GE CARESCAPE - How to interpret the BIS values; BIS troubleshooting

Bispectralindex
HowtointerprettheBISvalues
TheBispectralIndexisanabsolutevalue,sobaselineinformationaboutthepatient
isnotrequiredforBISmonitoring.ThefollowingtableliststheBISvaluesandtheir
signicance.
BISvalueClinicalendpoint
Comments
100
AwakePatientrespondstonormalvoice
80
Light/moderatesedation
Patientrespondstoloudcommands
ormildprodding/shaking
40to60
GeneralanesthesiaPatienthaslowprobabilityofexplicit
recallandisunresponsivetoverbal
stimulus
20
DeephypnoticstateEEGsuppression,orburstsuppression
asitissometimesreferredto,isan
easilyrecognizableEEGpattern
characterizedbyburstsofactivity
ofvaryingshapealternatingwith
episodesofatlineactivity.
0
IsoelectricEEGNobrainactivitydetected
ThischartreectsageneralassociationbetweenclinicalstateandBISvalues.Ranges
arebasedonresultsfromamulti-centerstudyoftheBISinvolvingtheadministration
ofspecicanestheticagents.BISvaluesandrangesassumethattheEEGisfreeof
artifactthatcanaffectitsperformance.
TitrationofanestheticstoBISrangesshouldbedependentupontheindividualgoals
forhypnoticstatethathavebeenestablishedforeachpatient.Thesegoalsand
associatedBISrangesmayvaryovertimeandinthecontextofpatientstatusand
treatmentplans.
LowBISvalues(below40)mayindicateoverdosingofhypnoticmedication,andhigh
BIS(over60to65)mayindicatetoolowconcentrationsofthedrug.
BIStroubleshooting
ProblemSolution
Measurementdoesnotstart●Checksensorattachmenttothepatientandthesensorplacement.
●Checkthesensor’scontactwithskin.
●Checkthesensortype.
●Checkallcableconnections.
●Checkthedigitalsignalprocessingunit.
BISsignalispoor●Checkthesensor’scontactwithskin.
●Checkthesensor.
●Ensurethatthedigitalsignalprocessingunitisnotclosetoany
electricalradiatingequipment.
2062971-001CARESCAPEModularMonitors399