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KMID : 0381219800120030239
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Journal of RIMSK
1980 Volume.12 No. 3 p.239 ~ p.248
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The Effects of Fresh Gas Flow to the Arterial CO₂ Tension in General Anesthesia
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Abstract
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The criterion of satisfactory lung function is the maintenance of normal levels of oxygen and carbon dioxide in the arterial blood. In the conscious state, while breathing air, homeostatic mechanisms ensure that blood-gas levels remain close to normal under widely varying circumstances. But in the unconscious state during general anesthesia using many different drugs and mechanical or manual ventilation, these mechanisms will be partially or completely destroyed.
Because the problems of hypercapnia due to underventilation during general anesthesia are? well appreciated, there is a tendency to overventilate rather than underventilate; the result usually is an undesirable and even detrimental degree of hypocapnia. The ideal appears to bee keep carbon dioxide tension of arterial blood in the low normal range.
The purpose of this study was to determine the changes of carbon dioxide level with regulating the minute volume by eliminating or noneliminating the carbon dioxide absorber fromordinary anesthesia circle system and at the same time regulating the flow rate of fresh gas using mechanical and manual ventilation during general anesthesia.
The results are as follows:
1) If the adequate minute volume is delivered, there are no significant differences in the influences of mechanical or manual ventilation in the ordinary anesthesia circle system to the arterial blood gases.
2) Significant hypercapnia is not developed even regulating 20ml/kg/minute of fresh gas flow (F.G.F.) in both mechanical and manual ventilation with carbon dioxide absorber when the tidal volume is maintained at least 6ml/kg in the ordinary anesthesia circle system.
3) In the mechanical ventilation without carbon dioxide absorber, hypercapnia is not observed when tidal volume and F.G.F. is at le ast 6ml/kg and 80m1/kg/minute respectively.
4) In the manual ventilation without carbon dioxide absorber, there are risks of hypercapnia when F.G.F. is maintained below 60ml/kg/minute.
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