What Researchers Did
Canadian emergency physicians at the University of Ottawa reported on two patients who accidentally swallowed concentrated hydrogen peroxide, developed gas bubbles in the portal vein (the main vein to the liver), and were both treated with HBOT.
What They Found
Both patients, one with significant symptoms and one with none, had portal venous gas confirmed by CT scan. After HBOT, follow-up CT scans in both cases showed complete resolution of the gas. One patient had serious symptoms while the other was asymptomatic, but both responded to HBOT. The authors suggest HBOT should be considered for all cases of concentrated hydrogen peroxide ingestion causing gas embolism, regardless of symptom severity.
Canadian Relevance
This is a Canadian study (University of Ottawa). Arterial and venous gas embolism are OHIP-covered indications for HBOT in Ontario, and this report directly supports that coverage for hydrogen peroxide poisoning cases.
Study Limitations
With only two cases, it is not possible to establish definitive treatment guidelines; the threshold for HBOT versus observation alone in asymptomatic patients with portal venous gas remains unclear.