J.Jpn. Surg. Soc.. 58(2): 215-238, 1957
STUDIES ON THE MECHANICAL HEART-LUNG APPARATUS: ESPECIALLY ABOUT INFLUENCES OF EXTRACORPOREAL CIRCULATION ON BLOOD GASES
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Ist Surgical Department, Nagoya University School of Medicine (Director: Prof. Yoshio HASHIMOTO) Wasaburo KIMATA |
2) Though oxygen saturation rate in arterial blood was maintained generally within normal level during extracorporeal circulation, arterial oxygen content decreased in all cases due to dilution of blood by addition of physiological salt solution.
3) During extracorporeal circulation it was found that stagnant anoxia was apt to occur than that of other types, and was found, in order to know the existence of anoxia, that it was more rational to observe O2 saturation in mixed venous blood than to observe that in oxygenated blood.
4) During extracorporeal circulation blood pH decreased remarkably in spite of marked decrease of blood COO2. By injection of NaHCOO3 solution for metabolic type acidosis, decrease of blood pH was checked.
5) In order to omit one pump venous blood was withdrawn from the venae cavae directly into the oxygenator by utilizing a fall of about 90cm, by which sufficient blood circulation volum was obtained and the unbalance between suction and introduction and the risk of stagnant anoxia were almost eliminated.
(author's abstract)
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