Toxicology – Caustic Ingestion: Alkaline Agents

Sources

Common alkaline caustic products include:

• Drain cleaners
• Lye
• Oven cleaners
• Ammonia-containing cleaners
• Some concentrated cleaning solutions
• Bleach, although household bleach is usually less corrosive than strong alkalis

Typical Presentation

A young child is found after getting into a household cleaner and develops:

• Coughing
• Sore throat
• Drooling
• Pain with swallowing

Severity depends on the concentration, amount, and duration of contact.

Clinical Features

Possible findings include:

• Oral or pharyngeal burns
• Drooling
• Nausea and vomiting
• Hematemesis
• Dysphagia
• Odynophagia
• Chest pain
• Abdominal pain
• Dyspnea or stridor

Serious complications include:

• Upper-airway edema
• Esophageal or gastric injury
• Perforation
• Mediastinitis or peritonitis
• Later esophageal stricture formation

Importantly, the absence of visible mouth burns does not exclude serious esophageal injury.

Mechanism of Action

Alkaline substances cause liquefactive necrosis and saponification of fats.

This allows deeper tissue penetration and can produce significant injury to the esophagus and surrounding structures.

Management

Initial priorities include:

• Airway assessment and protection
• Supportive care
• Evaluation for perforation or significant internal injury
• Early consultation with gastroenterology, surgery, and toxicology when severe exposure is suspected

Endoscopy is commonly used in selected symptomatic patients to assess the extent of injury, usually after stabilization and within an appropriate early time window.

Avoid:

• Inducing vomiting
• Gastric lavage
• Activated charcoal
• Attempting to neutralize the alkali with an acid

These measures can worsen tissue injury or increase aspiration risk.

Routine administration of milk or water after significant caustic ingestion is not generally recommended without poison-center or specialist guidance, especially once symptoms are present.

Key Points

• Alkalis cause liquefactive necrosis and can penetrate deeply.
• Drooling, dysphagia, odynophagia, chest pain, or respiratory symptoms suggest significant injury.
• A normal-looking mouth does not rule out esophageal burns.
• Do not induce emesis or attempt chemical neutralization.
• Airway compromise and GI perforation are the most dangerous early complications.
• Corticosteroids are not routinely recommended solely to prevent strictures; their use depends on the specific clinical situation.