Surgical repair for patent ductus arteriosus (PDA) is done to prevent the complication of
Increased pulmonary vascular congestion
decreased workload on the jet side of the heart
pulmonary Infection
Right-to-left shunt of blood
The Correct Answer is A
PDA is a congenital heart defect where a blood vessel called the ductus arteriosus, which is supposed to close shortly after birth, remains open. This allows oxygenated blood from the aorta to flow back into the pulmonary artery, leading to increased pulmonary blood flow and congestion. Over time, this can lead to increased pulmonary vascular congestion and potentially cause complications such as pulmonary hypertension and heart failure.
Surgical repair of PDA, often through a procedure known as ligation or closure of the ductus arteriosus, is performed to stop this abnormal blood flow and prevent the associated complications, particularly the increase in pulmonary vascular congestion.
The other options (B, C, and D) are not the primary complications associated with PDA and surgical repair is not performed primarily to address these issues:
B. Decreased workload on the left side of the heart is not a primary reason for surgical repair of PDA, although it can be a potential benefit of closing the ductus arteriosus.
C. Pulmonary infection is not a direct complication of PDA, but the increased pulmonary blood flow associated with a large PDA can make the lungs more susceptible to respiratory infections.
D. Right-to-left shunt of blood is not a typical complication of PDA. PDA typically involves left-to-right shunting of blood, with oxygenated blood flowing back into the pulmonary circulation, leading to complications related to increased pulmonary blood flow.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
To calculate the safest dose of amoxicillin for Archie based on his weight of 44 pounds (lbs) and the recommended dose of 50 mg/kg/day in two divided doses, you should follow these steps:
Step 1: Convert Archie's weight from pounds (lbs) to kilograms (kg).
1 pound = 0.453592 kilograms
44 lbs * 0.453592 kg/lb = 19.504 kg (rounded to the nearest tenth)
Step 2: Calculate the total daily dose based on his weight.
Total daily dose = Weight (kg) * Dose (mg/kg/day)
Total daily dose = 19.504 kg * 50 mg/kg/day = 975.2 mg/day
Step 3: Divide the total daily dose into two equal doses since it's to be administered in two divided doses.
Each dose = Total daily dose / 2
Each dose = 975.2 mg/day / 2 = 487.6 mg/dose
Since it's not possible to administer a fraction of a milligram accurately, you would round the dose to the nearest available dosage strength.
Therefore, the safest dose for Archie would be:
500 mg
So, Archie should take 500 mg of amoxicillin before his dentist appointment.
Correct Answer is D
Explanation
Tetralogy of Fallot is a congenital heart defect characterized by a combination of four specific heart abnormalities:
Ventricular septal defect (VSD): A hole in the wall (septum) between the two lower chambers (ventricles) of the heart.
Overriding aorta: The aorta is positioned over both the left and right ventricles, allowing oxygen-poor (deoxygenated) blood from the right ventricle to mix with oxygen-rich (oxygenated) blood from the left ventricle.
Pulmonic stenosis: Narrowing of the pulmonary valve or artery, which restricts blood flow from the right ventricle to the lungs.
Right ventricular hypertrophy: The right ventricle becomes thicker and more muscular as it works harder to pump blood against the narrowed pulmonary valve or artery.
The combination of these defects results in deoxygenated blood from the right ventricle being pumped into the systemic circulation, leading to cyanosis (blueness of the skin) due to decreased oxygen levels in the arterial blood.
The other options (A, B, and C) describe different congenital heart defects but do not specifically result in cyanosis due to deoxygenated blood entering the systemic circulation:
A. Coarctation of the aorta results in the narrowing of the aorta but does not directly lead to cyanosis from the mixing of oxygen-poor blood.
B. Aortic stenosis involves narrowing of the aortic valve but does not typically result in cyanosis in the same way as Tetralogy of Fallot.
C. Patent ductus arteriosus (PDA) involves a connection between the aorta and pulmonary artery but does not cause cyanosis from mixing to the extent seen in the Tetralogy of Fallot.
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