GE CARESCAPE, User Manual

Page: 182 / 548

ECG
Problem Solution
●
The SpO
2
parameter if available does not indicate
beat detections in the previous 30 seconds.
Why is the monitor calling V Tach when the patient is
not in V Tach? The monitoring system may be detecting a wider
QRS complex or artifact in some of the analyzed ECG
waveforms. In addition, the V leads may be exhibiting
polarity changes, which may occasionally cause an
inaccurate call.
1. Assess the patient.
2. Check the ECG signal acquired from the patient.
●
View all ECG leads to assess the width of the
QRS complexes in the analyzed leads.
●
If artifact exists in any of the analyzed leads,
reprep the patient’s skin, replace electrodes,
and adjust the electrode placement.
●
It may be beneficial to move V lead electrodes
(chest lead) to alternate precordial electrode
placements to improve detection.
3. Relearn arrhythmia. It is important to relearn
the patient’s ECG pattern any time the electrode
configuration is adjusted.
If the problem continues, determine the lead with
the narrowest QRS complex, display that lead, then
switch to single lead analysis so all arrhythmia
interpretations are based on this single ECG lead.
ST detection
About the ST analysis
NOTE
Multi-lead ST Analysis license only.
If enabled, ST analysis starts automatically after the ECG leads have been connected
and QRS detection has started. The message
Learning displays within each QRS
complex window. Once the program has completed the learning phase, ST values are
updated every 10 seconds, QRS complexes every 40 seconds.
ST detection with PDM and E-modules
During the learning period, the algorithm uses the isoelectric reference and the J+
reference points to calculate the ST values. The algorithm automatically searches for
the J and ISO points. These settings can be adjusted for the current patient.
ST detection with TRAM
During the learning period, the algorithm uses the isoelectric reference and the
J+ reference points to calculate the ST values. Once the learning is complete, the
dominant QRS complex becomes the template for ST segment analysis. The algorithm
uses continuous correlation and incremental template updating. Continuous
correlation attempts to find the best match between each incoming complex and the
182 CARESCAPE Modular Monitors 2062971-001