Welch Allyn Cardio Perfect Exercise ECG Quick Start Guide - Quick Reference Guide - Manual (Page 6)

Condition Causes Actions
A dot is flashing on the Lead Off screen.
OR
Lead-off information is displayed on the screen.
OR
One or more leads prints as a square wave:
• Electrode contact may be poor.
• A lead may be loose.
• Reattach the lead.
• Replace the electrode.
• Verify that the electrode area has been properly
prepared: shaved, cleaned with alcohol or acetone,
allowed to dry.
• Verify that electrodes have been properly stored
and handled.
Wandering baseline (an upward and
downward fluctuation of the waveforms): • Electrodes that are dirty, corroded, or loose.
• Insufficient or dried electrode gel.
• Oily skin or body lotions.
• Rising and falling of chest during rapid or
apprehensive breathing.
• Clean skin with alcohol or acetone.
• Reposition or replace electrodes.
• Help patient relax.
• If wandering baseline persists, turn the
baseline filter on.
Muscle tremor interference (random, irregular
voltage superimposed on the waveforms). May
resemble or coincide with AC interference: • Patient is uncomfortable, tense, nervous.
• Patient is cold and shivering.
• Exam bed is too narrow or short to
comfortably support arms and legs.
• Arm or leg electrode straps are too tight.
• Help patient get comfortable.
• Check all electrode contacts.
• If interference persists, turn the muscle-tremor
filter on. If interference still persists, the problem
is probably electrical in nature. See the following
suggestions for reducing AC interference.
AC interference (even-peaked, regular voltage
superimposed on the waveforms).
May resemble or coincide with muscle tremor
interference: • Electrodes that are dirty, corroded, or loose.
• Insufficient or dried electrode gel.
• Patient or technician touching an electrode
during recording.
• Patient touching any metal parts of an exam
table or bed.
• Broken lead wire, patient cable, or power cord.
• Electrical devices in the immediate area,
lighting, concealed wiring in walls or floors.
• Improperly grounded electrical outlet.
• Incorrect AC filter frequency setting or
AC filter is turned off.
• Verify that the patient is not touching any metal.
• Verify that the AC power cable is not touching the
patient lead cable.
• Verify that the proper AC filter is selected.
• If interference still persists, the noise may be caused
by other equipment in the room or by poorly grounded
power lines. Try moving to another room.
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© 2007 Welch Allyn REF 101911 Mat. Number: 708551, Ver: B