Assessment of intravascular gas formation in divers in a closed circuit diving rebreather

The aim of the work is to evaluate and compare intravascular decompression gas formation in divers after short-term diving in a pressure chamber using air and oxygen-nitrogen-helium mixture for breathing in diving dosed circuit diving rebreathers with electronic control. 6 divers were examined after 30 man-descents to depths from 40 m to 100 m using working and training modes. With the help of two methods of ultrasound diagnostics, such as dopplerography with sound location and transthoracic two-dimensional echography, intravascular decompression gas formation was assessed directly at the site of the diver's descent. The main results of the study showed that with a reduction in decompression time by 2-2.5 times, the degree of intravascular decompression gas formation in the subjects during descents in diving dosed circuit diving rebreathers with electronic control increased slightly and did not lead to the onset of symptoms of acute decompression sickness. This study remains relevant for working diving descents in open water, since the proposed methods make it possible to assess intravascular gas formation directly at the site of diving operations.