Patient Monitor User Manual Monitoring ECG
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The measurement function provides the automatic measurement of the common parameters, such
as heart rate, PR interval, QRS duration, QT/QTC interval, P/QRS/T axis, RV5/SV1 amplitude
and RV5+SV1 amplitude. The interpretation function provides the automatic analysis of
hundreds of abnormal cases, such as arrhythmia, AV block, IVCD (Intraventricular Conduction
Block), myocardial infarction, ventricular hypertrophy and atrial enlargement, ST-T abnormality
and electrical axis deviation.
8.7.3 Waveform Durations and Isoelectric Segments
Between the global onset and offset of the QRS-complex, signal parts with duration of more than
6 ms and amplitude not exceeding 20 μV should be defined as isoelectric segments.
Because the duration of the Q-, R- or S-wave of 12 leads is respectively detected by the ECG
algorithm, isoelectric parts (I-waves) after global QRS-onset or before global QRS-offset
(K-wave) are excluded in the measurement duration of the respective adjacent waveform.
QRS Duration = Rd+Sd+R’d
I
K
R Duration
Q Duration
R Duration S Duration
R
R’
S
V1
V3
V5
8.8 ST Segment Monitoring
The monitor performs ST segment analysis on normal and atrial paced beats and calculates ST
segment elevations and depressions. This information can be displayed in the form of ST
numerics and ST templates on the monitor.
ST segment monitoring function is shut off by default. You can switch it to On when necessary.
When using the ST analysis function, the ST analysis results will be displayed on the right of the
main screen.
NOTE:
1 ST-segment analysis is intended for use with adult and pediatric patients and is not
clinically validated for use with neonatal patients.
2 In ST analysis, the obtained ST value and ST template are all unaffected by the
selected filter mode. ST algorithm itself uses a dedicated linear filter to ensure the
signal is not distorted, and to better ensure the consistent and accurate
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