User Manual

ST ANALYSIS
PatientNet Operator’s Manual, v1.04, 10001001-00X, Draft 171
All information contained herein is subject to the rights and restrictions on the title page.
Minimum Episode Duration
For central arrhythmia source patients you can establish a minimum time the ST con-
dition must exist before it is classified as an episode and triggers an alarm.
1. Press the ST Config button on the Patient Settings screen.
2. Press the ST Alarm Config button on the ST Measurement Configuration
screen.
3. Use the arrow buttons under Minimum Episode Duration field to select a
minimum time. The range is 30 to 300 seconds in 15-second increments.
Minimum Period Between Episodes
To distinguish occurrences as independent episodes from segments of the same epi-
sode, you can establish a minimum time period (gap) between episodes. Suppose an
ST level rises above the elevation threshold and is classified as an episode, then drops
to normal before rising again above the threshold level. If the duration of the normal
period reaches or exceeds the minimum gap you set, the system calls a second epi-
sode. If it is less than the minimum gap, it will not be called as a second episode.
To set the minimum gap between episodes:
1. Press ST Config on the Patient Settings screen.
2. Press ST Alarm on the ST Measurement Configuration screen.
3. Press the arrow buttons under Min Gap Between Episodes to scroll through
the options. The range is 30 to 300 seconds in increments of 15 seconds.
Setting Heart Rate Cutoff on ST Analysis
Since the accuracy of ST readings diminishes as the patient’s heart rate increases, you
may wish to stop ST analysis at a pre-determined heart rate. To set a cutoff for ST analy-
sis:
1. Press ST Config on the Patient Settings screen.
2. Press the ST Alarm button.
3. Use the arrow buttons under HR Cutoff to select a cutoff heart rate from 20 to
300 beats per minute, in increments of 10, for all leads.
ST analysis stops when the patient heart rate reaches this value and a flashing red
“Heart Rate Over HR Cutoff” appears in the ST Analysis screen.
4. If you do not wish to set a limit, select Off. ST analysis is then performed
regardless of patient heart rate.