Nokea
The differential in a 5-year old with a 2-week history of painful joints is all the following except:
- A. Viral polyarthritis
- B. Rheumatoid arthritis
- C. Lyme disease
- D. Rheumatic fever
Correct Answer: B
Rationale: rheumatoid arthritis is rare in a 5-year-old with a 2-week history of joint pain. The other options (a-d) are more likely differentials.
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Features differentiating renal tubular acidosis type II from type I include:
- A. Increased anion gap
- B. Nephrocalcinosis
- C. Urinary pH can be lowered < 5.5 in ammonium chloride loading test in type I
- D. Aminoaciduria
Correct Answer: C
Rationale: In type I renal tubular acidosis, urinary pH can be lowered below 5.5 during an ammonium chloride loading test, unlike in type II.
A nurse cares for a client who has advanced cardiac disease and states, I am having trouble sleeping at night. How should the nurse respond?
- A. I will consult the provider to prescribe a sleep study to determine the problem.
- B. You become hypoxic while sleeping; oxygen therapy via nasal cannula will help.
- C. A continuous positive airway pressure, or CPAP, breathing mask will help you breathe at night.
- D. Use pillows to elevate your head and chest while you are sleeping.
Correct Answer: D
Rationale: Elevating the head and chest can reduce fluid accumulation in the lungs, improving breathing and sleep quality in clients with advanced cardiac disease.
Which finding might delay a cardiac catheterization procedure on a 1-year-old?
- A. 30th percentile for weight
- B. Severe diaper rash
- C. Allergy to soy
- D. Oxygen saturation of 91% on room air
Correct Answer: B
Rationale: A severe diaper rash may indicate potential infection, which is a contraindication for the standard groin approach during catheterization.
The following syndromes are due to chromosomal abnormalities:
- A. Cri-du-chat syndrome
- B. Kearns-Sayre syndrome
- C. Marfan's syndrome
- D. Turner's syndrome
Correct Answer: D
Rationale: Turner's syndrome: Turner's syndrome is caused by a monosomy of the X chromosome (45,X), leading to characteristic features such as short stature and ovarian insufficiency.
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.