What is the recommended time for a child with varicella to return to school?
After all the blisters have crusted over
After receiving the varicella vaccine
After completing one week of antiviral medication
As soon as the rash appears
The Correct Answer is A
A. A child with varicella (chickenpox) should return to school only after all the blisters have crusted over, indicating that the infectious stage has passed and they are no longer contagious.
B. Receiving the varicella vaccine does not apply to children who already have the infection; vaccination is preventive, not a treatment for those already infected.
C. Completing one week of antiviral medication is not a sufficient criterion for returning to school, as the child may still be contagious until all lesions are crusted.
D. Returning to school as soon as the rash appears is not safe, as the child is highly contagious during the initial rash stage and until all lesions have crusted.
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Correct Answer is B
Explanation
A. Tricuspid atresia typically leads to decreased pulmonary blood flow due to the absence of normal blood flow to the lungs.
B. Patent ductus arteriosus results in increased pulmonary blood flow because it allows blood to flow from the aorta to the pulmonary artery, increasing the volume of blood going to the lungs.
C. Coarctation of the aorta can cause decreased blood flow to the lower body, which may not directly relate to increased pulmonary blood flow.
D. Tetralogy of Fallot is characterized by decreased pulmonary blood flow due to right ventricular outflow obstruction, making it not associated with increased pulmonary blood flow.
Correct Answer is A
Explanation
A. Distributive shock, particularly in the context of anaphylaxis, is characterized by widespread vasodilation that leads to a decrease in systemic vascular resistance and impaired blood flow to organs despite normal or increased cardiac output.
B. This option is incorrect because distributive shock involves decreased systemic vascular resistance due to vasodilation rather than an increase.
C. This statement describes hypovolemic shock, not distributive shock. Distributive shock is not primarily caused by the loss of blood volume.
D. While loss of myocardial contractility can lead to cardiogenic shock, it is not the mechanism behind distributive shock, which is related to vascular tone rather than heart function.