A nurse is caring for a child who has cystic fibrosis and requires postural drainage. Which of the following actions should the nurse take?

Choice A reason: Performing postural drainage immediately after meals risks aspiration and discomfort due to gastric contents shifting during positioning. It should be done 1-2 hours after meals to ensure safety and efficacy in clearing mucus from the lungs, making this timing inappropriate for cystic fibrosis management. Choice B reason: Performing postural drainage twice daily is recommended for cystic fibrosis to mobilize thick mucus from the lungs, improving airway clearance and reducing infection risk. This frequency balances effectiveness with patient tolerance, aligning with evidence-based guidelines for managing chronic respiratory conditions, making it the correct action. Choice C reason: Using a percussion vest is an alternative to manual postural drainage but is not specified as the only method. Manual techniques are effective and standard unless a vest is prescribed. This choice assumes equipment availability, which may not apply, making it less universally appropriate than scheduled manual drainage. Choice D reason: Positioning the child flat during postural drainage is incorrect, as specific angled positions (e.g., head-down) are needed to target lung segments and promote mucus drainage by gravity. Flat positioning reduces effectiveness and may not clear airways adequately, making this an inappropriate technique for cystic fibrosis.