A 4-year-old child is brought to the emergency department after being found submerged in a backyard pool for approximately 3-5 minutes. The child was successfully resuscitated at the scene and is now conscious but lethargic. Vital signs are: temperature 96.8°F (36°C), heart rate 110 bpm, respiratory rate 28/min, blood pressure 90/60 mmHg, oxygen saturation 94% on room air. What is the priority nursing intervention for this child?

Following submersion injury, respiratory compromise is the most immediate life-threatening concern. The child's oxygen saturation of 94% indicates hypoxemia, and tachypnea suggests respiratory distress, making supplemental oxygen and preparation for intubation the priority intervention.

Clinical Context and Priority Setting

This scenario describes a 4-year-old child who experienced a submersion injury, leading to a hypoxic event. The child is now conscious but lethargic with a low body temperature and mild hypoxemia. In pediatric cardiac arrest, the primary etiology is overwhelmingly asphyxial, not a primary cardiac event, which fundamentally shifts the priority toward immediate respiratory support ^[1]. The child’s oxygen saturation of 94% on room air indicates inadequate oxygenation, and the lethargic mental status is a critical sign of potential ongoing cerebral hypoxia. Therefore, the immediate priority is to correct hypoxemia to prevent progression to cardiac arrest.

Analysis of the Correct Answer (Option 4)

Providing supplemental oxygen and preparing for potential intubation directly targets the underlying pathophysiology of asphyxial injury. The child’s respiratory drive or airway protective reflexes may be compromised due to the neurological impact of the submersion. Early and effective airway management, including the delivery of high-concentration oxygen, is the cornerstone of post-resuscitation care to minimize secondary brain injury from hypoxemia ^[1]. The preparation for intubation is a prudent step, as a lethargic child with a submersion injury is at high risk for respiratory deterioration and loss of airway patency.

Why the Other Options Are Not the Priority

- Option 1: While the child is hypothermic (96.8°F / 36°C), rewarming is an important but secondary intervention. In the hierarchy of resuscitation, oxygenation and ventilation take precedence over temperature management. Initiating active rewarming before securing the airway and correcting hypoxia does not address the most immediate life-threatening problem ^[1].
- Option 2: An arterial blood gas (ABG) analysis would provide valuable information about ventilation and acid-base status. However, it is a diagnostic procedure, not a therapeutic one. The clinical signs of lethargy and an oxygen saturation of 94% already provide sufficient indication to initiate oxygen therapy without delay. Postponing oxygen delivery to wait for ABG results would be a critical error in a patient with a suspected asphyxial injury ^[1].
- Option 3: Inserting a nasogastric tube is indicated in submersion injuries to decompress the stomach, as gastric distention from swallowed water and positive-pressure ventilation can elevate the diaphragm and impair breathing. However, this is a supportive measure that should be performed only after the immediate respiratory needs are addressed and the airway is secured. It is not the first action for a lethargic, hypoxemic child ^[1].

Pathophysiological Rationale and Clinical Application

The sequence of events in a submersion injury begins with breath-holding, followed by laryngospasm and eventual aspiration of water, all leading to profound hypoxemia. The resulting hypoxic-ischemic encephalopathy is the primary determinant of outcome. The pediatric resuscitation guidelines emphasize that prevention and early intervention for respiratory failure are key, as a pediatric cardiac arrest is rarely a sudden event but rather the terminal result of progressive respiratory insufficiency or shock ^[1]. The concept of Pediatric Early Warning Systems (PEWS) in hospitals is built on this very principle—to detect and treat deterioration in the respiratory and circulatory systems before a cardiac arrest occurs ^[1]. In this emergency department presentation, the nurse must apply the same principle by immediately intervening when signs of respiratory compromise (lethargy, SpO2 94%) are present. The administration of supplemental oxygen is the single most effective immediate action to interrupt the progression from hypoxic respiratory failure to cardiac arrest ^[1].