In older infants and preschool children lung function tests can only be performed if the annoyance of the child is of such a short duration that test material can be taken before important changes in respiration take place, or if, the child is bothered in such a small extent that permits them to sleep during the investigation. – These conditions can be realized only for some of the available tests. CO2 analysis in ventilated air performed by infrared method allows a judgement of changes in ventilation. Microgasanalysis in the arterialized cutaneous blood during breathing room air or 40% O2 to some extent permits the differentiation of arterial hypoxemia.

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© 1970 S. Karger AG, Basel
1970
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