GE CARESCAPE - Nellcor OxiMax data averaging and updating; Selecting the SpO2 response time; Nellcor OxiMax Saturation Seconds alarm management

Pulseoximetry
NellcorOxiMaxdataaveragingandupdating
TheNellcorOxiMaxalgorithmautomaticallyextendstheamountofdatarequiredfor
measuringSpO
2
andpulseratedependingonthemeasurementconditions.During
normalmeasurementconditionsinthenormalresponsemode,theaveragingtime
is6to7seconds.
Duringdifcultmeasurementconditions,whichcanbecausedbylowperfusion,
motion,ambientlight,electrocautery,otherinterference,oracombinationofthese
factors,theOxiMaxalgorithmautomaticallyextendsthedynamicaveragingtime
requiredbeyond7seconds.
Iftheresultingdynamicaveragingtimeexceeds20seconds,thepulsesearch
conditionwillbeset,whileSpO
2
andpulseratevaluescontinuetobeupdatedevery
second.
Asthemeasurementconditionsbecomeevenmoredifcult,theamountofdata
requiredcontinuestoexpand.Ifdynamicaveragingtimereaches40seconds,the
pulsetimeoutconditionwillbesetandthemodulewillreportazerosaturation
indicatingaloss-of-pulsecondition.
SelectingtheSpO
2
responsetime
NOTE
PDMNellcoronly.
Youcanselecttheresponse(averaging)time.Fast(default)istherecommended
setting.
1.SelecttheSpO
2
parameterwindow.
2.SelecttheSpO2(2)orSpO2(2)tab.
3.Selecttheradiobuttonfortheresponsetime:NormalorFast.
NellcorOxiMaxSaturationSecondsalarmmanagement
NOTE
PDMandTRAMwithprimarySpO
2
measurementandthe
Nellcoroptiononly.
TheSaturationSecondsfeaturehasa“safetynet”designedforpatientswhose
saturationisfrequentlyoutsidethelimitsbutdoesnotremainoutsidethelimitslong
enoughfortheSaturationSecondslimittobereached.Whenthreeormorelimit
violationsoccurwithin60seconds,analarmsoundseveniftheSaturationSeconds
limithasnotbeenreached.
NellcorOxiMaxtechnologyusestheSaturationSecondstodecreasethelikelihoodof
falseSpO
2
saturationalarmscausedbymotionartifact.Itdoesnotapplytopulserate.
Withtraditionalpulseoximetryalarmmanagement,upperandloweralarmlimitsare
set.Duringmonitoring,assoonasalimitisviolated,analarmisgenerated.With
SaturationSecondsalarmmanagement,upperandloweralarmlimitsaresetinthe
samewayastraditionalalarmmanagement.IfthealarmpriorityisEscalating,the
alarmprioritylimitautomaticallychangestoMedium.
ASaturationSecondslimitisalsoset.ThisallowsmonitoringofSpO
2
saturation
outsidethesetlimitsforaperiodoftime(countvalue)beforeanalarmsounds.The
methodofcalculationisasfollows:ThenumberofpercentagepointsthattheSpO
2
saturationfallsoutsidethealarmlimitismultipliedbythenumberofsecondsthatit
remainsoutsidethelimit.Thiscanbestatedastheequation“pointsxseconds=
2062971-001CARESCAPEModularMonitors211