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Modified 12-Lead ECG
If your institution uses modified 10-lead ECG electrode placement (the Mason-Likar Lead System),
place the four limb electrodes close to the shoulders and lower abdomen.
The six V electrodes are placed on the chest in the same position as the conventional 12-lead
placement.
Choosing Standard or Modified Electrode Placement
WARNING
Do not use ECG analysis interpretation statements and measurements for 12-lead ECGs obtained
using the modified (Mason-Likar) limb electrode placement. This may lead to misdiagnosis since the
modified (Mason-Likar) limb electrode placement does not look the same as the conventional 12-lead
ECG and may mask inferior infarction due to calculated axis, R, P and T wave magnitudes shifts and
ST slope.
Do not export 12-lead ECGs obtained using the modified (Mason-Likar) limb electrode placement.
Captured 12-Lead ECGs using the modified (Mason-Likar) limb electrode placement exported from
the Information Center are not annotated with the Mason-Likar label.
If your institution uses modified 10 Lead ECG electrode placement (the Mason-Likar Lead System),
you must set
To do this, in the
When
(Mason-Likar)
bandwidth annotation at the Information Center.
When
(Standard)
to
in the monitor.
Limb Leads
on Trunk
Setup ECG
menu, select
Limb Leads
is set to
on Trunk
, and captured 12-lead ECGs will be labeled
is set to
Limb Leads
on Limbs
, and captured 12-lead ECGs will not be annotated at the Information Center.
6 ECG, Arrhythmia, ST and QT Monitoring
LA
1
V1-V6
2
LL
3
RL
4
RA
5
Angle of Louis
6
Limb Leads
then select
on Trunk
, 12 Lead ECG Reports will be labeled
Mason-Likar
, 12 Lead ECG Reports will be labeled
.
12 Lead ECG Report
to the right of the
12 Lead ECG Report
117

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