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Airway Wall Thickness And Heterogeneity Are Key Determinants Of Asthmatic Airway Function.
Funder
National Health and Medical Research Council
Funding Amount
$207,509.00
Summary
Asthma is a common disease which is typified by excessive narrowing of the airways in response to stimuli that are trivial to non-asthmatic individuals. However, little is known about what causes asthmatic airways to be able to narrow so excessively. In this study, we will be looking at the importance of thickening of the airway walls in relation to excessive airway narrowing in asthmatics. We will also look to see how patchy the airway narrowing is in asthmatics and how this relates to excessiv ....Asthma is a common disease which is typified by excessive narrowing of the airways in response to stimuli that are trivial to non-asthmatic individuals. However, little is known about what causes asthmatic airways to be able to narrow so excessively. In this study, we will be looking at the importance of thickening of the airway walls in relation to excessive airway narrowing in asthmatics. We will also look to see how patchy the airway narrowing is in asthmatics and how this relates to excessive airway narrowing that occurs in severe asthmatic attacks. We will therefore be studying asthmatics of varying degrees of disease severity as well as those admitted to hospital because of acute severe attacks of asthma, and comparing them with a group of non-asthmatic subjects.Read moreRead less
Intrinsic Response Of Airways To Cyclical Dilation And Elongation In Breathing
Funder
National Health and Medical Research Council
Funding Amount
$355,014.00
Summary
Variations in lung pressures during breathing produce cyclical expansion of the airway tubes. These respiratory movements provide one of the most powerful protective mechanisms for the lung. The protective mechanism fails in asthma so that cyclical expansion of the airway tubes can make breathing more difficult. Current belief is that protective and harmful effects of lung expansion occur by either relaxation or contraction of the muscles lining the airway tubes. Findings from this laboratory su ....Variations in lung pressures during breathing produce cyclical expansion of the airway tubes. These respiratory movements provide one of the most powerful protective mechanisms for the lung. The protective mechanism fails in asthma so that cyclical expansion of the airway tubes can make breathing more difficult. Current belief is that protective and harmful effects of lung expansion occur by either relaxation or contraction of the muscles lining the airway tubes. Findings from this laboratory suggest that the above dogma needs reconsideration. The project will utilize a novel model of the lung to enable us to determine the mechanisms producing both the protective effect, and in asthmatics the harmful effects of cyclical lung expansion. Once the part of the lung that 'fails' in this aspect of asthma has been detected then therapeutic strategies can be put in place to reverse the defect.Read moreRead less
Clinical And Physiological Features Of Obstructive Sleep Apnoea Phenotypes
Funder
National Health and Medical Research Council
Funding Amount
$117,331.00
Summary
Obstructive sleep apnoea has variable causes and clinical effects in different patient groups. My research will quantify the contribution of various physiological processes to the development of upper airway obstruction in different sub-types of sleep apnoea and to determine how this affects clinical presentation. I will be measuring a number of physiological parameters, and finding out how sleep apnoea manifests in terms of symptomatology and adverse health effects.
The uneven way that airways narrow (heterogeneity) would seem to be an important factor affecting the natural history, clinical expression and response to treatment in patients with severe asthma. In this study we will be looking at the mechanism for heterogeneity in sufferers of severe asthma in relation to how stiff the lung is and the type of inflammation seen in these patients.
Regulation Of Pulmonary Responsiveness By Chronic Mechanical Strain And Its Role In Obstructive Lung Disease
Funder
National Health and Medical Research Council
Funding Amount
$287,321.00
Summary
The pressures required to breathe place a continuous but varying mechanical strain on airway passages and lung tissue. This mechanical strain may protect the airway from collapsing, however, this protection is deficient in lung diseases such as asthma. This project considers the possibility that abnormal mechanical strain occurring in lung disease predisposes the individual to debilitating and potentially life-threatening airflow obstruction.