User's Manual

10-11
ST Analysis Troubleshooting Guide
Clinical Situation Possible Cause Solution
No access to ST analysis
functions
■ The system must learn the ST
segment level before it can provide
access to ST analysis functions.
■ Wait until the system analyzes
sufficient QRS complexes to
calculate the ST segment level
(approximately one minute).
ST = ?? is displayed ■ Infrequent occurrence of dominant
beats.
■ ST analysis not performed on paced,
premature dominant or abnormal
beats.
■ ECG amplitude may be insufficient
to detect QRS complexes.
■ Check QRS amplitude.