ECG Signal Analysis - ECG Acquisition and Automated Remote Processing - page 31

Fig. 2.8 R-peak detection from using squared derivative ECG. a using ptb-db data(MI-anterior),
b using ptb-db data(MI-inferior)
2.4.1.3 Using Amplitude Span Detection of QRS Region
In this technique, the QRS detection is based on the following features in a typical
ECG dataset.
1. The QRS segment width is nominally 96 ms, within which, Q (or S) peak to R
peak maximum distance is 60 ms;
2. Slope change in the QRS region is the maximum;
3. For a particular lead, the QRS amplitude span, defined as the vertical distance
between R-peak ordinate to the same of Q peak (or S peak), remains almost
constant throughout the dataset.
A sliding window of 96-ms width is moved by 20 ms in steps through the entire
dataset to form a rule base which is used for detecting the QRS templates. Thus,
the total process is divided into two stages, viz., rule-base generation and QRS