Impedance Plethysmography

HAART Highly-active antiretroviral therapy IPG Impedance plethysmography... 

Nyboer, J. (1972) Workable volume and flow concepts of bio-segments by electrical impedance plethysmography T.-T.-T. 

Breathing patterns Piezoresistive stretch sensors, inductive plethysmography, impedance plethysmography, optical fibres Expansion and contraction of ribcage during breathing Thoracic- abdominal region... 

Geselowitz DB. 1971. An application of electrocardiographic lead theory to impedance plethysmography. IEEE Trans Biomed Eng 18,38-41. 

Impedance plethysmography is closely related to tomography because both are concerned with the recording of local tissue immittivity variations or distributions. Impedance plethysmography is the measurement of immittance changes due to respiration or perfusion and is described in more detail in Section 10.5. 

Figure 7.30(b) shows an electrode with solid contact gel. The gel is sticky and serves both as contact electrolyte and for electrode fixation. For this electrode, EEA = EA. The electrolyte conductivity is rather low because the solution is a gel with low ionic mobility. Electrolyte series resistance may be the dominating factor of electrode/skin impedance at high frequencies. This may introduce problems for use (e.g., for impedance plethysmography around 50 kHz). With this electrode type the skin is not wetted. With such constructions it is... 

ICG is impedance plethysmography based upon the measurement of thoracic electrical bioimpedance. It may also include a component from the resistivity dependence on blood flow (Sigman effect). If so this is not a plethysmographic but a blood velocity component. Usually a measuring frequency of 50—100 kHz has been used. A thoracic electrical bioimpedance measurement picks up both cardiac and respiration signals. The ambition is that the SV [L] and therefore CO [L/min] can be calculated with ICG, as well as the total thoracic fluid volume, for example, according to Eq. 10.1 v = GpL. ... 

Nyboer, J., 1970a. Electrical Impedance Plethysmography. Charles Thomas. 

Schwan, H. P., 1955, Electrical properties of body tissues and impedance plethysmography, Trans. IRE, PGME-3 32-46. 

Geselowitz D. (1971) An Application of Electrocardiographic Lead Theory to Impedance Plethysmography. IEEE Trans Biomed 18 38 1. 

The Respiratory Aetivity (RA) is a very important bio-medieal signal however, it is not eommonly monitored. Through the analysis of RA is possible to detect diverse respiratory pathologies, sueh as asthma, ehronie obstructive pulmonary disease (CORD) and sleep apnea-hypopnea syndrome. Nowadays, different methodologies exist, direct and indirect, to RA measurement. One of the methods is based on the Impedance Pneumography (IP), which is an indirect technique for continuous and dynamic measurement of respiratory volume [1]. The IP is a specialized type of impedance plethysmography (IPG). 

Siegel JH, Fabian M, Lankau C et al. (1970) Clinical and experimental use of thoracic impedance plethysmography in quantifying myocardial contractility. Surgery 67 907-917... 

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