Physio-Control LIFEPAK 15 - Manual (Page 113)

MONITORING
4
©2007-2013 Physio-Control, Inc. LIFEPAK 15 Monitor/Defibrillator Operating Instructions
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Figure 4-18 ST Trend Graph
This ST trend graph depicts the changes in STJ from a patient’s first 12-lead ECG over 10 minutes
of monitoring time. The patient’s initial ECG showed no ST elevation in any lead. Then the patient
developed 3 mm elevation in Lead II. This change in ST elevation is represented by the vertical bars
and lasted approximately 5 minutes. (Each vertical bar represents a 30-second interval). After
treatment was initiated, the ST decreased to the current STJ measurement of 1.0, but is still
positive compared to the initial ECG.
The annotation (1.0/1.0) means that the current STJ measurement is elevated 1.0 mm and
represents a change of 1.0 mm from the initial ECG. To confirm the value of the initial 12-lead ECG
STJ measurement, subtract the STJ change from the current STJ measurement, for example,
1.0 – 1.0 = 0. You can display the ST graph of other leads.
Current
STJ
Change in
STJ
Lead
Increase and then
decrease in STJ