Absorption and distribution of S³⁵O₂ inhaled through the nose and mouth by dogs

¹ Vanderbilt University Medical School and Hospital, Nashville, Tennessee

Dogs breathing S³⁵O₂ through the nose and mouth retained a smaller proportion of the inhaled gas in the trachea, lungs, hilar lymph nodes, and liver and spleen than those breathing similar concentrations via a tracheostomy. This conclusion is substantiated by tissue S³⁵ concentration assays, and measurements of the compliance of the lungs and thorax, and of pulmonary resistance. The upper airways therefore partially protect the lungs from exposure to sulfur dioxide.