6 ECG, Arrhythmia, ST and QT Monitoring
117
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
Limb Leads to on Trunk in the monitor.
To do this, in the
Setup ECG menu, select Limb Leads then select on Trunk.
– When
Limb Leads is set to on Trunk, 12 Lead ECG Reports will be labeled 12 Lead ECG Report
(Mason-Likar)
, and captured 12-lead ECGs will be labeled Mason-Likar to the right of the
bandwidth annotation at the Information Center.
– When
Limb Leads is set to on Limbs, 12 Lead ECG Reports will be labeled 12 Lead ECG Report
(Standard)
, and captured 12-lead ECGs will not be annotated at the Information Center.
1 LA
2 V1-V6
3 LL
4 RL
5 RA
6 Angle of Louis
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