Nokea
What test measures the electrical activity of the heart to detect arrhythmias and other heart conditions?
- A. Electrocardiogram (ECG or EKG)
- B. Chest X-ray
- C. Stress test
- D. Arterial blood gas (ABG)
Correct Answer: A
Rationale: The correct answer is A: Electrocardiogram (ECG or EKG). An ECG measures the electrical activity of the heart by recording the heart's rhythm and electrical signals. It is used to detect arrhythmias and other heart conditions based on the pattern of the electrical waves. A chest X-ray (B) is used to visualize the heart and lungs, not to measure electrical activity. A stress test (C) assesses the heart's response to physical activity. Arterial blood gas (D) measures oxygen and carbon dioxide levels in the blood, not heart activity. Thus, the ECG is the most appropriate test for detecting arrhythmias and other heart conditions.
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Two weeks ago, a 63-year-old patient with heart failure received a new prescription for carvedilol (Coreg) 3.125 mg orally. Upon evaluation in the outpatient clinic you find these symptoms. Which is of most concern?
- A. Complaints of increased fatigue and dyspnea.
- B. Weight increase of 0.5 kg in 2 weeks.
- C. Bibasilar crackles audible in the posterior chest.
- D. Sinus bradycardia, rate 50, as evidenced by ECG.
Correct Answer: D
Rationale: Bradycardia can impair cardiac output, especially in heart failure patients.
What accurately describes the pathophysiology of CAD?
- A. Partial or total occlusion of the coronary artery occurs during the stage of raised fibrous plaque
- B. Endothelial alteration may be caused by chemical irritants such as hyperlipidemia or by tobacco use
- C. Collateral circulation in the coronary circulation is more likely to be present in the young patient with CAD
- D. The leading theory of atherogenesis proposes that infection and fatty dietary intake are the basic underlying causes of atherosclerosis
Correct Answer: B
Rationale: Endothelial damage initiates plaque formation.
What is the condition where a blood clot blocks an artery in the lungs, causing shortness of breath, chest pain, and other symptoms?
- A. Pulmonary embolism
- B. Pneumothorax
- C. Pleural effusion
- D. Aneurysm
Correct Answer: A
Rationale: The correct answer is A: Pulmonary embolism. A pulmonary embolism occurs when a blood clot travels to the lungs and blocks an artery, leading to symptoms like shortness of breath and chest pain. This happens because the clot obstructs blood flow to the lung tissue, causing a decrease in oxygen levels. The other choices, B: Pneumothorax, C: Pleural effusion, and D: Aneurysm, do not involve a blood clot blocking an artery in the lungs. Pneumothorax is a collapsed lung due to air in the chest cavity, Pleural effusion is the accumulation of fluid in the space between the lungs and chest wall, and an Aneurysm is a bulging and weakened blood vessel.
What are the pressure-sensitive structures located in the aortic and carotid bodies called?
- A. Baroreceptors
- B. Chemoreceptors
- C. Nociceptors
- D. Mechanoreceptors
Correct Answer: A
Rationale: The correct answer is A: Baroreceptors. Baroreceptors are pressure-sensitive structures that detect changes in blood pressure in the aortic and carotid bodies. They help regulate blood pressure by sending signals to the brain to adjust heart rate and blood vessel dilation. Chemoreceptors (B) detect changes in chemical composition, not pressure. Nociceptors (C) detect pain stimuli. Mechanoreceptors (D) detect mechanical stimuli, not specifically pressure changes. Therefore, the correct answer is A as baroreceptors specifically respond to changes in blood pressure.
Two months after Mr. Edwards' myocardial infarction, which goal assumes highest priority?
- A. Having his wife perform most of his activities of daily living
- B. Following a weight-reduction diet
- C. Developing a physical-conditioning program
- D. Assisting him to prepare for retirement
Correct Answer: C
Rationale: Physical conditioning promotes long-term health.