A group of nurses is reviewing the cardiovascular system and its function. Which statement by one of the nurses demonstrates an understanding of a child’s cardiovascular system?
“At birth, the infant’s right and left ventricle are about the same size.”
“The child’s heart doesn’t mature and function like an adult’s until between 8 and 10 years of age.”
“The heart rate of the child decreases whenever the child experiences a fever.”
“Between the ages of 5 and 6, the child’s left ventricle grows to about two times the size of the right.”
The Correct Answer is A
Choice A reason: At birth, the infant’s right and left ventricles are nearly equal in size due to fetal circulation demands. This aligns with pediatric cardiology, making it the correct statement demonstrating understanding of the newborn’s cardiovascular system as discussed in the nurses’ review session.
Choice B reason: The heart matures earlier, with adult-like function by early childhood, not 8-10 years. Equal ventricle size at birth is accurate, making this incorrect, as it overestimates the timeline for cardiovascular maturation in the nurse’s understanding of the child’s heart development.
Choice C reason: Heart rate typically increases with fever in children, not decreases, due to metabolic demands. Equal ventricle size at birth is correct, making this inaccurate and incorrect compared to the true statement about the infant’s cardiovascular system in the nurses’ review.
Choice D reason: The left ventricle grows slightly larger but not twice the right’s size by 5-6 years. Equal ventricles at birth is accurate, making this incorrect, as it exaggerates ventricular growth in the nurse’s understanding of the child’s cardiovascular system development.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
Choice A reason: For a 75-lb child (34 kg), the daily dose range is 1122-1632 mg (33-48 mg/kg). Divided by 4, each dose is 280.5-408 mg. 280 mg is slightly below the minimum, making this borderline and incorrect compared to a dose within the safe therapeutic range for administration.
Choice B reason: A 75-lb child weighs 34 kg (75 ÷ 2.2). The daily dose range is 1122-1632 mg (33-48 mg/kg), so per dose (÷4) is 280.5-408 mg. 375 mg falls within this range, aligning with pediatric pharmacology, making it the correct dosage to administer per dose.
Choice C reason: For a 75-lb child (34 kg), the daily dose range is 1122-1632 mg (33-48 mg/kg), with each dose (÷4) being 280.5-408 mg. 408 mg is at the maximum but within range, making this correct but less optimal than 375 mg, which is safer within the therapeutic window.
Choice D reason: A 75-lb child (34 kg) requires 1122-1632 mg daily (33-48 mg/kg), so each dose (÷4) is 280.5-408 mg. 250 mg is below the minimum, risking underdosing, making this incorrect compared to 375 mg, which is safely within the therapeutic range for the child.
Correct Answer is C
Explanation
Choice A reason: Using tweezers risks ear canal injury or pushing paper deeper in a 2-year-old, potentially causing trauma. Professional evaluation ensures safe removal, making this dangerous and incorrect compared to advising immediate medical attention to address the potential foreign object in the child’s ear safely.
Choice B reason: Delaying care for irritation risks complications like infection or eardrum damage from a foreign object in a 2-year-old. Immediate provider assessment is safer, making this inadequate and incorrect compared to prioritizing prompt medical evaluation for the child’s potential ear issue.
Choice C reason: Immediate care provider evaluation ensures safe removal of any paper, preventing ear damage or infection in a 2-year-old. Advising against inserting objects protects the child, aligning with pediatric safety protocols, making this the correct response to address the caregiver’s concern effectively.
Choice D reason: Washing the ear with a syringe may push paper deeper or injure a 2-year-old’s delicate ear canal. Professional intervention is needed, making this risky and incorrect compared to seeking immediate medical evaluation to safely address the potential foreign object in the child’s ear.
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