Use Instructions

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MasterScope - Instructions for Use
Version 03.00 • Date 19FEB2020
The different measurement setups are commonly referred to as leads.
For a standard 12-lead ECG, four electrodes are placed at the limbs and six at the
chest.
The 12 leads are:
Three bipolar limb leads: I, II and III (according to Einthoven)
I II III
Six unipolar chest leads: V1, V2, V3, V4, V5, V6 (according to Wilson)
In contrast to the limb leads, the chest leads have to be positioned precisely. The
lead positions are internationally standardized.
aVR aVL
aVF
V1
V2
V3 V4 V5 V6
V1
V2
V3
V4
V5
V6
MAXL =
mid-axillary line
VAXL
V1: 4
th
intercostal space, right sternal border
V2: 4
th
intercostal space, left sternal border
V3: midway between V2 and V4
V4: 5
th
intercostal space, left mid-clavicular line
V5: between V4 and V6, left anterior axillary line
V6: level with V4, left mid-axillary line
Three unipolar limb leads: aVR, aVL and aVF (according to Goldberger)