User's Manual

ST/AR ST Segment Algorithm
ST/AR Arrhythmia & ST Segment Monitoring
7-7
ST/AR ST Segment Algorithm
WarningWarning
This device provides ST level change information; the clinical significance
of the ST level change information needs to be determined by a physician.
The ST/AR ST algorithm at the Information Center monitors ST segment
elevation or depression for each available telemetry ECG lead and produces
events/alarms simultaneously. ST values update with every measurement period
and enunciate, depending upon the severity of the change, events and alarms as
they are detected.
The ST/AR ST algorithm is approved for use only with non-paced and atrially-
paced adult telemetry-monitored patients. With EASI monitoring, ST analysis is
performed on up to 12 leads, and an additional value of ST index is calculated
and displayed (see “EASI ST Analysis” on page 7-9). Assessment of EASI-
derived 12-lead ST measurement is recommended for adult patients that meet
the following parameters:
• Ages: 33-82 years
• Heights: 147 to 185 cm (58 to 73 in)
• Weights: 53 to 118 kg (117 to 261 lbs)
• Height to Weight Ratios: 1.41 to 2.99 cm/kg (0.25 to 0.54 in/lb)
All ST analysis and ST alarms for telemetry patients are performed by the
Information Center.
For additional information on ST monitoring, refer to the following
documentation:
• ST/AR Algorithm - ST Segment Monitoring Application Note,
#452298192851
• Information Center Online Instructions for Use and Online Help
The
Measurement
The ST measurement for each beat complex is the vertical difference between
two measurement points. The isoelectric point provides the baseline for the