GE CARESCAPE - Basics of airway gases measurement; Airway gases measurement description, CARESCAPE respiratory modu; Airway gases measurement description, E-miniC

Airwaygases
Basicsofairwaygasesmeasurement
Airwaygasesmeasurementdescription,CARESCAPE
respiratorymodulesandcompactairwaymodules
WithCARESCAPErespiratorymodulesandcompactairwaymodules,youcanmeasure
andmonitorgasesbeingdeliveredtothepatientandexhaledbythepatientthrough
thebreathingcircuit.ThemodulesconsistofaninfraredsensorformeasuringCO
2
andN
2
O,andparamagneticO
2
sensor.TheE-sCAiO,E-sCAiOV,E-CAiO,E-CAiOVand
E-CAiOVXmodulesalsoincludeanestheticagentsmeasurement.
Thegassamplingsystemsamplesthemeasuredairtothemodule,andremoveswater
andimpuritiesfromit.Thepumpofthegassamplingsystemdrawsgasataxedrate
throughthesamplinglineintothegasmeasuringunits.Thegasentersthemodule
throughthewatertrap,whereitisdividedintotwoows,amainowandasideow.
Themainowgoesintotheanalyzers.Thisowisseparatedfromthepatientsidebya
hydrophobiclter.Thesideowcreatesaslightsub-atmosphericpressurewithinthe
watertrap,whichcausesuidremovedbythehydrophobicltertocollectinthebottle.
Afterthemeasurement,gasisexhaustedthroughthesamplegasoutconnector.
NOTE
ThegassamplingsystemoftheE-COVXandE-CAiOVX
modulesdiffersfromthatoftheothercompactairway
modulesandtheCARESCAPErespiratorymodules.Anumber
ofowrestrictorshavebeenchangedtocreateabigger
pressuredifferencewithambientpressureinthegassensors.
Thesampleowis,however,approximatelythesame(200
ml/min).Alargerpressuredifferencemakesthedeformations
ofthegasconcentrationcurveslesssensitivetohigh
variationsoftheairwaypressure.
Airwaygasesmeasurementdescription,E-miniC
TheE-miniCisdesignedforcriticalcareenvironmenttomeasureandmonitorthe
expiredandinspiredCO
2
concentration(EtCO
2
,FiCO
2
)aswellastherespirationrate
(RR)upto80breathsperminute.E-miniChasasampleowof150ml/min.
RespirationratefromtheCO
2
parameteriscountedfromthefrequencyofend-tidal
(peak)CO
2
measurementsperminute.Asufcientrespirationisdenedasa
differenceofatleast1%(atleast7mmHg)betweenthemeasuredinspiredfraction
andend-tidalCO
2
.
Totalsamplesizevolumeduringonerespiratorycycledependsontherespirationrate.
Thefollowingtableshowsdifferentsamplesizevolumeswitha150ml/minsample
owandI:Eratioof1:2.
Respirationrate
10203040
Durationof
inspiration
2.0seconds1.0seconds0.7seconds0.5seconds
Durationof
expiration
4.0seconds2.0seconds1.3seconds1.0seconds
Volume
sampledduring
inspiration
5ml2.5ml1.67ml1.25ml
2062971-001CARESCAPEModularMonitors297