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Respiratory Acoustic Impedance in Left Ventricular Failure
Chest, 1989The measurement of respiratory acoustic impedance (Zrs) by forced pseudorandom noise provides a simple means of assessing respiratory mechanics in nonintubated intensive care patients. To characterize the lung mechanical alterations induced by acute vascular congestion of the lung, Zrs was measured in 14 spontaneously breathing patients hospitalized ...
F B, Depeursinge +3 more
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Volume Dependence of Respiratory Impedance in Infants
American Journal of Respiratory and Critical Care Medicine, 1997We previously studied low-frequency respiratory impedance (Zrs) data at an elevated lung volume to separate airway and tissue mechanical properties in normal infants (Am. I. Respir. Crit. Care Med. 1996; 154:161-166). The aim of the present study was to determine the volume dependence of the airway and tissue mechanics by extending Zrs measurements to ...
Petak, F. +3 more
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Cancellation of Respiratory Artifact in Impedance Cardiography
2005 IEEE Engineering in Medicine and Biology 27th Annual Conference, 2005Impedance cardiography is a noninvasive technique for monitoring stroke volume, based on sensing variation in the thoracic impedance, z(t), due to blood flow. In this technique, first derivative of impedance, dz/dt, is used to calculate two parameters: ventricular ejection time and (-dz/dt)max.Respiration and motion artifacts cause base line drift in ...
Vinod, Pandey, Prem, Pandey
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Effect of body posture on respiratory impedance
Journal of Applied Physiology, 1988The effects of posture on the mechanics of the respiratory system are not well known, particularly in terms of total respiratory resistance. We have measured respiratory impedance (Zrs) by the forced random noise excitation technique in the sitting and the supine position in 24 healthy subjects. Spirometry and lung volumes (He-dilution technique) were
D, Navajas +4 more
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Serum Impedance in Children with Recurrent Respiratory Infections
2022The role of disturbed immunoglobulin content during recurrent respiratory tract infections (RTI) might escape recognition in practical children's diagnostics. This study aims to investigate the potential changes in serum impedance caused by a constellation of decreases in the immunoglobulin IgA, IgG, and IgM content in RTI.
Gerard Pasternak +4 more
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Characteristics of a simple measure of respiratory impedance
Respiration Physiology, 1987The ratio of mouth pressure developed 0.1 sec after occlusion at end-expiration (P0.1) to average inspiratory flow rate (VT/TI) has been proposed as 'effective inspiratory impedance', Imeff. We have studied a simple mathematical model of lung mechanics, consisting of an effective resistance, an effective compliance and a single pressure generator, to ...
W E, Fordyce, R M, Whetstone
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Interpretation of respiratory input impedance in healthy infants
Pediatric Pulmonology, 1996Respiratory input impedance (Zin) is a potentially informative test of pulmonary function in infants who are unable to perform standard tests commonly performed in children and adults Analysis of Zin in dogs using the six-element model of DuBois et al. (J Appl Physiol 8:587, 1956) provides estimates of airways resistance separate from tissue resistance,
A C, Jackson +3 more
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Respiratory impedance in patients with Duchenne muscular dystrophy
Pediatric Pulmonology, 2016SummaryImpulse oscillometry (IOS) evaluates non‐effort‐dependent respiratory mechanics, and thus it may be useful to evaluate patients with Duchenne muscular dystrophy (DMD). Objectives: We aimed (1) to describe the behavior of IOS parameters in patients with DMD, and compare it to those from a control group; (2) to determine whether resistances and ...
Laura, Gochicoa-Rangel +6 more
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2013
This chapter treats the basic principles of estimating the respiratory impedance from measurements performed with the forced oscillation lung function test. First, the non-parametric identification of the respiratory impedance is presented by means of spectral analysis.
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This chapter treats the basic principles of estimating the respiratory impedance from measurements performed with the forced oscillation lung function test. First, the non-parametric identification of the respiratory impedance is presented by means of spectral analysis.
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Low-frequency respiratory mechanical impedance in the rat
Journal of Applied Physiology, 1987modified forced oscillatory technique was used to determine the respiratory mechanical impedances in anesthetized, paralyzed rats between 0.25 and 10 Hz. From the total respiratory (Zrs) and pulmonary impedance (ZL), measured with pseudorandom oscillations applied at the airway opening before and after thoracotomy, respectively, the chest wall ...
Hantos Zoltán +3 more
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