SOME PHYSIOLOGICAL ASPECTS OF "PULMONARY CAPILLARY" BLOOD
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概要
- 論文の詳細を見る
In 5 cases of mitral disorders and 8 cases of miscellaneous diseases (13 cases in all), gas characteristics and acid-base balance of so-called PC (pulmonary capillary) blood were observed in comparison with those of mixed arterial, mixed venous and capacity blood, and the following results were obtained:1) Compared with mixed arterial and mixed venous blood, O2 content, O2 saturation and O2 partial pressure showed the highest values in PC blood, while CO2 content, plasma HCO3-, H2CO3 and CO2 partial pressure were the lowest in PC blood.2) The reason why the CO2 content of PC blood is remarkably low and close to that of capacity blood is not because PC blood has passed through alveoli twice but because shunting blood which has never passed alveoli streams into PC blood only in a small amount. As CO2 partial pressure of PC blood is considered to be very close to that of alveolar air CO2 partial pressure of PC blood instead of that of mixed arterial blood which has been hitherto used should be employed as CO2 partial pressure of alveolar air for various kinds of calculations, 3) What makes O2 partial pressure of PC blood higher than that of mixed arterial and mixed venous blood is the fact that the former contains large amount of blood which has passed through alveoli more frequently.4) Mean blood pressure and O2 partial pressure of PC blood show a fairly good correlation (r=-0.68, 0.02>p>0.01).5) While plasma HCO3 of PC blood is lower than that of mixed arterial and mixed venous blood, anionized hemoglobin and anionized plasma protein are higher in PC blood than in mixed arterial and venous blood. Therefore, total buffer base of PC blood has no remarkable difference from the other samples. However, since CO2 partial pressure of PC blood is the lowest, pH in PC blood tends to alkaline.
- The Keio Journal of Medicineの論文
著者
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SASAMOTO Hiroshi
Department of Cardiology and Cardiovascular Surgery, Tokai University Hospital
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YOH SHUNTETSU
Department of Internal Medicine, School of Medicine, Keio University
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