A premature infant born at 30 weeks gestation is diagnosed with respiratory distress syndrome (RDS). The nurse is caring for the infant who is receiving surfactant replacement therapy and mechanical ventilation. Which nursing intervention is the highest priority for this infant?

Continuous monitoring of oxygen saturation and ABGs is the highest priority to assess treatment response and prevent complications like oxygen toxicity. Other interventions like suctioning, positioning, or adjusting ventilator settings are important but secondary to ongoing assessment.

Understanding Respiratory Distress Syndrome (RDS) and Surfactant Therapy
A premature infant born at 30 weeks gestation has lungs that are not yet ready to function independently. The core problem in Respiratory Distress Syndrome (RDS), also known as hyaline membrane disease, is a deficiency or dysfunction of pulmonary surfactant ^[2]. Surfactant is a lipoprotein complex, primarily composed of dipalmitoylphosphatidylcholine (DPPC), that lines the alveoli to reduce surface tension, prevent atelectasis, and protect the lungs ^[2]. Without adequate surfactant, the alveoli collapse during exhalation, leading to severe hypoxemia and respiratory acidosis.

Surfactant replacement therapy is a direct pharmacological intervention to address this deficiency. It is administered directly into the endotracheal tube to coat the inner surface of the alveoli, rapidly improving lung compliance and gas exchange. However, the period immediately following administration is critical. As the surfactant spreads and the lungs begin to open, the infant's respiratory mechanics and oxygenation status can change abruptly. The nurse's role is to continuously assess the infant's response to this therapy and the concurrent mechanical ventilation.

Priority Nursing Intervention: Continuous Monitoring
The highest priority intervention is to monitor oxygen saturation and arterial blood gas levels continuously. The rationale is grounded in the pathophysiology of RDS and the dynamic nature of surfactant therapy. After surfactant is administered, lung compliance often improves rapidly. If the mechanical ventilator settings are not adjusted in real-time to match this improvement, the infant is at high risk for a pneumothorax from excessive tidal volumes, or conversely, continued hypoxemia if the settings are insufficient. Continuous pulse oximetry provides immediate, non-invasive data on oxygenation trends, while arterial blood gases (ABGs) offer a definitive analysis of ventilation (PaCO2), oxygenation (PaO2), and acid-base balance. This allows the nurse to detect life-threatening changes like hypoxia, hypercapnia, or acidosis instantly and collaborate with the respiratory therapist or provider to fine-tune ventilator settings. A study examining nursing practices in a Saudi Arabian NICU found that less than half of the nurses (47.2%) demonstrated a strong understanding of RDS and surfactant therapy, highlighting a critical gap in recognizing diagnostic indicators and managing complications . This underscores why vigilant, knowledgeable monitoring is the cornerstone of safe care.

Analysis of Incorrect Options

Option 2: Suction the endotracheal tube every 2 hours to maintain patency.
This is a low-priority and potentially harmful action. Suctioning an endotracheal tube is performed only when clinically indicated by signs of secretion obstruction, such as visible secretions, coarse breath sounds, or a sawtooth pattern on the ventilator waveform. Routine, scheduled suctioning can cause unnecessary trauma to the delicate tracheal mucosa, induce hypoxia, cause atelectasis from the negative pressure, and increase intracranial pressure. Immediately after surfactant administration, suctioning is generally avoided for a period of time to prevent suctioning the medication out of the lungs before it has been fully absorbed and distributed.

Option 3: Position the infant in prone position to improve oxygenation.
While prone positioning can improve thoraco-abdominal synchrony and oxygenation in some preterm infants with RDS, it is not the highest priority intervention. Positioning is a supportive care measure. The immediate, overriding priority is the direct assessment of the infant's response to a critical medication and life-support technology through continuous physiological monitoring. Furthermore, prone positioning in an intubated infant requires extreme vigilance to ensure the airway is not compromised, making it a secondary consideration after stability is confirmed.

Option 4: Increase the ventilator settings to maximize oxygen delivery.
This action is outside the scope of nursing practice without a direct provider order and is based on a flawed clinical rationale. The goal is not to "maximize" oxygen delivery but to achieve adequate oxygenation and ventilation using the lowest possible settings to minimize ventilator-induced lung injury (barotrauma and volutrauma) and oxygen toxicity. After surfactant therapy, the lungs become more compliant, and the need for high pressures and high oxygen concentrations often decreases. A nurse who independently increases settings risks causing a pneumothorax or contributing to bronchopulmonary dysplasia (BPD). The nurse's role is to assess, recognize trends, and advocate for appropriate titration based on the monitored data .