Kapnometrie und Kapnographie

  • T. Pasch


Kapnometrie ist die Messung des Kohlendioxids (CO2) im Atemgas während des gesamten Atemzyklus, Kapnographie die fortlaufende Darstellung der kapnometrisch erfaßten CO2-Kurve auf einem Monitor oder einem permanenten Registriersystem. Die entsprechenden Geräte werden als Kapnometer oder als Kapnograph bezeichnet, eine dargestellte Kurve als Kapnogramm. Oft wird in eingeschränkter und nicht ganz korrekter Weise unter Kapnometrie die fortlaufende Messung und Anzeige des endexspiratorischen CO2Wertes verstanden, ggf. kombiniert mit dem inspiratorischen Wert [2, 32]. In Abhängigkeit vom verwendeten Meßprinzip wird entweder der CO2-Partialdruck (pCO2) oder die fraktionelle CO2-Konzentration (FCO2) bestimmt. Beide können über die Beziehung pCO2 = FCO2 (pB — pH2O) ineinander umgerechnet werden (pB = Barometerdruck; pH2O = Wasserdampfdruck). Viele neue Geräte erlauben wahlweise die Darstellung als pCO2 oder FCO2.


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© Springer-Verlag Berlin Heidelberg 1998

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  • T. Pasch

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