Correct Answer: D

Rationale: During the school-age period, children are active, curious, and engaged in various physical activities, making them more susceptible to accidents and injuries. This developmental stage is characterized by increased motor skills and exploration, leading to a higher risk of unintentional harm. While infections, poisonings, and risk-taking behaviors are also concerns for school-age children, focusing on preventing and addressing accidents and injuries is essential due to their heightened physical activity and curiosity.

Correct Answer: B

Rationale: When an infant experiences intractable vomiting, it can lead to the loss of stomach acids, resulting in metabolic alkalosis. Alkalosis is characterized by elevated blood pH and can lead to serious complications. Assessing for alkalosis is essential in this scenario to monitor and manage the infant's condition. Choices A, C, and D are incorrect because in this context, the primary concern is the metabolic imbalance caused by excessive vomiting, leading to alkalosis rather than acidosis, hyperkalemia, or hypernatremia.

Correct Answer: B

Rationale: The most important nursing intervention for a child with bronchiolitis is providing respiratory therapy. This intervention helps to maintain airway patency and improve breathing by assisting with mucus clearance and ventilation. Administering bronchodilators (Choice A) may be considered in some cases, but it is not the most crucial intervention for bronchiolitis. Monitoring oxygen saturation (Choice C) is important but is not as directly impactful as providing respiratory therapy. Encouraging fluid intake (Choice D) is important for hydration but does not directly address the respiratory distress associated with bronchiolitis.

Correct Answer: C

Rationale: The correct priority intervention for a child with acute laryngotracheobronchitis is to place a tracheotomy set at the bedside. Acute laryngotracheobronchitis can lead to airway obstruction, making it essential to have the equipment readily available in case of emergency. Padding the side rails, arranging for a quiet room, or obtaining a recliner for a parent are not the immediate priorities in managing a child with this condition.

Correct Answer: B

Rationale: The primary purpose of a lumbar puncture is to obtain a sample of cerebrospinal fluid for analysis. This sample helps in diagnosing conditions such as meningitis by evaluating the presence of pathogens or abnormalities in the cerebrospinal fluid. Measuring the pressure of cerebrospinal fluid (Choice A) is not the main objective of a lumbar puncture, although it can be done during the procedure. Relieving intracranial pressure (Choice C) is not the direct purpose of a lumbar puncture, as other interventions are typically used for this purpose. Assessing the presence of infection in the spinal fluid (Choice D) is related to the overall goal of obtaining a sample for analysis, making it a secondary outcome of the procedure.