Welch Allyn Holter System - User Manual - Manual (Page 61)

Directions for Use 57
Troubleshooting
If the Holter System Application malfunctions, you may be able to resolve the issue with
little loss of time and expense. We suggest following the troubleshooting guidelines
below before returning the unit for servicing.
Contact Welch Allyn Customer Support (see page ii ).
Table 19. Lead Quality Problems
Table 20. Lead Quality Problems Causes and Actions
Table 21. Analysis Errors
Condition Cause Actions
General Poor Waveform quality 1, 2, 3, 4, 5 See Table 20 .
AC interference (even-peaked, regular voltage
superimposed on the waveforms). May resemble or
coincide with muscle-tremor interference. 1, 2, 3, 4, 5 See Table 20 .
If AC interference persists, turn AC Filter on. See “System Settings
Tab” on page 36.
Muscle tremor interference (random irregular voltage
superimposed on the waveforms). May resemble or
coincide with AC interference 1, 2, 3, 4, See Table 20 .
If muscle tremor interference persists, turn Muscle Filter on.
See
“System Settings Tab” on page 36.
Wandering baseline (an upward and downward
fluctuation of the waveform) 1, 2, 3, 4, See Table 20 .
If wandering baseline persists, turn baseline filter on. See “System
Settings Tab” on page 36.
Cause Action
1 Electrodes positioned on a bony area. Reposition electrodes.
2 Date Code on Hook-up kit expired. Check the expiration date on the
Hook-up kit packaging. Apply new electrode.
3 Insufficient or dried electrode gel Apply new electrode.
4 Oily Skin or body lotions Clean Skin with alcohol or acetone
5 Excessive hair on chest Shave hair from chest prior to hookup
6 Poor skin preparation. Remove sensor(s), repeat skin prep, select new position (see
hookup procedure), and apply new electrodes.
7 Faulty patient cable Replace patient cable.
Condition Cause Action
Pause errors Low Amplitude signal causing misdetection
creating long coupling interval
Pause threshold set too low
Artifact prevents QRS detections creating long
coupling interval. Reposition electrode to increase signal amplitude.
Check that Pause threshold set to desired threshold.
See
“Clinical Settings” on page 33.
Ventricular errors Form Incorrectly classified
Excessive noisy trace causes false interpolated
beats
Excessive noisy trace causes distortion of original
QRS signal Confirm that Form Classifications are correct and edit any
that are not.
Improve patient hookup prep.
Perform beat edit to correct beat classification