What Researchers Did
Researchers documented the cases of two workers who were accidentally exposed to propionitrile fumes, leading to cyanide poisoning.
What They Found
One worker, who was comatose with a blood cyanide level of 5.0 micrograms/ml, regained consciousness after receiving sodium nitrite/sodium thiosulfate and then had continued symptoms treated with hyperbaric oxygen at 2 atmospheres for a total of 4 hours. A second worker, with milder symptoms and a blood cyanide level of 3.5 micrograms/ml, was treated with only sodium nitrite/sodium thiosulfate. The ambient propionitrile concentration at the site was 77.5 mg/m3.
What This Means for Canadian Patients
For Canadian patients experiencing acute cyanide poisoning from propionitrile or similar chemicals, this study suggests that hyperbaric oxygen therapy could be a valuable additional treatment alongside standard cyanide antidotes, especially if symptoms persist. This approach may help manage the ongoing generation of cyanide in the body.
Canadian Relevance
No direct Canadian connection identified.
Study Limitations
As a case report involving only two patients, this study cannot definitively prove the general effectiveness of hyperbaric oxygen for propionitrile poisoning.