Project Description

Cardiovascular wave analysis module

Electrocardiogram, ecg background

Challenge

Electrocardiography (ECG) is the process of recording the electrical activity of the heart over a period of time using electrodes placed on a patient’s body. These electrodes detect the tiny electrical changes on the skin that arise from the heart muscle depolarizing during each heartbeat.

This application is performing in 3 operations:

  • Data acquisition
  • Pre-processing
  • Detection and Analysis

Solution

The Scilab module for cardiovascular wave analysis is a collection of more than 90 functions for reading, visualizing and analysis of cardiovascular wave such as multi derivation ECG, blood pressure, breathing…

Data acquisition

medical_ecg_acquisition

Several input data formats, the large files generated by long duration records such as those given by the cardiac holter devices can be managed.

Pre-processing

medical_ecg_detection

In addition to the basic Scilab signal processing tools, specific functions are provided for the signal pretreatment like 50Hz removal, ECG baseline wander removal, sub-sampling, etc.

Detection and Analysis

medical_ecg_pretreatment

Powerful detection algorithms which allow localization of QRS complex events like the Q, R, S, T peaks, as well as the beginning and the end of the waves are provided. The duration, amplitude, and morphology of the QRS complex are useful for the diagnosis of many cardiac disease states.

Algorithms based on complex demodulation, time frequency analysis or multi-channel non-stationary signal analysis are provided for analysing the behaviour of the baroreflex mechanism from the RR variations with respect to various signals like the systolic or diastolic blood pressure, the tidal volume respiratory. The baroreflex mechanisms driven by the autonomic nervous system provides a rapid feedback loop which aims to regulate the blood pressure.

A set of specific functions is provided for the visualization of the ECG and the location of the QRS events with interactive capabilities for long signals.

Results

medical_app_inria

This application based on Scilab was developed by Serge Steer, from INRIA, the grand-father of Scilab. It has been presented at ScilabTec 2015.

Keywords

Biomedical, cardiovascular, ECG, detection, baroreflex

References

[1] Rapport de recherche INRIA RR-4427:Short term control of the cardiovascular system: modelling and signal analysis, Alessandro Monti, Claire Médigue, Michel Sorine,2002

[2] Q. Zhang, A. Illanes Manriquez, C. Médigue, Y. Papelier, and M.Sorine. An algorithm for robust and efficient location of T-wave ends in electrocardiograms. IEEE Trans. on Biomedical Engineering, 53(12):2544-2552, 2006.

[3] Instantaneous parameter estimation in cardiovascular time series by harmonic and time-frequency analysis, Alessandro Monti , Claire Médigue , Mangin Laurence, IEEE Trans Biomed Eng. 2002 Dec;49(12 Pt 2):1547-56.