Specifications

IQmark Digital ECG Operation Manual
20
Instructions for Performing ECG Acquisition
 NOTE: Please refer to the Quick Reference User’s Guide – Performing a 12-lead
Resting ECG Test for more detailed instructions.
Patient Position
The patient should be placed comfortably in a supine position. Any variation should be
noted on the ECG report.
Electrodes
When using disposable electrodes, check to ensure the electrode is fresh and sticky.
Always make sure your fingers are clean and free of lotion when handling electrodes.
Skin Prep
Patients with excessive chest hair should be shaved at the electrode site. Abrade these
areas with fine sandpaper or an abrasive pad, and then clean with alcohol-saturated
gauze. Allow the skin to air dry.
Limb Lead Placement
RA (White) – Right Arm electrode is placed on a distal portion
of the right lateral side of the upper arm below the shoulder.
LA (Black) – Left Arm electrode is placed on a distal portion of
the left lateral side of the upper arm below the shoulder.
RL (Green) – Right Leg electrode is placed on the inside calf,
midway between knee and ankle.
LL (Red) – Left Leg electrode is placed on the inside calf,
midway between knee and ankle.
Precordial Lead Placement
V1 (Red) – 4
th
intercostal place at the right margin of the sternum.
V2 (Yellow) – 4
th
intercostal place at the left margin of the sternum.
V3 (Green) – Midway between V2 and V4 (on top of the 5
th
rib).
V4 (Blue) – 5
th
intercostal place at the left mid-clavicular line.
V5 (Orange) – At the horizontal level of V4, at the left anterior line.
V6 (Purple) – At the horizontal level of V4, at the mid-axillary line.
Figure 3-0 ECG Hookup Diagrams
 NOTE: Lead placement does affect the ECG waveform. When the limb leads are
placed on the torso, waveform changes might be seen in the QRS
amplitude, axis shift occurs, Q waves can be seen, and T waves might
appear flipped or flattened. These changes are clinically significant in that
they are associated with cardiac ischemia. If a non-standard lead
placement is used, note the variation in the ECG comment field.
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