Philips Expression MR400 - Page 184

5‐20MonitoringECGExpressionMR400InstructionsforUse
PositioningtheECGleadcable
PositionandkeeptheECGleadcablesinastraightline.Never
allowtheECGleadcablestotouchtheMRsystembore.Any
loop(circular,U‐shaped,S‐shaped)inthecablesorcable
contact
withtheMRsystemborewillcauseheatinginthe
cablesorinthepatientelectrodes.Followthestepsbelowto
minimizethecableheatingrisk.
TominimizetheriskofMRI‐relatedheating
Step Action
1
ArrangetheECGleadcableandtheclipleadsneatly,inastraight
alignment,withnolooping.
2
Avoidcontactbetweencablesandbareskin.CushionthewECG
module.
3
UseonlytheECGleadcablesdesignatedforusewiththisproduct;
seepage1‐35.
4 Minimizetheuseofmu ltiplecables.(Seethewarningsonpage5‐
19fordetails.)
5ThewECGmodule,ECGleadcablesandQuadtrodeelectrode
are
acceptableforusewithinMRsystemswithstaticmagneticfield
strengthsof3.0TeslaorlesswithintheMRsystemboreusingaMR
systemreportedwholebodyaverageSpecificAbsorptionRates
(SAR)upto4.0W/kg.EnsurethatB1
rms
<7.2μT.
6 MonitoringofECGatpowerlevelsofgreaterthanaMRsystem
reported,wholebodyaveragedSARof4W/kgisnotrecommended
forthegeneralpatient population.Suchmonitoringmustonlybe
attemptedwithconsciouspatientswithnormalthermoregulatory
capabilitiessothattheymaywarnyouof
possibleexcessiveheatat
themonitoringsites.
7Usecautionforscantimes(thatis,perpulsesequence)greater
than15minutes.ForMRIscanswithaverageSAR>1W/kg,limit
scantimeto15minutesandpauseatleast3minutesbetween
scanstoallowtheECGelectrodestocool.
8Duringmeasurement,checkthepatienttoensurethatMRI‐related
heatingisnotoccurring.