Oxygen Prebreathe for Decompression Sickness

This trial tests whether breathing pure oxygen before and during exercise can prevent decompression sickness, a condition that occurs when the body experiences a sudden drop in pressure, such as in space or deep-sea diving. Volunteers will breathe oxygen and then enter a chamber simulating low-pressure environments while researchers monitor for any symptoms. This study seeks healthy adults who do not smoke, have good exercise capacity, and do not have conditions like heart or lung disease.

As an unphased study, this trial provides a unique opportunity to contribute to scientific knowledge and potentially enhance safety measures for activities involving pressure changes.

Research has shown that breathing pure oxygen before exposure to low-pressure environments, such as a hypobaric chamber, can be safe and effective. Studies have found that this method significantly reduces the risk of decompression sickness (DCS), which occurs when bubbles form in the blood and tissues due to a drop in pressure. For instance, one study demonstrated that breathing 100% oxygen at a specific pressure completely prevented DCS during spacewalk practice.

However, potential risks exist. Breathing high levels of oxygen can sometimes cause oxygen toxicity, leading to symptoms like dizziness or even seizures if not monitored carefully. These risks remain low with proper supervision and controlled settings.

Researchers are excited about using oxygen prebreathe for decompression sickness because it offers a proactive approach by preparing the body before exposure to lower pressure environments. Unlike current treatments that typically address symptoms after they occur, this method aims to prevent decompression sickness by saturating the body with oxygen beforehand. This proactive strategy could reduce the incidence of symptoms and improve safety for individuals exposed to hypobaric conditions, such as divers and astronauts.

Research has shown that breathing pure oxygen before activities like spacewalks can greatly lower the risk of decompression sickness (DCS). One study found that using 100% oxygen at a pressure of 10.2 psi during spacewalk preparations completely prevented DCS. In this trial, participants will undergo an oxygen prebreathe followed by hypobaric chamber exposure with exercise and monitoring. Breathing oxygen beforehand has been proven to reduce air bubbles and blood cell activity linked to DCS. Other studies confirm that this method works better than breathing normal air and is a trusted way to prevent decompression problems for divers and astronauts. Overall, the evidence strongly supports that breathing oxygen before these activities helps avoid decompression sickness.¹⁶⁷⁸⁹