V Series Operating Instructions 9 - 31
ECG – Arrhythmia ST Segment Analysis
9.8.1 Learning
The process of learning is used to establish normal beat templates or a stable baseline for accurate ST
analysis. To establish this baseline, the system evaluates the first sixteen normal beats based on
readings from leads II, V, and I.
To establish an accurate baseline, it is recommended that learning be done when the patient is in
stable condition, not moving, and has an ECG rhythm that is free of artifact. Learning should not be
initiated during a primarily ventricular rhythm or other ECG rhythm irregularity because an ectopic
beat may be established as normal.
Learning automatically occurs when:
• Arrhythmia analysis is turned on
• ST analysis is turned on
• Patient monitoring resumes and patient is removed from the Standby mode
• A 3-wire lead set is in use and the current ECG lead is changed
9.8.2 ECG Filters
The ST segment of an ECG waveform often contains low amplitude signals with low frequency
content. To preserve low frequency signal content, the high pass filter is set to 0.05 Hz when ST
analysis is turned on.
TABLE 9-4
FILTER SETTING FILTER BANDWIDTH PURPOSE
Monitor 0.5 Hz to 40 Hz Used for routine cardiac rhythm
monitoring. Limits display of artifact and
baseline wander due respectively to
power line interference and patient
movement. Unless intentionally set
otherwise, the Monitor filter is selected by
default.
ST 0.05 Hz to 40 Hz Allows ST segments to be accurately
measured. If the Monitor filter is in use
when the ST analysis feature is enabled,
the V 12/V 21 monitor automatically
selects the ST filter.
Diagnostic 0.05 Hz to 150 Hz This is the widest bandwidth available.
Effective for diagnostic examination of ECG
wave when patient is not moving. (Patient
movement affects the ECG waveform.) The
Diagnostic filter may also be used with the
ST analysis feature.
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