What Researchers Did
Brazilian researchers analyzed 199 COPD patients on long-term home oxygen therapy over five years to see whether the number of hours per day of prescribed oxygen correlated with survival.
What They Found
Of 254 patients enrolled, 124 died over five years (62.3%). No statistically significant difference in mortality was found between the 12, 15, or 24 hours/day oxygen groups. The only significant independent predictor of mortality was a higher depression score; patients prescribed 24 hours/day had a much higher mortality risk compared to those on 12 hours/day, likely reflecting disease severity rather than a causal oxygen effect.
Canadian Relevance
No direct Canadian connection identified. Note: HBOT MeSH tagging appears incidental; this study concerns home oxygen therapy, not hyperbaric oxygen.
Study Limitations
Retrospective single-centre design, reliance on patient-reported adherence, and inability to control for disease severity confounding limit the reliability of these findings.