Philips Expression MR400 - Setting Alarm Limits Globally

4‐12AlarmsExpressionMR400InstructionsforUse
TheExtremeTachycardiadeltavaluewillretainitsadjustedvalueastheHRhighalarmlimit
settingisadjusteddownward,butwillbegintoshrinkinvalueasthehighalarmlimitsettingis
adjustedclosertothealarmlimitmaximum.
Desat
AlarmSetting
TheDesatalarmsettingisres trictedtoamaximumvaluethatis2lesstheSPO2lowalarmlimit
setting,while theminimumsettingcanbeaslow asthealarmminimum.Seepage6‐11forsetting
details.
AslongastheSPO2parameterison,theDesatalarm
valuewillretainthissettingevenifthefunc‐
tionisturnedoffandon.
TheSPO2alarmadjustmentsaredesignedtogiveprioritytothe Desatalarmsetting.Therefore,
theSPO2lowandhighalarmlimitsmayalsobeadjustedbasedonachangemadetotheDesat
alarmsetting.
WhenevertheDesatalarmsettingischanged,thefollowingrules determinethe
lowerandupperSPO2alarmlimits:
•IftheDesatalarmwasturnedonafterbeingsetandturnedoff,thenifthelastsetvalueof
theSPO2lowalarmlimitislessthantheDesatalarmsettingplus
2,theSPO2lowalarm
limitwillbesettotheDesatalarmsettingplus2.
•IftheDesatalarmisadjustedupwardsothatthesettingisgreaterthanorequaltothe
SPO2lowalarmlimitminus2,thentheSPO2lowalarmlimitwillbeincreasedbythe

systemsuchthattheDesatalarmsettingplus2isalwaysmaintained(i.e.,thelowalarm
limitwillalwaysmovetostaytwogreaterthanDesatalarmsetting).Iflowalarmlimitis
alteredduetothisscenario,lowalarmlimit willretainthisalteredvalueeveniftheDesat
alarmsettingisadjusteddownward.
•TheSPO2highalarmlimitwillbeadjustedasnecessaryinrelationtothelowalarmlimitas
perthenormalbehavioroflowandhighalarmlimits.
•TheSPO2lowalarmlimitwillbeallowedtobeadjusteddownwardonlyuntilitisequalto
the
Desatalarmsettingplus2.Nofurtherdownwardadjustmentoflowalarmlimitwillbe
alloweduntiltheDesatalarmsettingisadjusteddownward.
Setting Alarm Limits Globally
Globalchangestoallofthelowerandupperalarmlimitsettingscanbemadeautomaticallyby
pressingtheusingthe1‐TouchAlarmskey.Theseglobalchangesarecalculatedusing
percentagesselectedinthe1‐TouchHigh%andthe1‐TouchLow%options;seepage4‐17.
During
calculationsifapatient’smonitoredvalueissohighorlowthatitwouldexceedthealarm
limitrangefortheparameter,thenthealarmlimitwillbesettothehighestorlowestpossible
valuebutnotoff,asindicatedinthetableonpage4‐22.Forexample,
ifafterpressingthe1‐
TouchAlarmskey,apatient’sSPO2upperalarmlimitsettingwas99(thehighestallowable
value),thenanalarmwillbegeneratedifthe patient’sreadingreaches100.(Toturnoffanalarm
limit,seeSettingAlarmLimitsIndividuallyonpage4‐13.)
Alsonotethat
settingalarmlimitsgloballymayresultinalowerSPO2alarmlimitthanthe
defaultsetting.ForapatientthathasanSpO2readingof99%,thenew upperlimitwillbe99but
thenewlowerlimitwillbe79(insteadof85)ata1‐TouchHigh%of
20(factorydefault).