Results 251 to 260 of about 1,026,837 (287)
Some of the next articles are maybe not open access.
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.
openaire +1 more source
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.
openaire +1 more source
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
openaire +2 more sources
An improved forced oscillatory estimation of respiratory impedance
International Journal of Bio-Medical Computing, 1982A new scheme of estimation is proposed for the determination of the total respiratory impedance (Zr) by forced oscillations. Instead of estimating Zr from the airflow at the mouth and the pressure drop across the respiratory system, Zr can be estimated from cross-power spectra between the electrical signal of the driving apparatus and the measured ...
B, Daróczy, Z, Hantos
openaire +2 more sources
Effects of respiratory gas composition on transthoracic impedance
Resuscitation, 1998The transthoracic current generated during defibrillation comprises a cardiac and extracardiac component. Changes in impedance of transthoracic pathways will alter the transmyocardial current and may thus affect the outcome from defibrillation. The lungs comprise a large component of extracardiac tissue but the effects of different respiratory gases on
Deakin, C.D. +5 more
openaire +3 more sources
Respiratory input impedance in anesthetized paralyzed patients
Journal of Applied Physiology, 1990Respiratory impedance (Zrs) was measured between 0.25 and 32 Hz in seven anesthetized and paralyzed patients by applying forced oscillation of low amplitude at the inlet of the endotracheal tube. Effective respiratory resistance (Rrs; in cmH2O.l-1.s) fell sharply from 6.2 +/- 2.1 (SD) at 0.25 Hz to 2.3 +/- 0.6 at 2 Hz.
D, Navajas +4 more
openaire +2 more sources
Measurement of Respiratory System Impedances
2002Forced oscillation technique (FOT) is a simple and minimally invasive method used to study the mechanical properties of the respiratory system by measuring its response to an externally applied forcing signal (see chapters 12 and 29). This mechanical response is studied by means of the impedance, defined as the complex ratio between the applied ...
openaire +3 more sources
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
openaire +2 more sources
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 ...
Depeursinge FB +3 more
openaire +3 more sources
Frequency dependence and partitioning of respiratory impedance in dogs
Journal of Applied Physiology, 1981Total pulmonary resistance (Rt) and reactance (Xt) from 1 to 30 Hz were determined by time series analysis in open-chest vagotomized dogs. Rt and Xt were partitioned by retrograde catheter into central airway resistance (Rc) and reactance (Xc) and peripheral resistance (Rp) and reactance (Xp). Rt, Rc, or Rp did not change with transpulmonary pressure (
A D, Kappos, J R, Rodarte, S J, Lai-Fook
openaire +2 more sources
Analysis of Respiratory Impedance Characteristics in Chronic Bronchitis
Respiration, 2009Impedance measurements of the respiratory system were performed by means of the technique of forced oscillations to study the mechanical characteristics of the respiratory system in 33 patients with chronic bronchitis without spirometric evidence of airway obstruction (FEV<sub>1</sub>≥70% predicted).
G J, Wesseling, E F, Wouters
openaire +2 more sources