68 Chapter 5 Performing ECG Tests Welch Allyn CP 200 Electrocardiograph
Adjusting the ECG Waveforms
The following softkeys appear on the Auto ECG Acquisition and Rhythm ECG screens
(
Figure 38 on page 58 and Figure 41 on page 63). Use these softkeys before printing an
Auto ECG or while printing a rhythm ECG.
Softkey Effect
Leads Cycles through the leads in groups of three on the screen. For rhythm reports, also cycles through the lead groups that are
printing (if <12). To learn how to change the number of leads per group—3, 6, or 12—on rhythm reports, see
“Reviewing
the Rhythm Report Settings”
on page 47. To learn how to change between standard and Cabrera lead groupings, see
“Reviewing the Miscellaneous ECG Settings” on page 48.
Gain Cycles through the gain settings in mm/mV (5, 10, 20, AUTO), zooming in and out. (AUTO is available for Auto ECGs only,
not rhythm ECGs. AUTO is usually the best setting, but some waveforms may be easier to read on other settings.) To learn
how to change the gain’s default setting, see
“Reviewing the Miscellaneous ECG Settings” on page 48.
Baseline Filter Toggles between the two baseline filter settings (on or off). This filter reduces “wandering baseline,” an upward and
downward fluctuation of the waveforms. It is preferable, if possible, to eliminate or reduce wandering baseline by
addressing the causes, as explained on
page 90. To learn how to change the filter’s default setting, see “Reviewing the
Miscellaneous ECG Settings”
on page 48. Caution: You cannot perform ST segment analysis on waveforms that were
recorded with the baseline filter turned on. For details, see the caution on
page 60.
Muscle Filter Toggles between the two muscle filter settings (on or off). This filter reduces muscle tremor interference: random,
irregular voltage superimposed on the waveforms. It is preferable, if possible, to eliminate or reduce muscle tremor by
addressing the causes, as explained on
page 90. To learn how to change the filter’s default setting, see “Reviewing the
Miscellaneous ECG Settings”
on page 48. Caution: You cannot perform ST segment analysis on waveforms that were
recorded with the muscle filter turned on. For details, see the caution on
page 60.
Speed
(available for
Rhythm ECGs only)
Cycles through the paper speed settings in mm/sec (10, 25, 50).
5 mm/mV 20 mm/mV
10 mm/mV
Wandering baseline
Muscle tremor interference
50 mm/sec
25 mm/sec 10 mm/sec
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