Saadat Dena 640 User Manual page 26

Lead Placement Diagram
Measurement
The purpose of measurement is ECG signal analysis, detection of onset and offset points of P, QRS ,
T waves and heart axis. They are useful parameters for physician diagnosis to interpret the signal.
ECG parameters including QRS and P waves duration and PR, QT and QTc waves interval are
measured in millisecond. Also Heart Axis is same electrical axes of P, QRS and T waves which can
be calculated. During measurement process, the signal of each 12-lead are analyzed separately.
EGC Parameters
QRS Duration
P/QRS/T Axis
Figure 2-9 Lead placement diagrams
P Duration
PR Interval
QT Interval
QTc Interval
Comment
P-wave Onset to P-wave Offset
Q-wave Onset to S wave Offset
P-wave Onset to Q wave Offset
Q-wave Onset to T wave Offset
Normalized QT based on RR interval
Heart Axis
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