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What test evaluates the heart's response to physical stress, often involving exercise on a treadmill while monitoring the heart?
- A. Stress test
- B. Echocardiogram
- C. Holter monitor
- D. CT angiography
Correct Answer: A
Rationale: The correct answer is A: Stress test. This test evaluates the heart's response to physical stress by monitoring the heart's activity during exercise on a treadmill. It helps diagnose heart conditions such as coronary artery disease. Echocardiogram (B) is an ultrasound test that examines the heart's structure and function. Holter monitor (C) records the heart's activity over a period to detect irregularities. CT angiography (D) is a type of imaging test to visualize blood vessels. However, none of these options specifically assess the heart's response to physical stress like a stress test does.
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What structures hold up the AV valves and are anchored to the ventricular wall by the papillary muscles?
- A. Chordae tendineae
- B. Papillary muscles
- C. Semilunar valves
- D. Aortic valve
Correct Answer: A
Rationale: The correct answer is A: Chordae tendineae. These fibrous cords hold up the AV valves (mitral and tricuspid valves) and are anchored to the ventricular wall by the papillary muscles. The papillary muscles contract to prevent the AV valves from prolapsing into the atria during ventricular contraction. Choice B (Papillary muscles) is incorrect as they assist in the function but are not the structures that hold up the AV valves. Choices C (Semilunar valves) and D (Aortic valve) are incorrect as they are not directly involved in supporting the AV valves or anchored by the papillary muscles.
Which of the following symptoms is the first sign of aortic regurgitation?
- A. Water-hammer pulse
- B. Tachycardia
- C. Flushed skin
- D. Heart murmur
Correct Answer: A
Rationale: A water-hammer pulse is an early sign of aortic regurgitation due to backflow of blood into the left ventricle.
The nurse is administering a beta blocker to a client with a heart rate of 50 bpm. What is the priority action?
- A. Hold the beta blocker and notify the healthcare provider.
- B. Administer the beta blocker as ordered.
- C. Decrease the dose of the beta blocker.
- D. Monitor the client's heart rate and reassess in 30 minutes.
Correct Answer: A
Rationale: The correct answer is A because a heart rate of 50 bpm is below the normal range, and beta blockers further decrease heart rate. Holding the medication and notifying the healthcare provider is crucial to prevent potential bradycardia and adverse effects. Administering the beta blocker (choice B) can further reduce the heart rate. Decreasing the dose (choice C) may not be enough to address the issue. Monitoring the heart rate (choice D) is important but not sufficient to address the potential harm caused by administering the beta blocker.
Which term refers to high blood pressure, a condition where the force of the blood against the artery walls is too high?
- A. Hypertension
- B. Hypotension
- C. Hyperlipidemia
- D. Diabetes
Correct Answer: A
Rationale: The correct answer is A: Hypertension. Hypertension refers to high blood pressure, where the force of blood against artery walls is too high. This condition can lead to serious health issues. Hypotension (B) is low blood pressure. Hyperlipidemia (C) is high levels of fats/lipids in the blood. Diabetes (D) is a condition related to blood sugar regulation, not blood pressure. Therefore, A is the correct answer as it specifically relates to the condition described in the question.
What is a condition where the lung's alveoli are permanently enlarged and damaged, leading to shortness of breath?
- A. Emphysema
- B. Bronchitis
- C. Atelectasis
- D. Pulmonary fibrosis
Correct Answer: A
Rationale: The correct answer is A: Emphysema. Emphysema is a condition where the lung's alveoli are permanently enlarged and damaged, causing shortness of breath. This occurs due to the destruction of the alveoli walls, leading to decreased surface area for oxygen exchange. This results in difficulty breathing and reduced oxygen supply to the body. Bronchitis (B) is inflammation of the bronchial tubes, not alveoli damage. Atelectasis (C) is the collapse of lung tissue, not enlargement. Pulmonary fibrosis (D) is scarring of lung tissue, not alveoli enlargement.