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QRS waveform group: it indicates the changes of potential and time during ventricular
muscle depolarization. R wave is high and narrow without notch, and its segments are
completely above or below the base point.
S-T segment: a horizontal line from the end point of QRS wave group (J point) to the start
point of T wave is called S-T segment. Down deviation of any normal lead’s S-T segment
should not exceed 0.05mV. When S-T segment’s down deviation exceeds the standard
range, it is common in myocardial ischemia or strain. Normally, if S-T segment deviates
upwards, limb lead and precordia leads of V4-6 should not exceed 0.1mV and precordia
leads of V1-3 should not exceed 0.3mV. When S-T segment’s up deviation exceeds the
standard range, it is common in acute myocardial infarction or pericarditis.
T wave is of blunt round shape. Its amplitude is lower than 1/3 of R wave’s. But it takes
longer time. The direction of T wave is usually the same as that of the main wave of QRS
wave group. Ⅰ,Ⅱ, V4-6 leads are upright while aVR is upside down. Other leads can be
upright, bidirectional or upside down. If V1 is upright, V3 could not be upside down. In the
leads of QRS wave group whose main wave is up, when T wave is low and smooth or
upside down, it is common in myocardial ischemia or hypokalemia.
Here is a simple description of ECG waveforms. For details, please see
relevant references.
6.3 Report Storage
6.3.1 Report Storage Location
Configure the report storage location in [Application] → [General] → [Report Setting] with
options such as Local/SD card/USB.
Local: When sampling time is 10s, and layout is 3×4, you can store no less than
1500 reports.
When sampling time is 2.5s, and layout is 3×4, you can store no less than
2000 reports.
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