# A 3-day-old infant diagnosed with meconium aspiration syndrome (MAS) is experiencing respiratory distress with grunting, nasal flaring, and cyanosis. The infant's oxygen saturation is 85% on room air. What is the priority nursing intervention?

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> subject: Maternal Newborn Health

## 문제

A 3-day-old infant diagnosed with meconium aspiration syndrome (MAS) is experiencing respiratory distress with grunting, nasal flaring, and cyanosis. The infant's oxygen saturation is 85% on room air. What is the priority nursing intervention?

## 보기

1. Perform chest physiotherapy and postural drainage
2. Administer surfactant replacement therapy
3. Provide supplemental oxygen and prepare for mechanical ventilation **✔ 정답**
4. Initiate immediate gastric lavage to remove swallowed meconium

**정답: 3**

## 해설

Supplemental oxygen and preparation for mechanical ventilation address hypoxemia and respiratory failure, the priority in MAS with distress and low SpO2. Other options are contraindicated (chest physiotherapy may worsen air trapping, surfactant is not standard, gastric lavage is ineffective).

## 심화 해설

Understanding the Clinical Scenario

A 3-day-old infant with meconium aspiration syndrome (MAS) presents with classic signs of severe respiratory distress: grunting, nasal flaring, and cyanosis. The oxygen saturation of 85% on room air indicates significant hypoxemia. MAS is a life-threatening respiratory disease resulting from the aspiration of meconium-stained amniotic fluid into the lungs, which can lead to airway obstruction, chemical pneumonitis, surfactant inactivation, and persistent pulmonary hypertension [1,2]. In this acute presentation, the priority is to correct the hypoxemia and support ventilation to prevent progression to respiratory failure and its sequelae, which include air leaks and persistent pulmonary hypertension [1].

Analysis of the Correct Answer (Option 3)

Provide supplemental oxygen and prepare for mechanical ventilation is the correct priority intervention. This action directly addresses the immediate life-threat: profound hypoxemia. The infant's saturation of 85% indicates an urgent need to increase the fraction of inspired oxygen (FiO2). Grunting is a physiological attempt to generate positive end-expiratory pressure (PEEP) and prevent alveolar collapse, while nasal flaring and cyanosis signal increased work of breathing and inadequate oxygenation. If supplemental oxygen fails to raise the saturation adequately, the infant is at high risk for respiratory failure, a well-documented complication of MAS [1]. Preparing for mechanical ventilation is therefore a critical, anticipatory nursing action. A systematic synthesis of evidence for managing neonatal respiratory conditions, including MAS, in low- and middle-income countries supports the centrality of respiratory support, including oxygen therapy and ventilation, as a cornerstone of management [3].

Why the Other Options Are Not the Priority

- Option 1: Perform chest physiotherapy and postural drainage. While airway clearance techniques may be considered in some MAS cases to help mobilize meconium, they are not the immediate priority in an acutely hypoxemic, unstable infant. The primary physiological derangement requiring immediate correction is the ventilation-perfusion mismatch and hypoxemia, not retained secretions. Performing physiotherapy on a severely distressed infant without first stabilizing oxygenation can worsen the clinical state.

- Option 2: Administer surfactant replacement therapy. Meconium inactivates endogenous surfactant, and surfactant replacement therapy is a recognized treatment for MAS. However, it is a pharmacological intervention that requires a provider's order and is not the first-line, independent nursing action for acute desaturation. The immediate nursing priority is to apply the ABC (Airway, Breathing, Circulation) framework by administering oxygen and preparing for escalating respiratory support. Surfactant administration would follow initial stabilization.

- Option 4: Initiate immediate gastric lavage to remove swallowed meconium. Gastric lavage is not a recommended intervention for MAS. The pathophysiology of MAS involves aspiration of meconium into the trachea and lungs, not the stomach. While spectral analysis of gastric aspirates is being studied as a predictive tool for respiratory support needs, this relates to assessing surfactant components, not removing meconium as a treatment . Lavaging the stomach does nothing to clear the airways or improve oxygenation and delays critical, life-saving respiratory interventions.

Clinical Reasoning and Pathophysiology Connection

The nurse must recognize that the combination of grunting, nasal flaring, cyanosis, and an SpO2 of 85% signals impending respiratory failure. In MAS, aspirated meconium causes a ball-valve effect leading to air trapping, chemical pneumonitis, and surfactant dysfunction, all of which culminate in severe hypoxemia [1]. The immediate nursing action is to apply oxygen to reverse hypoxemia and to prepare for definitive airway management with mechanical ventilation, which can deliver the necessary PEEP and oxygenation pressures to overcome the lung pathology. This aligns with the ABC priority-setting framework fundamental to NCLEX-RN and clinical practice.References (research sources)

- [1]Meconium aspiration syndrome and associated factors among neonates admitted at neonatal intensive care unit at Northwest Ethiopia comprehensive specialized hospitals Northwest Ethiopia 2023.Research articleAdugna M, Asmare K, Wondim A. (2025) · DOI: 10.1186/s12887-024-05181-4

- [3]The Care of Preterm and Term Newborns with Respiratory Conditions: A Systematic Synthesis of Evidence from Low- and Middle-Income Countries.Research articleDominguez G, Muralidharan O, Lee Him R, Harrison L, Vaivada T, Bhutta ZA. (2025) · DOI: 10.1159/000542482

## 임상 시나리오

Clinical Management of Severe Meconium Aspiration Syndrome

A 3-day-old infant with MAS presenting with grunting, nasal flaring, cyanosis, and an oxygen saturation of 85% on room air is in acute hypoxemic respiratory failure. The immediate priority is to reverse hypoxemia and support ventilation.

Immediate Actions

- **Oxygen Administration:** Provide supplemental oxygen via a non-rebreather mask or nasal cannula to target SpO2 of 90-95%. Titrate FiO2 based on continuous pulse oximetry.

- **Respiratory Support Preparation:** If the infant remains hypoxemic despite high FiO2 or exhibits worsening work of breathing, prepare for non-invasive ventilation (e.g., CPAP) or endotracheal intubation and mechanical ventilation.

- **Monitoring:** Continuously monitor heart rate, respiratory rate, blood pressure, and oxygen saturation. Assess for signs of impending respiratory failure, such as fatigue, apnea, or bradycardia.

Subsequent Interventions

- **Surfactant Therapy:** Consider surfactant administration if ventilatory support is required, as meconium inactivates endogenous surfactant.

- **Supportive Care:** Maintain a neutral thermal environment, minimize handling, and provide nutritional support (IV fluids) to reduce oxygen consumption.

- **Complication Surveillance:** Monitor for air leaks (pneumothorax) and persistent pulmonary hypertension (PPHN), which may require inhaled nitric oxide.

**Rationale:** Chest physiotherapy is contraindicated in the acute unstable phase. Gastric lavage is not indicated for MAS. Surfactant is a secondary therapy after stabilization.

## 핵심 개념

- **Meconium Aspiration Syndrome (MAS)** — Respiratory distress in a newborn caused by aspiration of meconium-stained amniotic fluid, leading to airway obstruction, inflammation, and surfactant inactivation.
- **Grunting** — A sound made during expiration by a newborn in respiratory distress, indicating an attempt to generate positive end-expiratory pressure (PEEP) to keep alveoli open.
- **Hypoxemia** — Abnormally low level of oxygen in the blood, indicated by low oxygen saturation (e.g., 85%).
- **Persistent Pulmonary Hypertension of the Newborn (PPHN)** — A serious complication of MAS where pulmonary vascular resistance remains high, causing right-to-left shunting and severe hypoxemia.

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