What Researchers Did
Researchers instrumented 10 healthy volunteers with arterial and pulmonary arterial catheters to measure hemodynamic and blood gas parameters during exposure to hyperbaric air and hyperbaric oxygen at various pressures.
What They Found
They found that while both hyperbaric air and oxygen caused hemodynamic changes, hyperbaric oxygen led to greater changes, including a 9% to 19% decrease in heart rate and a 7% to 18% decrease in cardiac output. Pulmonary vascular resistance decreased by 38% to 48%, and right-to-left shunt fraction decreased by 87% to 107% under hyperbaric oxygen conditions, while stroke volume, oxygen delivery, and oxygen consumption remained unchanged.
Canadian Relevance
This study has no direct Canadian connection as none of the authors or institutions are identified as Canadian.
Study Limitations
A limitation of this study is its small sample size of 10 healthy volunteers, which may limit the generalizability of the findings to diverse patient populations.