ECG MONITORING
26 Model 7600/7800 Operation Manual
9.4 Impedance Measurement (Model 7800 Only)
The Model 7800 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, LL and RL).
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 50,000Ω (50kΩ). 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.
• The impedance value of each ECG electrode can be measured by pressing the Measure Impedance touch
key on the screen. Note: ECG is not monitored during impedance measurements. ECG recovers within 8
seconds after pressing the Measure Impedance touch key.
• The impedance value is displayed in the top left hand portion of the display.
• Impedance values of less than 50kΩ are displayed in blue.
• Should any electrode impedance value be over 50kΩ, 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 or a skin
prep gel such as Nuprep gel (Ivy P/N: 590291) 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’s skin.
Impedance
Values
in kΩ
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