Biomedical Engineering Reference
In-Depth Information
Fig. 1.6 Augmented lead
positions and connections
Fig. 1.7
Precordial lead
positions
Table 1.3 Lead positions of
precordial or chest leads
Lead name
Position
V1
Right 4th intercostal space
V2
Left 4th intercostal space
V3
Halfway between v2 and v4
V4
Left 5th intercostal space
V5
Horizontal to v4, anterior auxiliary plane
V6
Horizontal to v5, mid-auxiliary plane
ECG in a horizontal plane. The lead positions are shown in Fig. 1.7 and Table 1.3 .
The six frontal plane leads (I, II, III) and six horizontal plane leads constitute
12-lead ECG system which is by far the most common and accepted method of
mapping of ECG signal from a patient. More details of ECG lead systems can be
found at [ 5 ].
1.6 ECG Recording
ECG record in a clinical set up is generated through an electrocardiograph
machine, with electrodes connected to the patient body. It incorporates an
amplifier, filter, patient isolation, and mechanical printing arrangement. A ther-
mally sensitive, graduated strip chart paper is driven at a speed of 25 mm/s (most
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