The Patient Session
3-20 ST80i Stress Test System Instructions for Use
To attach the electrodes to the patient
1
Place the gel area of the electrode over the center of the prepared area, using the
positioning described in Table 3-1 and illustrated in Figure 3-5; then press the adhesive
ring into place.
– Avoid pressing the center of the gel area; this might hinder conduction.
– Place the electrodes on the soft tissue of the arms, avoiding muscle. See limb lead
placements notes next.
Lead placement is similar to standard 12-Lead ECG placement; however, limb leads are
modified, as follows:
– Right Arm and Left Arm leads should be placed close to the shoulders on the clavicle
bone, away from the muscular areas to avoid muscle interference.
– The Right Leg lead is typically placed on the sternum midway between the arm leads
and V1 and V2 leads.
– The Left Leg lead should be placed on a rib, below V6 by about 2 fingers, in the lower
left area of the patient’s chest (avoiding flabby areas and the belt). This may need
adjustment depending on body habits.
2 Ensure the electrodes are firmly attached.
A good test for firm electrode contact is to try to move it. If it moves easily, the electrode
connection is too loose. Do not allow electrodes to move in any way.
3 Have the patient raise their arms over their head. This will help verify good lead
placement and no strain on the electrodes.
Place the limb electrodes for the arm directly on the
clavicle bones (away from major muscles)
Below V6 on the ribcage
On the sternum, midway between the clavicle and the
4th intercostal space
Table 3-1 Leads and positioning
AAMI Lead IEC Lead Electrode Position
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