Physio Control LIFEPAK 15, Operating Instructions Manual

Page: 109 / 284

Chapter 4 | Monitoring
©2007-2015 Physio-Control, Inc. LIFEPAK 15 Monitor/Defibrillator Operating Instructions
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Figure 30 Pressure Trend Graph
FIGURE LEGEND
1 Systole pressure
2 Diastolic pressure
3 VS label
How ST Trends Work
ST measurements can be displayed graphically for time ranges of 30 minutes, and 1, 2, 4,
and 8 hours. ST trending is initiated by obtaining the patient’s first 12-lead ECG. The ST J-point
(STJ) is the part of the ST segment that is measured (see the following figure). The STJ
measurement is plotted on the ST trend graph (see Figure, ST Trend Graph (on page 110)).
Figure 31 STJ Measurement
When all leads of the 12-lead ECG cable are attached to the patient, STJ measurements are
obtained automatically every 30 seconds. If a lead is off, or the ECG data is too noisy, ST
measurements are not obtained and the graph shows a blank for that time period. If an STJ
measurement in any lead deviates from the initial measurement by 1 mm (0.1 mV) or more and
the deviation persists for 2.5 minutes, the monitor automatically prints another 12-lead ECG.
Manual requests for 12-lead ECGs do not affect ST trending or automatic printing.