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Page 10-2 Infinity Gamma Series VF4

Overview

The monitor provides an option for ST segment analysis, avail-

able for the adult and pediatric monitoring modes. When acti-

vated, this option analyzes the patient’s normal QRS pattern and

determines values for ST segment deviation (i.e., how far the ST

segment of the QRS complex is above or below the isoelectric

line). ST segment analysis is performed on the two leads selected

for ECG monitoring. The default leads for ST analysis are lead II

and V (with a 5- or 6-lead cable), the same default leads assigned

for Arrhythmia monitoring. Upper and lower limits are user-

selectable and the monitor triggers an alarm in case of limit viola-

tion.

When you connect the monitor to a patient, the monitor begins

the process of learning the patient’s dominant ECG beat pattern:

this pattern serves as a baseline for determining subsequent nor-

mal beats. The monitor stores an average ST complex that is

derived from those beats classified as normal. In order to obtain

an ST segment deviation value, the monitor then compares the

isoelectric and the ST segment level of the average complex. The

ST segment deviation represents the difference in voltage

between the isoelectric and the ST segment level of the average

complex. The monitor displays the ST segment deviation in the

ST parameter box. The value is updated every 15 seconds.

NOTES:

! You can initiate a Relearn of the ECG reference pattern manu-

ally at any time (see the chapter Arrhythmia).

! ST deviation values are displayed in mm (default) or mV.

Changing the units of measurement is a password-protected

function. For information, contact your Biomedical personnel.

! In OR mode (see the chapter Multigas), the ST parameter box

is not displayed and deviations in the ST segment are neither

monitored nor trended.

WARNIN G: The ST algorithm has been tested for the

accuracy of detecting ST segment deviations. The signif-

icance of the ST segment deviations must be determined

by a clinician.

Dräger Infinity Series User Manual

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