What Researchers Did
Researchers reviewed multiple factors that may affect cardiac function and haemodynamics during recreational underwater diving.
What They Found
Researchers identified several factors affecting cardiac function during diving, including increased afterload from high-density gas and cold exposure, and a slowed heart rate due to hyperoxia. Immersion increases preload, and decompression can elevate right heart pressures, potentially causing paradoxical embolism in patients with a right-to-left shunt.
What This Means for Canadian Patients
Canadian cardiac patients considering recreational diving should be aware of the significant physiological stressors on the heart, such as changes in afterload, preload, and heart rate. Cardiologists in Canada should counsel these patients on the potential risks and necessary precautions to prevent adverse cardiac events during underwater activities.
Canadian Relevance
This study has no direct Canadian connection as it was not conducted in Canada nor involved Canadian participants.
Study Limitations
A limitation is that this review discusses known physiological responses without presenting new experimental data or specific quantitative findings.