Airwaygases
ProblemSolution
Whycanweseevariationsintheoxygramduring
inspiration?
●Changesinthefreshgasowreateandoxygen
concentrationsaffecttheshapeoftheoxygram
duringinspiration.Ruleoutanypotential
clinicalcomplicationssuchashypoventilation,
hyperventilation,circuithypoxia,disconnection.
WhyistheEtCO
2
valueconsiderablylowerthan
theCO
2
partialpressuredeterminedbybloodgas
analysis?
●Themajorclinicalreasonsaredead-space
ventilation,ventilation/perfusionmismatch,adrop
incardiacoutput,alveolarshunts,andincomplete
emptyingofthealveoli.
●Alsocheckthefollowingtechnicalissues:integrity
ofthebreathingcircuit;blood-gasanalysis
correctedtoalowertemperatureincaseof
hypothermia.
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