Analysis of breathing disturbances for the estimation of respiratory impedance

Hannes Maes, Gerd Vandersteen

Research output: Unpublished contribution to conferencePoster


Measurement of the respiratory impedance of a patient is a clinically practical method for the monitoring of lung pathologies. The respiratory impedance is defined as a complex ratio of pressure and flow signals measured at the mouth of the patient. During the measurement, the pressure signal is controlled to excite frequencies starting from the range of spontaneous breathing (0.1-1 Hz) up to 5 Hz. The resulting flow signal consists of a combination of a response to the excited frequency lines and spontaneous breathing disturbances. Since the spontaneous breathing disturbances have a higher amplitude in the low frequency range (0.1-1 Hz), separation techniques are needed to distinguish response to the excitation and breathing disturbances. The main difficulty during the separation stems from the variation of the breathing signals during the measurement. Both amplitude and fundamental frequency can show large and unpredictable changes during the measurement. Therefore, a combination of regularized least square estimators and random walk techniques is proposed in order to obtain estimates for the respiratory impedance.
Original languageEnglish
Publication statusPublished - 21 Sep 2014
EventERNSI 2014 - Thermae Palace Hotel, Ostend, Belgium
Duration: 21 Sep 201424 Sep 2014


WorkshopERNSI 2014
OtherModelling of dynamical systems is fundamental in almost all disciplines of science and engineering, ranging from life science to plant-wide process control. Engineering uses models for the design and analysis of complex technical systems. System identification concerns the construction, estimation and validation of mathematical models of dynamical physical or engineering phenomena from experimental data. This is the 23rd version of the European Workshop on System Identification, the first one being held in Saint-Malo in 1992. All through these years the workshop has maintained the scope of bringing together European researchers in the area of System Identification, in an informal setting that gives ample opportunities for participants to meet. The workshop program is composed of lectures from invited speakers, lectures from members of the ERNSI community, and poster presentations by -particularly- the PhD students and postdocs that are active in the network.


  • respiratory impedance
  • lung pathologies
  • regularized least square estimators


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  • ERNSI 2014

    Hannes Maes (Speaker)

    21 Sep 201424 Sep 2014

    Activity: Talk or presentationTalk or presentation at a workshop/seminar

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