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What is the primary action of digoxin when prescribed to a patient with heart failure?
- A. Increase heart rate
- B. Decrease cardiac output
- C. Strengthen cardiac contractions
- D. Lower blood pressure
Correct Answer: C
Rationale: The primary action of digoxin in heart failure is to strengthen cardiac contractions. Digoxin inhibits the sodium-potassium pump, leading to an increase in intracellular calcium levels, which enhances the force of myocardial contractions. This helps improve cardiac output and symptoms of heart failure.
Explanation:
A: Incorrect - Digoxin does not increase heart rate, it mainly affects the strength of contractions.
B: Incorrect - Digoxin does not decrease cardiac output; it actually helps improve it by enhancing contractility.
D: Incorrect - Digoxin may have a slight effect on lowering blood pressure, but its primary action in heart failure is to strengthen cardiac contractions, not lower blood pressure.
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A patient with chronic heart failure is prescribed carvedilol. What is the primary purpose of this medication?
- A. Increase cardiac output
- B. Reduce fluid retention
- C. Decrease heart rate
- D. Lower blood pressure
Correct Answer: C
Rationale: The correct answer is C: Decrease heart rate. Carvedilol is a beta-blocker that works by blocking the beta-adrenergic receptors in the heart, leading to a decrease in heart rate. This helps reduce the workload of the heart and improve its efficiency in patients with heart failure. Choice A is incorrect because carvedilol may not necessarily increase cardiac output directly. Choice B is incorrect because carvedilol focuses more on improving heart function rather than directly reducing fluid retention. Choice D is incorrect because while carvedilol may lower blood pressure as a secondary effect, its primary purpose in heart failure is to improve cardiac function by decreasing heart rate.
An elderly female client comes to the clinic for a regular check-up. The client tells the nurse that she has increased her daily doses of acetaminophen (Tylenol) for the past month to control joint pain. Based on this client's comment, what previous lab values should the nurse compare with today's lab report?
- A. Look at last quarter's hemoglobin and hematocrit to assess for dehydration.
- B. Look for an increase in today's LDH compared to the previous one to assess for possible liver damage.
- C. Expect to find an increase in today's APTT compared to last quarter's due to bleeding.
- D. Determine if there is a decrease in serum potassium due to renal compromise.
Correct Answer: B
Rationale: The correct answer is B. The nurse should look for an increase in today's LDH compared to the previous one to assess for possible liver damage. Acetaminophen overdose can lead to liver toxicity, which can be indicated by elevated LDH levels. LDH is an enzyme released during liver damage. Checking for LDH levels can help assess the impact of increased acetaminophen doses on the liver.
Choices A, C, and D are incorrect:
A: Looking at hemoglobin and hematocrit is not directly related to acetaminophen use for joint pain. It does not provide information about liver damage.
C: APTT measures blood clotting time and is not directly affected by acetaminophen use for joint pain. It does not provide information about liver damage.
D: Serum potassium levels are not typically affected by acetaminophen use for joint pain. It does not provide information about liver damage.
A client with heart failure is prescribed furosemide (Lasix). Which instruction should the nurse include in the client's teaching plan?
- A. Take the medication before bedtime.
- B. Report any weight gain of more than 2 pounds in a day.
- C. Increase your intake of high-sodium foods.
- D. Limit your fluid intake to less than 1 liter per day.
Correct Answer: B
Rationale: The correct answer is B: Report any weight gain of more than 2 pounds in a day. This instruction is crucial for a client with heart failure taking furosemide as sudden weight gain can indicate fluid retention, which can worsen heart failure. Monitoring weight daily can help detect early signs of fluid overload.
A: Taking the medication before bedtime is not a critical instruction for furosemide as it is usually taken in the morning to prevent nocturia.
C: Increasing intake of high-sodium foods contradicts the purpose of furosemide, which is a diuretic used to reduce fluid retention by promoting diuresis.
D: Limiting fluid intake to less than 1 liter per day can lead to dehydration and electrolyte imbalances, which can be harmful for a client with heart failure.
For a patient with asthma, what is the primary purpose of prescribing montelukast?
- A. Relieve acute bronchospasm
- B. Prevent asthma attacks
- C. Thin respiratory secretions
- D. Suppress cough
Correct Answer: B
Rationale: The primary purpose of prescribing montelukast for a patient with asthma is to prevent asthma attacks. Montelukast is a leukotriene receptor antagonist that helps to reduce inflammation in the airways, thereby preventing asthma symptoms and attacks. It is not used to relieve acute bronchospasm (Choice A), as it is not a fast-acting rescue medication like a bronchodilator. Montelukast also does not thin respiratory secretions (Choice C) or suppress cough (Choice D) as its main mechanism of action is to prevent and control asthma symptoms by inhibiting leukotrienes.
A patient with depression is prescribed fluoxetine. What is an important side effect for the nurse to monitor?
- A. Weight gain
- B. Bradycardia
- C. Dry mouth
- D. Suicidal thoughts
Correct Answer: D
Rationale: The correct answer is D: Suicidal thoughts. When a patient with depression is prescribed fluoxetine, there is a risk of increased suicidal thoughts, especially in the initial weeks of treatment. This is important for the nurse to monitor because it can lead to serious consequences. Weight gain (A) is a common side effect of fluoxetine but not as critical to monitor as suicidal thoughts. Bradycardia (B) and dry mouth (C) are not common side effects of fluoxetine and are less relevant to monitor in this scenario. Monitoring for suicidal thoughts is crucial for patient safety.