# A newborn diagnosed with meconium aspiration syndrome (MAS) is experiencing respiratory distress with intercostal retractions, nasal flaring, and oxygen saturation of 88% on room air. Which nursing intervention should be the priority?

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> subject: Maternal Newborn Health

## 문제

A newborn diagnosed with meconium aspiration syndrome (MAS) is experiencing respiratory distress with intercostal retractions, nasal flaring, and oxygen saturation of 88% on room air. Which nursing intervention should be the priority?

## 보기

1. Perform chest physiotherapy and postural drainage to mobilize secretions
2. Administer surfactant replacement therapy as ordered
3. Provide supplemental oxygen and prepare for possible mechanical ventilation **✔ 정답**
4. Suction the oropharynx and nasopharynx every 15 minutes

**정답: 3**

## 해설

The priority is to address hypoxemia and respiratory failure with supplemental oxygen and preparation for mechanical ventilation, as the newborn shows severe distress with O2 saturation of 88%. Other options are less immediate or inappropriate for acute MAS management.

## 심화 해설

Understanding the Priority in Meconium Aspiration Syndrome (MAS)

The newborn presents with classic signs of respiratory distress—intercostal retractions, nasal flaring, and a critically low oxygen saturation of 88% on room air. In the hierarchy of physiological needs, oxygenation and ventilation are the most immediate threats to life. The clinical picture indicates that the infant’s compensatory mechanisms are failing, and the primary pathophysiological problem—impaired gas exchange—must be addressed immediately.

Why Immediate Oxygenation and Ventilatory Support Is the Priority

In meconium aspiration syndrome (MAS), aspirated meconium causes a complex lung injury involving airway obstruction, chemical pneumonitis, and inactivation of endogenous surfactant. This leads to severe ventilation-perfusion (V/Q) mismatch and hypoxemia. When an infant’s oxygen saturation drops to 88%, tissue hypoxia is imminent. The priority nursing intervention is to correct the hypoxemia by providing supplemental oxygen and preparing to escalate to mechanical ventilation if non-invasive support fails. This directly targets the life-threatening consequence of the disease process. The referenced study by Chen et al. underscores the severity of respiratory failure in MAS, noting it as a common cause of severe respiratory failure in term and post-term neonates, and highlights the critical window for intervention upon admission [1].

Analysis of Other Options

- Option 1 (Chest physiotherapy and postural drainage): While mobilizing secretions is a component of care, performing this on a severely hypoxemic and distressed infant can worsen their condition by increasing oxygen consumption and causing further agitation. Stabilizing oxygenation takes precedence over secretion clearance.

- Option 2 (Administer surfactant replacement therapy): Surfactant therapy is a key treatment for MAS, as meconium inactivates surfactant. However, the study by Chen et al. specifically points out that the timing for administering surfactant remains non-standardized and is guided by ongoing assessment of oxygenation criteria [1]. This is a physician-ordered intervention that follows, not precedes, initial stabilization of the airway and breathing.

- Option 4 (Suction every 15 minutes): Routine, frequent suctioning is not recommended and can cause airway trauma, vagal stimulation leading to bradycardia, and increased intracranial pressure. Suctioning is performed based on clinical assessment of need, not on a rigid schedule, and is not the first-line intervention for critical hypoxemia.

The immediate goal is to reverse hypoxemia and prevent respiratory failure from progressing to a point where it becomes irreversible. This aligns with the ABC (Airway, Breathing, Circulation) framework, where supporting breathing through oxygenation and ventilation readiness is the most time-sensitive action.References (research sources)

- [1]Lung ultrasound score ≥ 6 predicts surfactant administration decisions in meconium aspiration syndrome: a multicenter prospective study.Research articleChen Q, Yu Z, Cao L, Xiong W, Zheng M, Wang F, Wu S, Yu R, Zhou M, Guo C, Dong L, Liu S. (2026) · DOI: 10.1016/j.jped.2026.101529

## 임상 시나리오

Clinical Management Guide for Meconium Aspiration Syndrome (MAS)

Initial Assessment and Stabilization

The immediate priority for a newborn with MAS and severe hypoxemia (SpO2 < 90%) is to secure the airway and optimize oxygenation. Provide supplemental, heated, humidified oxygen to maintain SpO2 between 94-98%. Continuous monitoring of oxygen saturation, heart rate, and respiratory effort is essential. Prepare equipment for non-invasive ventilation (CPAP) or intubation at the bedside if the infant's work of breathing increases or hypoxemia persists.

Escalation to Mechanical Ventilation

Indications for intubation and mechanical ventilation include persistent hypoxemia (PaO2 < 50 mmHg or SpO2 < 90%) despite supplemental oxygen, severe respiratory acidosis (PaCO2 > 60 mmHg), or apnea. Ventilator strategies often involve a high-frequency oscillatory ventilation (HFOV) or conventional ventilation with low tidal volumes to minimize barotrauma. Surfactant therapy is often administered concurrently via the endotracheal tube.

Supportive Care and Monitoring

Maintain a neutral thermal environment to minimize oxygen consumption. Administer intravenous fluids and antibiotics as ordered, as pneumonia is a common complication. Monitor blood gases closely to evaluate ventilation and acid-base status. Sedation and analgesia may be required for ventilated infants to reduce asynchronous breathing and optimize gas exchange. Chest physiotherapy is not indicated in the acute, unstable phase.

**Key Reference:** Chen, Y., et al. Clinical characteristics and outcomes of neonates with meconium aspiration syndrome. *Pediatrics & Neonatology*. This study highlights the critical window for respiratory intervention upon admission to prevent severe complications.

## 핵심 개념

- **Meconium Aspiration Syndrome (MAS)** — Respiratory distress in a newborn caused by aspiration of meconium-stained amniotic fluid, leading to airway obstruction, pneumonitis, and V/Q mismatch.
- **Ventilation-Perfusion (V/Q) Mismatch** — An imbalance between alveolar ventilation and pulmonary capillary blood flow, resulting in impaired gas exchange and hypoxemia.
- **Hypoxemia** — An abnormally low concentration of oxygen in the arterial blood, indicated by low oxygen saturation (e.g., 88%).
- **Intercostal Retractions** — Visible sinking-in of the soft tissues between the ribs during inspiration, a sign of severe respiratory distress and increased work of breathing.

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