Case vignette: A 49-year-old, very experienced diver undertook a dive in a Swiss lake with his rebreather (JJ-CCR) in autumn. The water temperature was around 10 °C. After only about 10 minutes, he felt increasing shortness of breath, which rapidly worsened. After about 20 minutes, he had to abort the dive as an emergency. The diver had remained within no-decompression limits (maximum depth 30 m, O₂ set point 1.3 bar). At the surface, he was no longer able to remove his equip

Fallvignette: Ein 49-jähriger, sehr erfahrener Taucher  unternahm im Herbst einen Tauchgang in einem Schweizer See mit seinem Rebreather ( JJ-CCR) . Die Wassertemperatur betrug rund 10 °C . Bereits nach etwa 10 Minuten  verspürte er eine zunehmende Atemnot, die sich rasch verschlechterte. Nach ungefähr 20 Minuten musste er den Tauchgang notfallmässig abbrechen . Der Taucher war in der Nullzeit geblieben  (maximale Tiefe 30 m, O₂-Setpoint 1.3 bar ). An der Oberfläche war er a

From a medical point of view, helium is of little relevance outside of diving. Accordingly, its kinetics have been insufficiently studied in comparison to other inert gases used in medical research and diagnostics, for example as tracers (1). To date, the helium algorithms used in diving medicine are based predominantly on the data set published by Bühlmann. Foto: Karin Aggeler Helium in the Bühlmann model According to Bühlmann, the diffusion rate of helium is 2.65 times high