After administering varicella vaccine to a five-year-old child, which instruction should the nurse provide the child's parent?

Choice A reason: The lumen of the aorta reduces the volume of blood flow to the lower extremities is the correct pathophysiologic mechanism that supports the findings. This is because coarctation of the aorta is a congenital condition that causes a narrowing of the aorta, usually near the ductus arteriosus. This results in increased resistance to blood flow from the heart to the lower body, leading to higher blood pressure and stronger pulses in the upper extremities and lower blood pressure and weaker pulses in the lower extremities.

Choice B reason: The aortic semilunar valve obstructs blood flow into the systemic circulation is not the correct pathophysiologic mechanism that supports the findings. This is because the aortic semilunar valve is located at the base of the aorta and prevents blood from flowing back into the left ventricle. If the valve is obstructed, it would cause aortic stenosis, which is a different condition from coarctation of the aorta. Aortic stenosis would cause symptoms such as chest pain, shortness of breath, and fainting.

Choice C reason: The pulmonic valve prevents adequate blood volume into the pulmonary circulation is not the correct pathophysiologic mechanism that supports the findings. This is because the pulmonic valve is located at the base of the pulmonary artery and prevents blood from flowing back into the right ventricle. If the valve is obstructed, it would cause pulmonic stenosis, which is a different condition from coarctation of the aorta. Pulmonic stenosis would cause symptoms such as cyanosis, fatigue, and heart murmur.

Choice D reason: An opening in the atrial septum causes a murmur due to a turbulent left to right shunt is not the correct pathophysiologic mechanism that supports the findings. This is because an opening in the atrial septum is a defect in the wall that separates the two upper chambers of the heart. It would cause a condition called atrial septal defect, which is different from coarctation of the aorta. Atrial septal defect would cause symptoms such as difficulty breathing, frequent respiratory infections, and heart palpitations.

Choice A reason: Giving prescribed intravenous antibiotics is not the first action that the nurse should take. Antibiotics are used to treat the infection and inflammation caused by appendicitis, but they are not enough to prevent the complications of a ruptured appendix. The nurse should administer the antibiotics as ordered, but only after notifying the healthcare provider of the change in the child's condition.

Choice B reason: Inquiring about the client's last meal is not the first action that the nurse should take. The last meal may be relevant for the preparation of the surgery, but it is not urgent or related to the sudden relief of pain. The nurse should ask about the last meal as part of the preoperative assessment, but only after contacting the healthcare provider.

Choice C reason: Contacting the healthcare provider is the first action that the nurse should take. Sudden relief of pain in a child with appendicitis may indicate a perforation or rupture of the appendix, which is a life-threatening emergency. The nurse should immediately report this finding to the healthcare provider, who may order additional tests or expedite the surgery.

Choice D reason: Documenting the client's relief of pain is not the first action that the nurse should take. Documentation is an important part of nursing care, but it is not a priority in this situation. The nurse should document the child's pain level, vital signs, and interventions, but only after contacting the healthcare provider and taking appropriate actions.