ST/AR ST Segment Algorithm
The
The ST measurement for each beat complex is the vertical difference between
Measurement
two measurement points. The isoelectric point provides the baseline for the
measurement and the ST point provides the other measurement point. It is
positioned with reference to the J-point.
Algorithm
ST analysis analyzes ECG signals to classify the heart beats. Only beats
Processing
classified as normal or Supraventricular (atrially paced) are used to calculate ST
elevations and depressions.
The ST/AR ST algorithm processing includes special ST filtering, beat selection
and statistical analysis, calculation of ST segment elevations and depressions,
and lead reconstruction and wave generation.
When ST analysis is being performed on two leads, the averaged derived and
reconstructed ST waves and associated ST segment values are given for up to
six leads, depending on the type of patient cable:
7-8
ST/AR Arrhythmia Monitoring
Draft - 1 Aug 08
•
ST/AR Algorithm - ST Segment Monitoring Application Note,
#452298192851
•
IntelliVue Information Center Instructions for Use and Online Help
R-WAVE PEAK
AT 0 MSEC
P
ISO ELECTRIC
POINT
DEFAULT =
-80 MSEC
•
3-wire: one lead
J POINT
T
Q
S
ST
MEASUREMENT
POINT
DEFAULT =
J+60 MSEC
DIFFERENCE =
ST VALUE