What Researchers Did
Researchers checked whether a simple, non-invasive finger sensor reading called the perfusion index could help doctors decide which carbon monoxide poisoning patients need hyperbaric oxygen therapy.
What They Found
This prospective observational study of adult carbon monoxide poisoning patients found that a lower perfusion index at diagnosis was associated with a higher likelihood of needing hyperbaric oxygen therapy, with an AUC of 0.935 for predicting that need. The perfusion index at diagnosis showed a significant, moderate negative correlation with carboxyhemoglobin levels at diagnosis across all patients. Patients who went on to receive hyperbaric oxygen therapy had significantly lower perfusion index and significantly higher carboxyhemoglobin, lactate, and pleth variability index readings at diagnosis than patients who received normobaric oxygen therapy. After 60 minutes of treatment, perfusion index increased while pleth variability index, lactate, and carboxyhemoglobin all decreased significantly in both treatment groups (p less than 0.001 for all).
What This Means for Canadian Patients
For Canadian carbon monoxide poisoning patients, this suggests perfusion index readings, especially, may reflect changes in carboxyhemoglobin levels and could provide additional information to support triage and monitoring alongside standard testing. The abstract does not describe perfusion index replacing carboxyhemoglobin measurement or clinical judgment in deciding on hyperbaric oxygen therapy.
Canadian Relevance
No direct Canadian connection identified.
Study Limitations
The study was observational with non-randomized assignment to hyperbaric versus normobaric oxygen therapy, so the perfusion index associations reported cannot be taken as proof that it independently improves triage decisions.