10-2 DELTA/DELTA XL/KAPPA VF8
10 ST M
ONITORING
Overview
ST segment deviation is defined as the displacement (in mm) above or below the
isoelectric level. The measurement of deviation compares the isoelectric point to the
ST measurement point.
The isoelectric point defines the point of zero voltage (no electrical activity, 0 mm)
with a default position of 28 ms before the onset of the QRS complex on the
horizontal (time) axis. The ST point occurs in the ST segment between the QRS offset
(J point) and the T-wave, at a default position of 80 ms after the QRS offset. The
following figure illustrates a typical QRS complex.
The ST analysis feature examines QRS complexes classified as “normal” beats from
up to twelve selected ECG leads. The monitor learns each ST lead, combining the
measurements and features of normal beats into a composite (or average) QRS
complex. It derives the ST segment deviation from this average.
When ST monitoring is enabled, current ST values are trended and can be reviewed on
the trend display.
1
Isoelectric point
(Default = 28 ms before QRS onset)
5
ST deviation
2
QRS onset
6
ST measurement point
(Default = 80 ms after QRS offset)
3
Fiducial point
7
Isoelectric level
4
QRS offset
8
ST level
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