GE CARESCAPE - Page 332

PatientSpirometry
StaticPEEPimeasurement
InstaticPEEPimeasurement,anend-expiratorypause(occlusionmaneuver)ofat
leastfoursecondsisproducedattheventilator.Whentheairwayisoccludedatthe
end-expiration,andifthepatientishyperinated,alveolarpressureswillequilibrate
withtheairwaypressuremeasuredinD-lite(+)/Pedi-lite(+),whichwillriseuntila
plateauisreached,correspondingtototalPEEPorPEEPi,ifsetPEEPis0.
NOTE
IfboththedynamicandstaticPEEPiaremeasured,the
dynamicvaluesareusuallyslightlylower.
●x=Time
●y=Paw
1.PEEPtot
2.End-expiratorypressurehold
3.Expiratoryow
I:Eratio
I:Eratioisanexpressionoftherelationshipofinspirationtimetoexpirationtime.A
typicalvalue0.5meansthattheexpirationtimeistwicetheinspirationtime.The
followingexamplesillustratethedifferencebetweenI:Edurationsof1:2and1:3.
Ifrespirationrateis10breaths/min(respirationcycle6seconds)andI:Eis1:2,thenthe
inspirationtimeis2.0secondsandtheexpirationtimeis4.0seconds:
●x=Time
●y=V
1.Inspiration
2.Expiration
Ifrespirationrateis10breaths/min(respirationcycle6seconds)andI:Eis1:3,thenthe
inspirationtimeis1.5secondsandtheexpirationtimeis4.5seconds:
332CARESCAPEModularMonitors2062971-001