A nurse is caring for a preterm infant diagnosed with respiratory distress syndrome (RDS). Which nursing intervention should be the priority to optimize respiratory function?

Prone positioning is the priority for RDS as it improves oxygenation and lung mechanics. Other options are less optimal: suctioning can cause trauma, increasing oxygen may lead to toxicity, and chest physiotherapy is contraindicated in preterm infants.

Understanding Respiratory Distress Syndrome (RDS) in Preterm Infants
The priority for a preterm infant with RDS is to optimize ventilation and oxygenation while minimizing energy expenditure and the risk of further lung injury. RDS results from a deficiency of surfactant, a lipoprotein that reduces surface tension within the alveoli. Without adequate surfactant, the alveoli collapse during exhalation (atelectasis), leading to impaired gas exchange, hypoxemia, and increased work of breathing. The structural immaturity of the preterm chest wall, which is highly compliant, further compromises the infant's ability to maintain functional residual capacity (FRC). Nursing interventions must be grounded in supporting the infant's fragile physiology.

Analysis of the Priority Intervention: Prone Positioning
Placing the infant in the prone position is the priority intervention because it directly supports the pathophysiological challenges of RDS. This position offers several mechanical and physiological advantages for a preterm infant with a compliant chest wall and surfactant deficiency.

First, the prone position stabilizes the compliant chest wall, reducing paradoxical chest movement and making breathing more efficient. This stabilization helps the infant maintain a higher functional residual capacity (FRC), which is the volume of air remaining in the lungs at the end of a normal expiration. Maintaining FRC is critical to preventing alveolar collapse. A recent randomized crossover trial demonstrated a significant clinical benefit of this intervention, finding that prone positioning in preterm infants was associated with a reduction in hypoxemic events . By improving oxygenation stability, the prone position directly addresses the primary problem of RDS.

Second, this position improves thoracoabdominal synchrony and can enhance feeding tolerance, a finding also supported by the same trial, which noted a reduction in gastric residuals in the prone position . This is important because poor feeding tolerance can lead to abdominal distension, which elevates the diaphragm and further compromises lung expansion. A minimal-handling protocol that includes prone positioning during critical events like extubation has also been shown to help prevent volume loss in the lungs, underscoring its role in preserving lung volume .

Why Other Options Are Not the Priority
- Option 2: Suction the airway every 2 hours. Routine, scheduled suctioning is not recommended and can be harmful. The airways of a preterm infant are narrow, have fragile mucosa, and are reactive. Unnecessary suctioning can cause trauma, edema, vagal stimulation leading to bradycardia, and hypoxemia. Suctioning should be performed only when clinically indicated by assessment findings such as audible secretions, increased work of breathing, or a drop in oxygen saturation, not on a fixed schedule.
- Option 3: Increase the oxygen concentration to maintain oxygen saturation above 95%. This intervention is incorrect and dangerous. Preterm infants are highly susceptible to retinopathy of prematurity (ROP) and other oxidative stress injuries. Target oxygen saturation ranges for preterm infants receiving supplemental oxygen are strictly controlled, typically between 90% and 95%, with specific alarm limits to prevent both hypoxemia and hyperoxemia. Blindly increasing oxygen to keep saturation above 95% risks severe hyperoxic injury. The nurse must titrate oxygen based on a prescribed target range, not an arbitrary upper limit.
- Option 4: Perform chest physiotherapy every 4 hours. While respiratory physiotherapy is a recognized non-pharmacological intervention for preterm neonates with chronic conditions like bronchopulmonary dysplasia (BPD), its role in the acute phase of RDS is not a first-line priority and lacks strong evidence for routine prophylactic use . In the acute stage of RDS, the lungs are stiff and atelectatic, not filled with excess secretions. Aggressive chest physiotherapy can increase energy expenditure, cause rib fractures in fragile bones, and destabilize an infant who is already struggling to maintain oxygenation. Positioning to optimize ventilation-perfusion matching and lung volume is the foundational, less invasive, and evidence-supported priority.

The evidence clearly points to prone positioning as a simple, effective, and non-invasive strategy that directly counteracts the physiological instability caused by RDS, making it the nurse's immediate priority before considering other more invasive or potentially harmful interventions [2, 4].