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What is cardiac power output (CPO) in a patient with acute anterior wall ST-elevation myocardial infarction and left ventricular failure? His mean arterial pressure was 60 mm Hg and cardiac output calculated on echo was 2.91l min−1.
- A. 0.48
- B. 0.38
- C. 0.58
- D. 0.68
Correct Answer: C
Rationale: Cardiac power output is calculated as (MAP × cardiac output) / 451. For the given values, the correct calculation gives a value of 0.58.
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An asymptomatic 45-year old male with newly diagnosed atrial fibrillation and normal echo, refused cardioversion while suggested. The next optimal management strategy for him is
- A. Sedate and cardiovert against patient wishes
- B. Aspirin
- C. Anticoagulation
- D. Rate control
Correct Answer: D
Rationale: Rate control is the optimal management strategy for asymptomatic atrial fibrillation when cardioversion is refused.
Of the following, the MOST common clinical sign of coarctation of the aorta in older children is
- A. cardiac enlargement
- B. notching of the inferior border of the ribs
- C. a systolic ejection click or thrill in the suprasternal notch
- D. differential blood pressure: arms > legs
Correct Answer: B
Rationale: Notching of the ribs due to collateral circulation is a classic sign of coarctation of the aorta.
Which is the most appropriate nursing action related to the administration of digoxin (Lanoxin) to an infant?
- A. Counting the apical rate for 30 seconds before administering the medication
- B. Withholding a dose if the apical heart rate is less than 100 beats/min
- C. Repeating a dose if the child vomits within 30 minutes of the previous dose
- D. Checking respiratory rate and blood pressure before each dose
Correct Answer: B
Rationale: As a rule, if the pulse rate of an infant is below 100 beats/min, the medication is withheld and the physician is notified.
A parent brings a toddler, age 19 months, to the clinic for a regular check-up. When palpating the toddler’s fontanels, what should the nurse expects to find?
- A. Closed anterior fontanel and open posterior fontanel
- B. Open anterior and fontanel and closed posterior fontanel
- C. Closed anterior and posterior fontanels
- D. Open anterior and posterior fontanels
Correct Answer: C
Rationale: By 19 months, both the anterior and posterior fontanels should be closed as the skull bones have fused.
In 90% of cases of endocarditis, the causative agent is recovered from the first 2 blood cultures. Antimicrobial pretreatment of the patient reduces the yield of blood cultures to
- A. 10%
- B. 20%
- C. 30%
- D. 40%
Correct Answer: A
Rationale: Antimicrobial pretreatment can significantly reduce the yield of blood cultures, often to 10-20%.