Forced Oscillation Technique
Mostrando 13-24 de 24 artigos, teses e dissertações.
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13. Within-breath analysis of respiratory mechanics in asthmatic patients by forced oscillation
INTRODUCTION: The within-breath analysis of respiratory mechanics by the monofrequency Forced Oscillation Technique (mFOT) is of great interest in both physiopathology studies and the diagnosis of respiratory diseases. However, there are limited data on the use of this technique in the analysis of asthma. This study evaluates within-breath mechanics of asthm
Clinics. Publicado em: 2009
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14. Análise das alterações decorrentes do envelhecimento na mecânica respiratória pela técnica de oscilações forçadas / Analysis of the changes in the respiratory mechanics dued to aage by the Forced Oscilation Technique
O crescimento do percentual de idosos na população ocorre mundialmente tornando necessário conhecer o impacto do processo de envelhecimento, neste contexto, do sistema respiratório. O desconhecimento do impacto do envelhecimento associado a diferentes graus de exposição a poluentes e a presença de comorbidade(s) dificulta a diagnose das pneumopatias a
Publicado em: 2009
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15. Modelagem e identificação de parâmetros hidrodinâmicos de um veículo robótico submarino. / Modelling and Identification of hydrodynamic parameters of an underwater robotic vehicle.
In this work, a procedure for experimental identification of hydrodynamic coefficients of unmanned underwater vehicles is presented. At first, the development of a testbed for research on dynamics, control, and navigation of underwater vehicles is presented. This experimental platform includes: 1) a open-frame semi-autonomous unmanned underwater vehicle name
Publicado em: 2008
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16. Forced oscillation assessment of respiratory mechanics in ventilated patients
The forced oscillation technique (FOT) is a method for non-invasively assessing respiratory mechanics that is applicable both in paralysed and non-paralysed patients. As the FOT requires a minimal modification of the conventional ventilation setting and does not interfere with the ventilation protocol, the technique is potentially useful to monitor patient m
BioMed Central.
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17. Forced oscillation technique and spirometry in cold air provocation tests.
BACKGROUND: Impedance measurements by the forced pseudo random noise oscillation technique can be used to study the mechanical characteristics of the respiratory system. The objective of this study was to analyse the changes in impedance to a cold air provocation test in patients with asthma, and to correlate these changes with those in the forced expiratory
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18. Evaluation of the forced oscillation technique for the determination of resistance to breathing
Total respiratory resistance (RT) was measured by the application of a sine wave of airflow to the mouth at the resonant frequency of the respiratory system. The mean respiratory resistance of 42 normal subjects, measured at a mean functional residual capacity of 3.3 liters, was 2.3, SD ± 0.5, cm H2O/liter per sec, and the resonant frequency was between 5 a
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19. Animal models of asthma
Studies in animal models form the basis for much of our current understanding of the pathophysiology of asthma, and are central to the preclinical development of drug therapies. No animal model completely recapitulates all features of the human disease, however. Research has focused primarily on ways to generate allergic inflammation by sensitizing and chall
American Physiological Society.
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20. Does the outcome of the tidal breathing and dosimeter methods of assessing bronchial responsiveness in children with asthma depend on age?
As minute volume increases with age, a study was carried out to determine whether the measurement of bronchial responsiveness to pharmacological agents with the tidal breathing technique in children might be influenced by age. Bronchial responsiveness to histamine administered by tidal breathing was therefore compared with that produced with a dosimeter in 2
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21. Effects of hypercapnia and hypocapnia on respiratory resistance in normal and asthmatic subjects.
The effects of hypercapnia and hypocapnia on respiratory resistance were studied in 15 healthy subjects and 30 asthmatic subjects. Respiratory resistance (impedance) was measured with the pseudo-random noise forced oscillation technique while the subjects rebreathed from a wet spirometer in a closed respiratory circuit in which end tidal carbon dioxide tensi
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22. Effects of acute and chronic administration of β-adrenoceptor ligands on airway function in a murine model of asthma
The clinical effects of treatment withn β-adrenoceptor (β-AR) agonists and antagonists in heart failure vary with duration of therapy, as do the effects of β-AR agonists in asthma. Therefore, we hypothesized that chronic effects of “β-blockers” in asthma may differ from those observed acutely. We tested this hypothesis in an antigen (ovalbumin)-drive
National Academy of Sciences.
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23. Effect on histamine responsiveness of reducing airway dimensions by altering posture.
Baseline airway geometry is thought to be an important determinant of the airway response to challenge; this geometry is altered by changing posture. The effect of changes in posture on airway calibre, midtidal lung volume, and the airway response to inhaled histamine was studied in eight healthy subjects (four female; mean (SD) age 29.8 (5.1) years, FEV1 3.
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24. Prostaglandin F2 alpha enhancement of capsaicin induced cough in man: modulation by beta 2 adrenergic and anticholinergic drugs.
The effect of inhaled prostaglandin (PG) F2 alpha on the response to the inhaled tussive agent capsaicin was investigated in normal subjects. Seven subjects inhaled three breaths of four doses of capsaicin (0.3, 0.6, 1.2, and 2.4 nmol) before and immediately after inhaling PGF2 alpha (0.1 mumol) or placebo (0.15M NaCl) on separate days. The numbers of capsai