Certified Hyperbaric Technologist Practice Test

Theoretically, what does mechanical compression of bubbles do during a hyperbaric oxygen (HBO) treatment for DCS?

1. Increases bubble formation

2. Forces nitrogen back into solution and diminishes blood flow blockage

3. Enhances gas expansion

4. Promotes faster ascent rates

The correct answer is: Forces nitrogen back into solution and diminishes blood flow blockage

During hyperbaric oxygen (HBO) treatment for decompression sickness (DCS), the mechanical compression of bubbles plays a crucial role in the treatment process. By increasing the pressure in the hyperbaric environment, the treatment promotes the resorption of nitrogen gas, which is a key factor contributing to DCS. Under normal atmospheric pressure, nitrogen is dissolved in the blood and tissues. When a diver ascends too quickly, the drop in pressure can cause nitrogen to come out of solution and form bubbles, leading to various complications. The elevated pressure used in HBO treatment compresses these bubbles, facilitating the return of nitrogen into the bloodstream, where it can be safely eliminated through the lungs during normal respiration. This mechanism helps to minimize or resolve the blockages in blood flow caused by gas emboli, thereby alleviating symptoms and promoting recovery. In summary, the correct answer illustrates the therapeutic effect of mechanical compression during HBO treatment by demonstrating how it aids in forcing nitrogen back into solution and reducing any associated blood flow obstruction.