What Researchers Did
Researchers tested various activity-based pacemakers in a miniaturized hyperbaric chamber to see how they performed under simulated diving conditions up to 60 meters (7 ATA).
What They Found
The baseline pacing rate remained unchanged in 27 tests, and sensor-driven rates returned to normal in 18 tests after transient changes. While case distortion was observed in 15 of 29 devices at 60 meters, there was no pacing dysfunction or suppression of the sensor response. Modern accelerometers showed no sensitivity to pressure at 30 meters and 60 meters in most devices.
What This Means for Canadian Patients
This study suggests that while pacemakers might function under hyperbaric conditions, there are risks like case distortion at deeper dives. For Canadian patients with pacemakers who are considering diving, this research reinforces the general recommendation to avoid depths greater than 20 meters (65 feet) due to potential device issues. It highlights the importance of discussing diving safety with their cardiologist.
Canadian Relevance
This study is not Canadian, but it covers topics related to decompression, which is a Health Canada-recognized indication for hyperbaric oxygen therapy.
Study Limitations
This study was conducted using a miniaturized hyperbaric chamber and a limited number of pacemakers, rather than real-world human diving conditions.