Correct Answer: A

Rationale: The correct answer is A: 'It is a condition affecting the respiratory and digestive systems.' Cystic fibrosis is a genetic disorder that primarily affects the respiratory and digestive systems. It is caused by a defective gene that leads to the production of thick and sticky mucus in these organs. This mucus can clog airways in the lungs and block the ducts in the pancreas, affecting digestion. Choice B is incorrect because cystic fibrosis is not an autoimmune disorder; it is a genetic condition. Choice C is partially correct in that cystic fibrosis is a genetic disorder, but merely managing it with medication oversimplifies the comprehensive care needed for individuals with cystic fibrosis. Choice D is incorrect as cystic fibrosis is not caused by prenatal exposure to toxins but is a genetic condition inherited from parents.

Correct Answer: C

Rationale: In this scenario, the nurse should notify Child Protective Services for immediate intervention. The girl disclosed ongoing sexual abuse by her grandfather, which is a serious concern requiring immediate protection and intervention by the appropriate authorities. Child Protective Services are trained to handle cases of child abuse and neglect, ensuring the safety and well-being of the child. While notifying the police about a possible sex crime is crucial, Child Protective Services should be the first point of contact in cases of suspected child abuse due to their specialized role. Confirming the pregnancy through a healthcare provider is not the priority at this moment, as ensuring the safety of the child is paramount. Informing the girl's mother about the positive test result is not appropriate given the lack of belief in the abuse disclosure and the potential risk to the child's safety.

Correct Answer: B

Rationale: The correct answer is B: Assess for a patent airway. When dealing with a child who has sustained partial thickness burns, the priority is ensuring a patent airway due to the risk of respiratory compromise. Checking the child's skin color (choice A) may be important but is secondary to assessing the airway. While observing for symmetric breathing (choice C) is crucial, assessing the airway takes precedence in this situation. Palpating the child's pulse (choice D) is not the initial priority when managing burns and potential airway compromise.

Correct Answer: B

Rationale: Encouraging deep breathing exercises is important preoperative teaching for a child scheduled for a tonsillectomy. Deep breathing exercises can help the child relax and reduce anxiety, which is beneficial before the procedure. Explaining the procedure in detail might be overwhelming for a 4-year-old, whereas encouraging deep breathing exercises can be more beneficial in promoting relaxation and preparing the child. Discussing the importance of hydration is crucial for postoperative care but may not be the priority for preoperative teaching. Using play therapy can help prepare the child, but encouraging deep breathing exercises is more directly related to relaxation and preparation for the procedure.

Correct Answer: B

Rationale: Systolic blood pressure is the least reliable parameter when assessing the perfusion status of a 2-year-old child with possible shock. In pediatric patients, especially young children, blood pressure may not decrease until significant shock has already occurred, making it a late indicator of inadequate perfusion. Depending solely on systolic blood pressure to evaluate perfusion status in this age group can lead to a delay in appropriate interventions. Distal capillary refill time, skin color, and temperature changes, and the presence of peripheral pulses are more sensitive and early indicators of perfusion status in pediatric patients. Monitoring distal capillary refill provides information on peripheral perfusion, while changes in skin color and temperature can signal circulatory compromise. Evaluating the presence or absence of peripheral pulses offers insights into vascular perfusion. These parameters offer more reliable and prompt feedback on a child's perfusion status compared to systolic blood pressure.