Physio Control LIFEPAK 15, Руководство по эксплуатации

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Vital Sign and ST Segment Trends
110
LIFEPAK 15 Monitor/Defibrillator Operating Instructions
Interpreting the ST Trend Graph
Using the first 12-lead ECG, the monitor identifies the presence of any STJ displacement, either
negative or positive, and the lead that has the most STJ displacement. When
AUTO
is selected,
the lead that has the most STJ displacement is shown on the graph. The STJ is measured
every 30 seconds thereafter.
The following figure shows an example of an ST trend graph. The elapsed time goes from right
to left across the screen. The most current STJ measurement is on the far right. Each time an
STJ measurement is obtained, it is compared to the first STJ or baseline measurement. The bars
represent the change in the STJ compared to the first measurement.
Figure 32 ST Trend Graph
FIGURE LEGEND
1 Increase and then decrease in STJ
2 Lead
3 Change in STJ
4 Current STJ
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.