The Use of Hydrogen as an Inert Gas During Diving:Pulmonary Function During Hydrogen-Oxygen Breathing at Pressures Equivalent to 200Feet of Sea Water.

摘要

A review of the characteristics of hydrogen as an inert gas for use in diving is presented, with special emphasis on the extention of the respiratory limitation in diving by use of this least dense of all gases. Forced vital capacity (FVC), forced expiratory volume in 1 second (FEV1), forced expiratory volume in 2 seconds (FEV2), peak expiratory flow rate (PEFR), peak inspiratory flow rate (PIFR), and maximal voluntary ventilation (MVV) were measured on four subjects breathing 97% H2-3% O2 at 200 fsw, on two subjects breathing 97% He-3% o2, and on two divers using 97% N2-3% O2. The MVV on H2-O2 at 200 fsw was 14% better than on air at the surface and was improved 40% compared with He-O2 and 171% when compared with N2-O2 at 200 fsw. Similar findings were obtained for the following functions: FEV1, FEV2, PEFR, and PIFR. This is the first study in which pulmonary function has been measured during hydrogen-oxygen breathing. The values in this study for the relationship of relative gas density to flow are in good agreement with both the theoretical and experimental values of Wood and Bryan.