Use Instructions

SpiroSphere
®
ECG Instructions for Use
Page 64/136
Version 02.02 • 04AUG2022
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
Three unipolar limb leads: aVR, aVL and aVF (according to Goldberger)
I II III
Six unipolar chest leads: V1, V2, V3, V4, V5, V6 (according to Wilson)
V1 V2 V3 V4 V5 V6
In contrast to the limb leads, the chest leads have to be positioned precisely. The lead positions
are internationally standardized.
V1
V2
V3
V4
V5
V6
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
Lateral view of lead positions
MCLL
VAXL
MAXL =
mid-axillary line