Abstract
In order to estimate the oxygen and carbon dioxide in mixed venous blood in intact dogs two methods are in use: (1) a tonometer method in which alveolar air and pulmonary venous blood are allowed to come into equilibrium; the air is then analyzed. (2) A method of direct puncture of the right auricle or ventricle in order to obtain venous blood. A third method is possible and is now described.We devised a cannula which can be inserted into the right ventricle through the right external jugular vein. Through this samples of mixed venous blood can be withdrawn from the right heart. The cannula is a hollow metal tube 2.5 mm. in diameter and 30 cm. long, having an obturator which is bullet shaped closing its distal end. The obturator can be withdrawn and the proximal opening closed by a small stopcock. Below the stopcock is an outlet to which a piece of rubber tubing is attached Before use the air in the cannula is replaced by sterile albolene.The operation is carried out aseptically. The skin and subcutaneous...
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