Nokea
Isovolumic contraction phase of ventricular systole occurs during which of the following phases of central venous pressure, approximately
- A. From nadir of y descent to peak of a wave
- B. From peak of a wave to trough of x wave
- C. From trough of x wave to peak of c wave
- D. From peak of c wave to trough of x' descent
Correct Answer: C
Rationale: Isovolumic contraction occurs from the trough of the x wave to the peak of the c wave.
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A father asks why his child with tetralogy of Fallot seems to favor a squatting position. What is the nurse's best response?
- A. Squatting increases the return of venous blood back to the heart.
- B. Squatting decreases arterial blood flow away from the heart.
- C. Squatting is a common resting position when a child is tachycardic.
- D. Squatting increases the workload of the heart.
Correct Answer: A
Rationale: The squatting position allows the child to breathe more easily because systemic venous return is increased.
When caring for an 11-month-old infant with dehydration and metabolic acidosis, the nurse expects to see which of the following?
- A. A reduced white blood cell count
- B. A decreased platelet count
- C. Shallow respirations
- D. Tachypnea
Correct Answer: D
Rationale: Tachypnea is a compensatory mechanism in metabolic acidosis to help expel excess carbon dioxide and correct the acid-base imbalance.
Deafness can develop due to:
- A. Unconjugated hyperbilirubinaemia in the newborn
- B. Pneumococcal meningitis
- C. Alport syndrome
- D. Cleft palate
Correct Answer: B
Rationale: Pneumococcal meningitis is a known cause of sensorineural hearing loss due to inflammation and damage to the cochlea.
Epiphyseal changes are seen in:
- A. Non-accidental injury
- B. Rickets
- C. Chronic renal failure
- D. Lead poisoning
Correct Answer: B
Rationale: Rickets is characterized by epiphyseal changes due to defective mineralization of growing bones.
The child becomes unresponsive. The most likely underlying lesion is
- A. cardiomyopathy
- B. anomalous coronary artery
- C. tetralogy of Fallot
- D. constipation
Correct Answer: C
Rationale: Tetralogy of Fallot can cause hypoxic spells leading to unresponsiveness.