A 4-year-old child with a history of cystic fibrosis (CF) presents to the clinic for a routine follow-up. The parents report that the child has had an increase in productive cough, wheezing, and shortness of breath over the past few days. Upon examination, the child has clubbed fingers, and chest auscultation reveals decreased breath sounds. Given these findings, which of the following interventions should the nurse prioritize to manage the child's condition and prevent further respiratory complications?

A. Increasing the child’s intake of high-fat foods is incorrect as the primary concern in this scenario is acute respiratory compromise, not malnutrition. While high-calorie, high-fat diets are important for CF management to address nutritional deficits, this intervention does not immediately improve airway clearance or reduce respiratory symptoms. B. Encouraging increased fluid intake is partially correct because hydration helps thin mucus, making it easier to clear. However, hydration alone is insufficient for managing acute airway obstruction, especially when the child has decreased breath sounds and increased respiratory secretions. C. Administering inhaled corticosteroids is incorrect as these reduce airway inflammation over time but are not the first-line intervention for acute mucus obstruction or compromised ventilation. They are adjunctive therapy rather than the priority in acute management. D. Initiating chest physiotherapy (CPT) is correct because CF causes thick, sticky mucus that obstructs the airways, leading to infection and decreased oxygenation. CPT, including percussion, vibration, and postural drainage, helps mobilize mucus, improve ventilation, prevent atelectasis, and reduce the risk of further respiratory complications. This is considered the priority nursing intervention for acute respiratory exacerbations in CF.