The ST measurement for each beat complex is the vertical difference between
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.
ST analysis analyzes ECG signals to classify the heart beats. Only beats
classified as normal or Supraventricular (atrially paced) are used to
calculate ST elevations and depressions.
The ST/AR ST Analysis 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:
3-wire: one lead
5-wire: up to two leads if monitoring a chest and a limb lead
5-wire: up to six leads if monitoring two limb leads
5-wire: up to 12 leads if monitoring using EASI
6-wire: up to 8 leads if monitoring two limb leads and two chest leads
Note—No ST analysis is done on a patient if an electrode falls off.
ECG and Arrhythmia Monitoring