scholarly journals Fractional-Order Models for the Input Impedance of the Respiratory System

10.5772/7472 ◽  
2009 ◽  
Author(s):  
Clara Ionescu ◽  
Robin De ◽  
Kristine Desager ◽  
Eric Derom
Keyword(s):  
Fractional Order ◽  
Respiratory System ◽  
Input Impedance

Determinants of respiratory system input impedance and bronchodilator response in healthy Finnish preschool children

2002 ◽  
Vol 22 (1) ◽  
pp. 64-71
Author(s):  
L. P. Malmberg ◽  
A. Pelkonen ◽  
T. Poussa ◽  
A. Pohjanpalo ◽  
T. Haahtela ◽  
...  
Keyword(s):  
Preschool Children ◽  
Respiratory System ◽  
Input Impedance ◽  
Bronchodilator Response ◽  
System Input

Simulation of Respiratory System for Identifying Airway Occlusion

2000 ◽  
Author(s):  
A. M. Al-Jumaily ◽  
P. Mithraratne
Keyword(s):  
Theoretical Model ◽  
Acoustic Wave ◽  
Dynamic Response ◽  
Respiratory System ◽  
Input Impedance ◽  
Symmetric Model ◽  
Airway Occlusion ◽  
Wave Approach ◽  
Model Based ◽  
Compliant Walls

Abstract A theoretical model is developed to study the dynamic response of the respiratory system using Weibel symmetric model based on the acoustic wave approach. Both rigid and compliant walls with rigid and compliant termination are investigated separately. For each case the response (normalised input impedance against prorogation frequency) is examined for occlusion at each generation from alveolar sacs up to the distal end of the trachea systematically.

Determinants of respiratory system input impedance and bronchodilator response in healthy Finnish preschool children

2002 ◽  
Vol 22 (1) ◽  
pp. 64-71 ◽  
Author(s):  
L. P. Malmberg ◽  
A. Pelkonen ◽  
T. Poussa ◽  
A. Pohjanpalo ◽  
T. Haahtela ◽  
...  
Keyword(s):  
Preschool Children ◽  
Respiratory System ◽  
Input Impedance ◽  
Bronchodilator Response ◽  
System Input

scholarly journals Effect of expiratory flow limitation on respiratory mechanical impedance: a model study

1996 ◽  
Vol 81 (6) ◽  
pp. 2399-2406 ◽  
Author(s):  
R. Peslin ◽  
R. Farré ◽  
M. Rotger ◽  
D. Navajas
Keyword(s):  
Respiratory System ◽  
Input Impedance ◽  
Wave Speed ◽  
Mechanical Impedance ◽  
Flow Limitation ◽  
Maximal Flow ◽  
Expiratory Flow Limitation ◽  
Rubber Tubing ◽  
Model Study ◽  
Expiratory Flow

Peslin, R., R. Farré, M. Rotger, and D. Navajas.Effect of expiratory flow limitation on respiratory mechanical impedance: a model study. J. Appl. Physiol. 81(6): 2399–2406, 1996.—Large phasic variations of respiratory mechanical impedance (Zrs) have been observed during induced expiratory flow limitation (EFL) (M. Vassiliou, R. Peslin, C. Saunier, and C. Duvivier. Eur. Respir. J. 9: 779–786, 1996). To clarify the meaning of Zrs during EFL, we have measured from 5 to 30 Hz the input impedance (Zin) of mechanical analogues of the respiratory system, including flow-limiting elements (FLE) made of easily collapsible rubber tubing. The pressures upstream (Pus) and downstream (Pds) from the FLE were controlled and systematically varied. Maximal flow (V˙max) increased linearly with Pus, was close to the value predicted from wave-speed theory, and was obtained for Pus-Pds of 4–6 hPa. The real part of Zin started increasing abruptly with flow (V˙) >85%V˙max and either further increased or suddenly decreased in the vicinity of V˙max. The imaginary part of Zin decreased markedly and suddenly above 95%V˙max. Similar variations of Zin during EFL were seen with an analogue that mimicked the changes of airway transmural pressure during breathing. After pressure andV˙ measurements upstream and downstream from the FLE were combined, the latter was analyzed in terms of a serial (Zs) and a shunt (Zp) compartment. Zs was consistent with a large resistance and inertance, and Zp with a mainly elastic element having an elastance close to that of the tube walls. We conclude that Zrs data during EFL mainly reflect the properties of the FLE.

Measuring the mechanical input impedance of the respiratory system with breath-driven flow oscillations

2021 ◽  
Vol 130 (4) ◽  
pp. 1064-1071
Author(s):  
Gregory S. Roy ◽  
Nirav Daphtary ◽  
Olivia Johnson ◽  
Anne E. Dixon ◽  
David A. Kaminsky ◽  
...  
Keyword(s):  
Respiratory System ◽  
Diagnostic Tool ◽  
Input Impedance ◽  
Power Supplies ◽  
Respiratory Flow ◽  
Clinical Diagnostic ◽  
Mouth Pressure ◽  
Flow Oscillations

The technique of oscillometry for measuring the mechanical input impedance of the respiratory system is gaining traction as a clinical diagnostic tool, but the portability of existing commercially available devices is limited by the size and weight of oscillator motors and power supplies. We show that impedance can be measured by oscillations in mouth pressure and flow generated by mucus-clearing devices that are powered by the subject’s own respiratory flow. This principle might thus be employed in lightweight ambulatory oscillometry devices.

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