Setting The St Measurement Points - GE Healthcare B30 User's Reference Manual

B30 Patient Monitor

Setting the ST measurement points

Automatic setting of the J, ST and ISO points
The ST algorithm automatically searches for the J and ISO points. The distance between the ST
and J point is set according to the heart rate:
−
If the heart rate is less than 120 bpm, the ST point is set at J+80 ms.
−
If the heart rate is more than 120 bpm, the ST point is set at J+60 ms.
Setting the J, ST and ISO points manually
You can also set the J, ST and ISO points manually. If any of these points is manually set, the
other two are set at their current values.
Select Adjust ST and Set ISO point, Set J point or ST point.
•
Setting the J point manually
The J point is the point on the ECG trace where the S wave transitions to the ST segment.
Adjust the J point by turning the ComWheel and confirm by pushing the ComWheel. If the
J point setting is changed, the original point is shown as a dashed line. When you adjust
the J point, also the ST point is set according to the selected ST point setting (J+20, J+40,
J+60 or J+80).
The manually set J point remains until the monitor is turned off or reset. After a turn-off or
reset, the J point is set automatically.
•
Setting the ST point manually
ST segment is the component of the ECG trace between the end of the QRS complex and
the T wave.
Manual ST point adjustment sets the distance between ST and J points in ms. Selection
values are J+20, J+40, J+60, J+80.
The manually set ST point remains until the monitor is turned off or reset. After a turn-off
or reset, the ST point is set automatically according to the heart rate.
•
Setting the ISO point manually
The ISO point is on the isoelectric line. Adjust the ISO point by turning the ComWheel and
confirm by pushing the ComWheel. If the ISO point setting is changed, the original point is
shown as a dashed line.
The manually set ISO point remains until the monitor is turned off or reset. After a turn-off
or reset, the ISO point is set automatically.
11-12
R
J
P
Q
S
Q-T interval
P-R interval
T
U