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
5‐20 Monitoring ECG Expression MR400 Instructions for Use
Arrange the ECG lead cable and the clip leads neatly, in a straight
alignment, with no looping.
Avoid contact between cables and bare skin. Cushion the wECG
Use only the ECG lead cables designated for use with this product;
see page 1‐ 35.
Minimize the use of multiple cables. (See the warnings on page 5‐
19 for details.)
The 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
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.
Use 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.
During measurement, check the patient to ensure that MRI‐related
heating is not occurring.
< 7.2 μT.