Respiratory experiments on man / Yandell Henderson.

  • Henderson, Yandell, 1873-1944.
Date:
1914
Catalogue details

Licence: In copyright

Credit: Respiratory experiments on man / Yandell Henderson. Source: Wellcome Collection.

Provider: This material has been provided by The Royal College of Surgeons of England. The original may be consulted at The Royal College of Surgeons of England.

    13/14 (page 11)
    Gorman & C'ov 187 Westminster Bridge Road, London. They analyze for carbon dioxid, oxygen and combustible gases. I have recently suggested to Siebe, Gorman & Co. that they supply a smaller Haldane apparatus to analyze only for carbon dioxid and to be called “The Small Haldane Apparatus for Clinical Purposes.” They are also sole makers of the Douglas bag, Hill bag, and other useful respiratory apparatus. Bohr gas meters [1 and 10 liters per revolution] are also very useful. They are made by the Dansk Maaler Fabrik, Copen- hagen.) IX. METABOLISM EXPERIMENTS DURING REST AND EXERCISE WITH THE DOUGLAS BAG This apparatus consists of a nose-clip, mouthpiece, inspiratory and expiratory valves, a large three-way tap and a rubber bag carried on the back. During a meas- ured period of time (from one to five minutes) the entire volume of the expired air is caught in the bag. The volume of this air is later measured and its oxygen and carbon dioxid content determined by analysis. The oxygen consumption, and carbon dioxid elimination per minute, and the respiratory quotient are thus determin- able in man under normal conditions and forms of exercise. X. THE DEAD SPACE OF THE RESPIRATORY TRACT The large rubber tube is placed over the Haldane analyzer (as in VIII), the other end of the tube being connected either with a rubber bag (capable of contain- ing 3-or 4 liters) or with a small graduated spirometer. After a normal inspiration the subject suddenly makes the deepest possible expiration through the tube into the bag or spirometer. The alveolar air is thus obtained and determined as in Experiment VIII. A sample of the air in the bag or spirometer is also analyzed, and the total volume of the expiration measured. From these data, and the dead space of the apparatus, the volume of the dead space of the respiratory tract (assumed to have been filled with air containing no carbon dioxid) is easily calculated. This method which I devised has not previously been published. Tt is now being used in experiments to determine the influence of close, fresh and chill air on the dilatation and contrac- tion of the bronchi.