QRS detection


#1

There are 4 main problems in detecting the QRS complex in ECG traces:

Artefacts due to electrode motion

Artefacts%20due%20to%20electrode%20motion

There are 4 main problems in detecting the QRS complex in ECG traces:

  1. Artefacts due to electrode motion
  2. Baseline wander (mostly caused by breathing and torso movements)
  3. Muscle artefact (broadband)
  4. T-waves with high-amplitude content.

The solution to these problems is to use a bandpass filter to remove:

 Low-frequency changes such as baseline wander

 High-frequency changes e.g. movement/muscle artefact

Most of the frequencies in the QRS complex are around 5-20 Hz

QRS%20detection

Once the “non-QRS” sections of the ECG have been attenuated, the QRS complex can be detected with a threshold detector.