Rationale: A myocardial infarction occurs when there is a blockage in one or more arteries supplying blood to the heart.
What test measures the pressure in the arteries during the contraction and relaxation of the heart?
- A. Blood pressure test
- B. Electrocardiogram (ECG or EKG)
- C. Spirometry
- D. Pulse oximetry
Correct Answer: A
Rationale: The correct answer is A: Blood pressure test. This test measures the pressure in the arteries during the heart's contraction (systolic pressure) and relaxation (diastolic pressure). It provides important information about heart health and overall cardiovascular function. The other choices are incorrect because B (ECG) measures the heart's electrical activity, C (Spirometry) measures lung function, and D (Pulse oximetry) measures oxygen saturation in the blood, not arterial pressure.
Clients taking diuretics for chronic congestive heart failure need to be taught to report
- A. 1-lb weight gain in 2 days
- B. Seeing yellow hazes around bright lights
- C. Change in the heart rate
- D. Change in activity tolerance
Correct Answer: A
Rationale: Weight gain indicates fluid retention.
This test measures the amount of blood the heart pumps with each beat, often used to assess heart function.
- A. Ejection fraction
- B. Cardiac output
- C. Stroke volume
- D. End-diastolic volume
Correct Answer: A
Rationale: The correct answer is A: Ejection fraction. Ejection fraction is the percentage of blood pumped out of the heart's left ventricle with each contraction. It is a key indicator of heart function and can help diagnose heart conditions such as heart failure. Cardiac output (B) is the total amount of blood pumped by the heart per minute, not the amount pumped with each beat. Stroke volume (C) is the amount of blood pumped by the heart in one contraction, not specifically with each beat. End-diastolic volume (D) is the amount of blood in the ventricle before contraction, not the amount pumped with each beat.