What Researchers Did
Researchers measured cerebral blood flow, cerebral metabolism, and cerebrospinal fluid parameters in comatose head-injured patients before and after hyperbaric oxygen treatment.
What They Found
Before hyperbaric oxygen, patients showed higher than normal arterial blood and CSF lactate, and lower cerebral blood flow, cerebral metabolic rates of oxygen, and CSF oxygen pressure. After treatment, cerebral blood flow changes were inconsistent, increasing in some patients and decreasing in others, and cerebral metabolic rate changes were also inconsistent. CSF oxygen pressure, acid-base balance, and lactate content did not vary, while arterial oxygen pressure consistently fell.
What This Means for Canadian Patients
This study suggests that hyperbaric oxygen treatment for comatose head-injured patients may have variable effects on cerebral blood flow and metabolism. Due to inconsistent findings, its direct practical application for improving outcomes in Canadian patients with severe head injuries remains unclear and requires further research.
Canadian Relevance
This study has no direct Canadian connection as it was conducted in Europe and did not involve Canadian researchers or patients.
Study Limitations
The study's main limitation is the inconsistent and variable responses observed among patients, making it difficult to draw definitive conclusions about the effects of hyperbaric oxygen.