Results 231 to 240 of about 1,026,837 (287)

Total respiratory impedance in healthy children

Pediatric Pulmonology, 1985
AbstractImpedance of the total respiratory system was measured in 121 healthy children aged 4–16 years during spontaneous breathing by pseudo‐random forced oscillations between 3 and 10 Hz. Total respiratory resistance (Rrs), inertance (Irs) and compliance (Crs) were determined by least‐mean‐squares fitting.
Z Hantos
exaly   +3 more sources

Parametric models for characterizing respiratory input impedance

Journal of Medical Engineering and Technology, 2008
This study compares a manifold of parametric models reported in the literature with two novel parametric models for identifying human input respiratory impedance. The analysis is carried out on typical patient data obtained with the forced oscillations technique (FOT), on three sets of representative diagnosed subjects: healthy, asthma and COPD.
Clara Ionescu
exaly   +3 more sources

Direct readout of respiratory impedance

Medical & Biological Engineering, 1976
Because the technique of forced oscillations requires little co-operation from the patient it is frequently employed in the diagnosis and treatment of respiratory diseases. To make routine use of this method possible, by medical researchers as well as clinicians, a special-purpose computer has been developed to determine those parameters of interest ...
A J, Ross, M B, Raber, B W, Kirk, D H, Goldstein   +3 more
openaire   +2 more sources

Measurement of Low-Frequency Respiratory Impedance in Infants [PDF]

American journal of respiratory and critical care medicine, 1996
Abstract Low-frequency respiratory impedance (Zrs) data permit the separate estimation of the mechanical properties of the airways and the tissues, but they are difficult to collect in humans because of the need for apneic conditions.
Sly Peter D., Hayden Mark J., Peták Ferenc, Hantos Zoltán   +3 more
openaire   +5 more sources

Volume Dependence of Respiratory Impedance in Infants

American Journal of Respiratory and Critical Care Medicine, 1997
Abstract We previously studied low-frequency respiratory impedance (Zrs) data at an elevated lung volume to separate airway and tissue mechanical properties in normal infants (Am. J. 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 ...
Petak, F., Hayden, M.J., Hantos, Z., Sly, P.D.   +3 more
openaire   +5 more sources

Modelling respiratory impedance in patients with kyphoscoliosis

Biomedical Signal Processing and Control, 2014
Abstract When a nonlinear biological system is under analysis, one may employ linear and nonlinear tools. Linear tools such as fractional order lumped impedance models have not been previously employed to characterize difference between healthy volunteers and patients diagnosed with kyphoscoliosis (KS).
Clara M. Ionescu, Eric Derom, Robin De Keyser   +2 more
openaire   +2 more sources

Respiratory monitoring with a new impedance plethysmograph

Anaesthesia, 1986
Summary A new impedance plethymograph respiratory monitor, (AR‐8800). was tested on anaesthetised dogs. Decreases in tidal volume and total apnoea were brought about by partial and complete airway obstruction and by partial and total muscle paralysis.
S, Hoffman, R, Jedeikin, D, Atlas
openaire   +2 more sources

Respiratory mechanical impedances. Methodology and interpretation

Biorheology, 1984
A synthetic approach to lung and chest mechanics is to apply pressure variations to the respiratory system over a range of frequencies and to study the amplitude and phase relationships between applied pressure and resulting gas or tissue flow. Such impedance measurements may be performed in different ways, which are not equivalent: the most usual are ...
R, Peslin, C, Duvivier, B, Hannhart
openaire   +2 more sources

Cancellation of Respiratory Artifact in Impedance Cardiography

2005 IEEE Engineering in Medicine and Biology 27th Annual Conference, 2005
Impedance 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
openaire   +2 more sources

Total respiratory impedance and early emphysema

European Respiratory Journal, 1993
It can be postulated that patients in early stages of pulmonary emphysema have normal values of total respiratory resistance and reactance. The purpose of this study was to investigate whether pulmonary emphysema, detected functionally by a decrease of the single breath diffusing capacity (DLCO) by at least 25% of predicted, and an increase of the ...
E, Govaerts, M, Demedts, K P, Van de Woestijne   +2 more
openaire   +2 more sources