What interventions are typically contraindicated during HBOT?

During hyperbaric oxygen therapy (HBOT), certain medical interventions can pose significant risks due to the high-pressure environment and increased oxygen levels within the hyperbaric chamber. The correct answer reflects that specific types of injections, particularly those that could introduce air into the bloodstream, are contraindicated during HBOT. Introducing air can lead to serious complications such as air embolism, which can be life-threatening in a hyperbaric setting where the ambient pressure alters the behavior of gases in the body.

Blood transfusions, routine blood tests, and physical therapy are generally not contraindicated during HBOT, as they do not carry the same risks associated with the introduction of air. Blood transfusions can be safely administered as needed, routine blood tests can often still be performed, and physical therapy may be conducted according to specific guidelines to avoid complications. Hence, the intervention that stands out as contraindicated directly relates to the risk of air entering the vascular system, which is critical to avoid during hyperbaric treatments.