Treatment of Inhalation Injuries with Suspected Carbon Monoxide and Cyanide Toxicity

Initial Management

The American Heart Association recommends immediate administration of 100% oxygen via non-rebreather mask or endotracheal tube to all patients with suspected inhalation injury, as this accelerates the elimination of carboxyhemoglobin, reducing its half-life from approximately 320 minutes on room air to about 74 minutes 3
Secure airway, provide ventilatory support, and ensure circulatory stability as part of basic and advanced life support measures, as recommended by the American Heart Association 4, 1
Obtain blood samples to measure carboxyhemoglobin levels, arterial blood gases, lactate levels, and complete blood count, as suggested by clinical guidelines 3

Administer hydroxocobalamin (Cyanokit) as the first-line antidote for suspected cyanide poisoning in smoke inhalation victims, with an adult dose of 5 g IV (10 g for cardiac arrest) and a pediatric dose of 70 mg/kg (maximum 5 g), as recommended by the American Heart Association 2, 6, 5
Consider sodium thiosulfate (12.5 g IV for adults, 250 mg/kg for children) following hydroxocobalamin to enhance cyanide elimination, as suggested by clinical guidelines 2

Continue administration of 100% oxygen until carboxyhemoglobin levels normalize, as recommended by clinical guidelines 3
Consider hyperbaric oxygen therapy (HBOT) for patients with loss of consciousness, neurological deficits, significant metabolic acidosis, or COHb levels >25%, as suggested by the American Heart Association 1, 3, 5, 6

Continuously monitor vital signs, oxygen saturation, cardiac rhythm, and mental status, as recommended by the American Heart Association 4
Provide fluid resuscitation as needed, especially in patients with associated burns, as suggested by clinical guidelines 5

For pregnant patients, hyperbaric oxygen therapy is strongly recommended regardless of carboxyhemoglobin levels due to fetal vulnerability to carbon monoxide, as suggested by clinical guidelines 3
In patients with both thermal burns and inhalation injury, prioritize airway management and treatment of systemic toxicity before addressing burn wounds, as recommended by clinical guidelines 5

All patients should receive clinical follow-up 1-2 months after exposure to assess for delayed neurological sequelae, as suggested by clinical guidelines 3
Patients with persistent neurological symptoms should be referred for formal neuropsychological evaluation, as recommended by clinical guidelines 3