A child with asthma has the following medication ordered: Theophylline 4 mg/kg/dose every 6 hrs. The child weighs 4.69 kg. Calculate the appropriate dose.
33.6 mg
18.7 mg
8.4 mg
19 mg
The Correct Answer is B
To calculate the appropriate dose of Theophylline for the child weighing 4.69 kg:
Dose = Weight (kg) × Dose (mg/kg)
Dose = 4.69 kg × 4 mg/kg
Dose = 18.76 mg
So, the appropriate dose is approximately 18.7 mg.
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Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
To calculate the appropriate dose of Theophylline for the child weighing 4.69 kg:
Dose = Weight (kg) × Dose (mg/kg)
Dose = 4.69 kg × 4 mg/kg
Dose = 18.76 mg
So, the appropriate dose is approximately 18.7 mg.
Correct Answer is A
Explanation
A. Machine-like murmur.
This option is correct. A characteristic clinical manifestation of a large patent ductus arteriosus is a continuous "machine-like" murmur heard on auscultation. This murmur is typically heard best at the upper left sternal border and may radiate to the back.
B. Chronic hypoxemia.
Chronic hypoxemia is not typically a primary manifestation of a large PDA. While PDA can lead to increased pulmonary blood flow and potentially contribute to pulmonary congestion, chronic hypoxemia may not be a prominent feature unless complications such as heart failure develop.
C. Cyanosis with crying.
Cyanosis with crying is more commonly associated with cyanotic congenital heart defects such as tetralogy of Fallot. While PDA can contribute to cyanosis in certain circumstances, it is not typically a consistent clinical manifestation.
D. Weak pulse.
A weak pulse is not typically associated specifically with a large PDA. Infants with PDA may have bounding pulses due to increased blood flow through the ductus arteriosus.
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