Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 18 of 18 for “"Airway resistance."”.
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Neurally Released Nitric Oxide does not Oppose Reflex Cholinergic Contraction of Airway Smooth Muscle in Dogs
When afferent nerve endings in the airway detect a foreign substance, centrally mediated reflexes, acting through cholinergic parasympathetic efferents, contract airway smooth muscle. It has been proposed that these efferents also release nitric oxide, which relaxes airway smooth muscle, and that …
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Speech Aerodynamics of American English and Japanese Speakers
… air pressure, laryngeal air flow, laryngeal airway resistance, and volume of air expired per syllable were compared across group and across gender for seven American English speakers and seven Japanese speakers. Estimated subglottal air pressure, laryngeal air flow, and laryngeal airway …
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Influence of Obstructive Sleep Apnea (OSA) on Rostral Fluid Shift, and the Pathophysiology on Asthma
… of asthma, declined lung function, increased airway hyperresponsiveness, and greater need for asthma medications. Previous studies showed that overnight fluid shift from the legs into the neck and peripharyngeal tissues increases upper airway resistance and severity of OSA. Recent findings …
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The role of autophagy in allergic inflammation: a new target for severe asthma
… and challenge 4 4. Treatment protocols 5 5. Airway resistance measurements 6 6. Bronchoalveolar lavage and lunghistology 6 7. Cytokine levels in lung BALfluid 7 8. The measurement ofLC3expression 8 9. Electron microscopy 8 10. Atg5 knockdown 8 11. Double immunofluorescence staining 10 12. …
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Acoustical and flow characteristics of a cough as an index of pulmonary function in the guinea pig
… different stages of chemically induced specific airway resistance (sRAW). Coughs were divided into three categories (low sRAW, n = 113; moderate sRAW, n = 143; high sR AW, n = 93). 124 cough sound parameters were derived from the analysis of the sound pressure waves recorded during the cough. A …
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Neural adaptive mechanisms in respiratory regulation : theory and experiments
… meet the stresses of high altitude or increased airway resistance. The question remains then: what neural processes in the brainstem controller participate to engender such sophisticated autonomic regulation? The primary aim of this thesis was to uncover and characterize the central adaptive …
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Existence of patchiness in constricted lungs : from experiments to complex system modeling
… and physicians pinpoint mechanisms that govern airway hyperresponsiveness and effectively treat complex respiratory diseases such as asthma. The advancement in this research field has been prompted by the usage of medical imaging technology and computational modeling providing a subjectspecific, …
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Modulation of Hypoglossal Motoneurons by Nitric Oxide
… (OSA)- the occurrence of repetitive episodes of airway obstruction during sleep- is considered a major health problem affecting up to 9% of adults in the United States (Parish & Somers, 2004). The hypoglossal motor nucleus (HMN) controls genioglossus muscle tone and is critically important for …
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Rhinomanometry in clinical use. A tool in the septoplasty decision making process.
… obstruction. Rhinomanometry measures the nasal airway resistance (NAR) for each nasal cavity. Septal deviations are common with prevalences of up to 58% with the majority having no nasal complaints. Septoplasty can straighten the septum. In Sweden on average 24% of patients are dissatisfied 6 …
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The Effects of Progressive Relaxation and Myoelectric Feedback on Respiratory Resistance in Bronchial Asthmatics
… of relaxation on the smaller or peripheral airways of a convenience sample of six asthmatic subjects fourteen to seventy years of age. It was hypothesized that an increased degree of total body relaxation would result in a decrease in airway resistance as would be evidenced by the changes in …
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A Computational Model of Inert Gas Mixing in the Lung
… structure and lack any contribution from airway resistance and tissue compliance. These models have provided much of the current understanding of the general features of expired gas washout tests, but they cannot be used to bridge to regional ventilation data acquired using …
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Adaptive lung growth following exposure to simulated high altitude
… for FVC) and an increase in specific upstream airway resistance while in normobaric hypoxia, FEV0.1/FVC%, expiratory flow rates (absolute and FEF corrected for FVC, and PEER) decreased but both absolute and specific upstream airway resistance increased. However, static compliance remained …
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Unstable Ventilatory Control During Sleep After High Spinal Cord Injury: The Contribution Of Chemosensitivity And Hypoventilation
… measurement of ventilation, timing, and upper airway resistance (RUA) on a breath-by-breath basis during transitions from wake to stage N1 sleep. Compared to able-bodied controls, SCI subjects had a significantly greater reduction in tidal volume during the transition from wake to N1sleep (from …
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Neurokinin-1 antagonism as a novel treatment for feline asthma : investigation of the role of substance p in airflow limitation and airway inflammation
… and/or episodic respiratory distress induced by airway hyperresponsiveness (AHR), airway eosinophilia, and airway remodeling. Homeostasis in the lung is partially maintained by the neuroimmune axis, where cross-talk between these systems is mediated via cytokines, neuropeptides and their …
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The Role of Hydrocortisone on the Development and Maintenance of Ion Transport Pathways Essential to Mucociliary Clearance in Differentiated Normal Human Bronchial Epithelial Cells
The airway epithelium establishes a boundary between the internal and the external environment that protects against potential injury and infection caused by inhaled particles, debris and microbial pathogens. In order to maintain the health of the lungs and surrounding tissues, the epithelium …
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Lung function in perinatally HIV-infected adolescents on antiretroviral therapy in Cape Town, South Africa
… and functional residual capacity; and higher airway resistance and lung clearance index compared to HIV-uninfected adolescents, p< 0.05 for all. At 24 months, FEV1 and FVC remained lower in the HIV-infected compared to the uninfected, p< 0.05 for both. Impaired cardiopulmonary function was …
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Cerebrovascular and respiratory adaptations following 4 weeks of transient hypercapnic aerobic exercise.
… was related to a reduction in cerebrovascular resistance. Additionally, aerobic exercise training with NB displayed signs of greater alveolar elasticity.
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Diagnostische Relevanz der Impuls-Oszillometrie im Vergleich zur Bodyplethysmographie im Kindesalter
… der IOS erzielten mit einem CV von 10,4% für die Resistance bei 5 und 10 Hz und 10,6% für die Impedanz geringfügig bessere Ergebnisse als die Widerstände der BP. Der CV der Resonanzfrequenz war 9,5%. Für die Reaktanzen ist eine Berechnung des Variationskoeffizienten auf Grund des Betrags der …