ECG MONITORING
Model 3000T Operation Manual
21
ECG Electrodes
ECG electrodes vary in both construction and quality between the different manufacturers, however typically there
are two main groups, long term monitoring electrodes and short term monitoring electrodes. Ivy recommends the
use of short term monitoring electrodes which stabilize faster due to their higher chloride content. For the best
performance Ivy especially recommends the Ivy ECG Electrodes (Ivy P/N: 590342).
Prior to applying the ECG electrodes to the patients skin, Ivy recommends preparing the electrode location by
rubbing the skin with a dry gauze pad or alternatively, if it is necessary to remove cream or powder from the
patients skin, warm soapy water .
Impedance Measurement (Model 3000T-B only)
The Model 3000T has unique hardware and software which allows the measurement and identification of the
impedance value between the patient’s skin and each individual ECG electrode. (RA, LA, and LL).
The purpose of the impedance measurement is to verify proper skin preparation and proper ECG electrode
application and to assure a good ECG signal and therefore a reliable trigger pulse. Ivy recommends that the
impedance value of each ECG connection be less than 50,000 (50k). The use of the wrong type of ECG
electrodes, improper application or poor skin preparation can increase the electrode impedance value, causing an
imbalance between the leads which can allow noise to be induced into the ECG signal which can cause inaccurate
trigger pulses.
In the standard default mode the impedance value of each ECG electrode can be measure by pressing
the Measure Impedance soft key on the main menu screen (See below).
The impedance value is displayed in the top right hand quadrant of the display.
Impedance values of less than 50k are displayed in green.
Should any electrode impedance value be over 50k, the appropriate lead(s) will flash the value in red
indicating that the value is outside the recommended range.
If the measurements are in red remove the ECG electrodes and clean the skin with a gauze pad before re-
applying a fresh ECG electrode.
For proper skin preparation follow the instructions indicated on the ECG electrode packaging.
Re-measure skin impedance after 1-2 minutes of repositioning electrodes on the patient skin.
The Model 3000T can also be set up to take two measurements after the LEAD OFF alarm disappears. The
measurements will occur at 30 and 60 seconds intervals after the LEAD OFF alarm is inactive. For information on
how to activate this feature contact Ivy biomedical Systems Inc at (203) 481-4183.
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