A 3-year-old child is brought to the emergency department after ingesting an unknown amount of toilet bowl cleaner containing hydrochloric acid 30 minutes ago. The child is alert but drooling and complaining of mouth pain. What is the priority nursing action?

Airway management is the priority when a child has ingested a caustic substance like hydrochloric acid, as swelling and edema of the throat and airway can develop rapidly.

When a 3-year-old child has ingested a toilet cleaner containing hydrochloric acid, the priority nursing intervention is airway maintenance and assessment of respiratory distress. Caustic substances like hydrochloric acid cause immediate chemical burns to the mucosa of the mouth, throat, esophagus, and stomach.

Pathophysiologically, acidic substances cause direct tissue damage, leading to inflammation, edema, and potentially tissue necrosis. The throat and upper airway are particularly vulnerable, and edema can progress rapidly, causing airway obstruction. Signs of airway injury include stridor, difficulty swallowing, drooling (observed in this case), hoarseness, and respiratory distress.

From a nursing perspective, airway assessment and management take precedence over all other interventions according to the ABC (Airway, Breathing, Circulation) priority framework. The nurse should continuously monitor for signs of airway edema and prepare for emergency endotracheal intubation if necessary. Oxygen saturation monitoring and positioning the child upright help maintain airway patency.

The correct answer, option 4, addresses the most life-threatening complication: airway obstruction. This follows established emergency protocols for managing caustic substance ingestion, where airway protection is the immediate priority before addressing other concerns such as gastrointestinal damage or pain management. Inducing vomiting, administering milk, and gastric lavage are all contraindicated, as they can increase the risk of further tissue damage or aspiration.

Understanding the Emergency: Caustic Ingestion in a Toddler

When a toddler ingests a corrosive substance like a toilet bowl cleaner containing hydrochloric acid, the immediate tissue damage begins on contact. The child's symptoms of drooling and mouth pain are critical clues indicating injury to the oropharynx and esophagus. The pathophysiology involves liquefactive necrosis from strong acids, which can rapidly penetrate tissues, leading to edema, inflammation, and potential airway compromise. The priority is not the gastrointestinal tract but the airway, as edema in the pharynx and larynx can progress swiftly to obstruction .

Analyzing the Options: Why Airway is the Priority

The core of safe emergency nursing care for a caustic ingestion is to avoid any intervention that could cause re-exposure of the damaged tissue to the corrosive agent. Let's evaluate the proposed actions:

1. Induce vomiting immediately to remove the caustic substance: This is contraindicated. Vomiting brings the acid back up through the already burned esophagus and oropharynx, causing re-injury, deepening the burns, and significantly increasing the risk of aspiration and perforation .
2. Give the child milk to neutralize the acid: Attempting neutralization can trigger an exothermic reaction, generating heat and causing additional thermal burns on top of the chemical injury. Dilution with milk or water is also not recommended in large volumes as it may induce vomiting, carrying the same risks .
3. Perform gastric lavage to remove remaining poison: Blind insertion of a nasogastric tube in a patient with a burned, friable esophagus carries a high risk of perforation. Furthermore, lavage can push the caustic agent into the duodenum or cause it to reflux, worsening the injury. This procedure is generally avoided in acute caustic ingestion .
4. Maintain the child's airway and assess for respiratory distress: This is the correct and immediate priority. Airway edema from the corrosive burn can lead to stridor, respiratory distress, and complete obstruction. A patent airway must be secured before any other diagnostic or therapeutic steps are taken .

Clinical Reasoning and Long-Term Implications

The immediate focus on the airway aligns with the primary survey of emergency care. Following stabilization, the long-term management of caustic ingestion is complex and has evolved over decades, as highlighted by the lack of a universally accepted treatment algorithm . The primary concern after the acute phase is the development of esophageal strictures. The injury triggers an intense inflammatory response, and as healing occurs, collagen deposition can lead to luminal narrowing .

To prevent this, some centers have explored early interventions like esophageal stenting. A retrospective study described using a chest tube as an esophageal stent (ECT) in pediatric patients to maintain luminal patency during the healing phase, aiming to reduce stricture formation . This highlights that while the nurse's immediate role is airway protection and preventing further harm, the patient is entering a care pathway that requires long-term surveillance for complications such as strictures, fistulas, and nutritional deficits . The diagnostic approach, often involving early endoscopy, is critical for grading the injury and guiding subsequent therapy, which may include stenting, serial dilations, or, in severe cases, surgical reconstruction [2, 3].