Preventing Complications Of Chronic Obstructive Pulmonary Disease
Funder
National Health and Medical Research Council
Funding Amount
$310,914.00
Summary
Chronic obstructive pulmonary disease (COPD) is a devastating lung disease that affects smokers. Lung complications and complications in other organs occur commonly. This study will examine factors that lead to exacerbations of COPD, and test the effectiveness of early diagnosis of coronary artery disease using CT scans.
Prof McEvoy a respiratory physician researching the causes and consequences of sleep breathing disorders. He has a particular research interest in the link between sleep apnea and cardiovascular disease and in increasing access to care for sleep apnea sufferers through the development of new, simplified methods of diagnosis and management.
The Role Of Sleep And Cardiorespiratory Control In The Pathogenesis Of Pre-eclampsia
Funder
National Health and Medical Research Council
Funding Amount
$235,095.00
Summary
Pre-eclampsia occurs in 7-10 % of the pregnant population. This makes it one of the most common diseases associated with pregnancy in the Western world. The cause of pre-eclampsia remains elusive, however, recent research suggests that the initiating factor is abnormal implantation of the placenta into the uterus. This in turn leads to poor flow of blood through the placenta (known as placental ischaemia) resulting in release of mediators (including substances known as cytokines) into the matern ....Pre-eclampsia occurs in 7-10 % of the pregnant population. This makes it one of the most common diseases associated with pregnancy in the Western world. The cause of pre-eclampsia remains elusive, however, recent research suggests that the initiating factor is abnormal implantation of the placenta into the uterus. This in turn leads to poor flow of blood through the placenta (known as placental ischaemia) resulting in release of mediators (including substances known as cytokines) into the maternal circulation which cause widespread damage to the endothelium (the protective layer of cells which line all of the blood vessels throughout the circulation). Furthermore, the greater the demand on the placenta, the more of these toxic substances will be released into the maternal circulation. During sleep, a large proportion of pregnant women snore and consequently have partial reduction in the volume of each breath. In women with healthy placental function, this is not a concern. However, we suggest that in women with pre-eclampsia, this results in further disruption to the blood flow through the placenta, which leads to a greater output of toxic substances from the placenta. We have shown that by controlling snoring during pregnancy in women with pre-eclampsia with the use of nasal continuous positive airway pressure (nasal CPAP), we are able to markedly reduce blood pressure over the night. In this project, we would like to investigate changes occurring during sleep in cytokines in the maternal circulation, and in maternal blood pressure both on and off nasal CPAP in order to establish whether a mechanism during sleep is contributing to the disease process of pre-eclampsia. Furthermore, we intend to investigate whether the long term use of nasal CPAP improves the outcome of pre-eclampsia.Read moreRead less
Pulmonary hypertension is a disease affecting the blood vessels in the lungs that causes severe shortness of breath and early death. Genetic mutations are known to cause this disease but the precise link between these mutations and the changes in the lungs are poorly understood. If we could understand this process better, we could design better treatments. This project will look at how the cells in the lungs communicate with each other and how this process is disturbed in pulmonary hypertension.
Obstructive sleep apnea (OSA) affects 7% of the population and is increasing with the global epidemic of obesity. Research suggests that OSA may be a cause of premature cardiovascular (CV) disease, but definitive proof is lacking. This 5-year trial will answer this question by comparing the rate of CV events (eg stroke, heart attack) in OSA patients who are treated, versus those not treated, with CPAP. The results may lead to a new medical approach to the prevention of CV disease.
The Interactions Between Sleep Disordered Breathing, Metabolic Syndrome And Vascular Risk.
Funder
National Health and Medical Research Council
Funding Amount
$361,030.00
Summary
We will look at two common diseases in the Australian community, the metabolic syndrome and obstructive sleep apnoea (OSA), and explore the common links they have to the risk of disease of the heart and blood vessels. We will then take a group of patients who have both diseases, treat the OSA, and assess the impact of this treatment on their cardiovascular health. Metabolic syndrome is a term given to patients who have high blood sugar, obesity, high lipid levels and raised blood pressure. The A ....We will look at two common diseases in the Australian community, the metabolic syndrome and obstructive sleep apnoea (OSA), and explore the common links they have to the risk of disease of the heart and blood vessels. We will then take a group of patients who have both diseases, treat the OSA, and assess the impact of this treatment on their cardiovascular health. Metabolic syndrome is a term given to patients who have high blood sugar, obesity, high lipid levels and raised blood pressure. The Australian Bureau of Statistics estimates that half the Australian population is overweight, and US studies suggest that nearly of the adult population has metabolic syndrome. This is strongly linked to diseases of the heart and blood vessels, eg heart attacks and stroke. Patients with OSA stop breathing during the night when their throat closes over. The blood oxygen falls, which causes the patient to wake momentarily, then start breathing again. This cycle repeats itself throughout the night. The usual treatment is an air pump (CPAP) connected to a nose mask, which blows air into the throat and prevents closure. This disease is strongly linked to high blood pressure, raised blood sugar levels and heart and blood vessel disease. Patients with the metabolic syndrome will have an overnight sleep study to diagnose OSA, giving the likelihood of having OSA in this group of patients. They will then have extensive investigations of the health of their heart and blood vessels. From these, we will determine which aspects of OSA are more likely to result in cardiovascular disease. Those patients diagnosed with OSA will be treated with CPAP for 3 months. Half the patients will receive normal CPAP; the other half will receive ineffective CPAP. They will then be re-tested and we will compare the results before and after treatment. Thus we will measure likelihood of OSA in this large group of patients, and the health benefits they may gain from treatment of their OSA.Read moreRead less
The Interaction Between Obstructive Sleep Apnea And Cardiovascular Risk Factors On Cardiovascular Disease
Funder
National Health and Medical Research Council
Funding Amount
$1,263,050.00
Summary
Cardiovascular (CV) disease and obstructive sleep apnoea (OSA) are common causes of morbidity and mortality. OSA is an independent risk factor for CV disease but little is known about which patients with OSA are likely to develop CV disease, and the interaction between OSA and other CV risk factors. We seek to better understand this interaction by exploring which of 4,100 well characterised patients in the West Australian Sleep Health Study (WASHS) 2005-2010 have developed CV disease.
THE BAROREFLEX IN SNORING AND THE OBSTRUCTIVE SLEEP APNOEA HYPOPNOEA SYNDROME
Funder
National Health and Medical Research Council
Funding Amount
$436,261.00
Summary
The obstructive sleep apnoea hypopnoea syndrome (OSAHS) refers to a condition in which throat blockage occurs during sleep leading to breathing difficulties, including snoring and cessation of breathing for short periods of time. OSAHS is amongst the commonest of chronic disorders of adult males, occuring in 5% of men over the age of 45 years. It is now recognised that one of the major complications of OSAHS is the development of high blood pressure and heart disease. In the proposed studies, we ....The obstructive sleep apnoea hypopnoea syndrome (OSAHS) refers to a condition in which throat blockage occurs during sleep leading to breathing difficulties, including snoring and cessation of breathing for short periods of time. OSAHS is amongst the commonest of chronic disorders of adult males, occuring in 5% of men over the age of 45 years. It is now recognised that one of the major complications of OSAHS is the development of high blood pressure and heart disease. In the proposed studies, we will examine the proposal that snoring alone, without significant associated OSAHS, can also lead to high blood pressure in habitual snorers both awake and asleep. In particular, we will explore the hypothesis that chronic snoring transmits a pressure wave through the tissues of the neck to the carotid artery which is the main blood supply to the brain. We propose that the chronic vibration of this artery can alter pressure sensors in the artery wall, which then results in the persistance of high blood pressure. Our studies will help to prove that this is a mechanism whereby both snoring and OSAHS may contribute to the development of high blood pressure. The recognition of snoring as an independent risk factor for high blood pressure will clearly have important and wide ranging implications for the future management of snoring in the prevention of high blood pressure.Read moreRead less
Assessing a model of the physiological changes at arousal from sleep. Arousals from sleep are common in the elderly and have adverse consequences. This project will investigate a model of the changes in bodily processes (muscle, brain and cardiovascular activation) that occur when humans awaken from sleep.
Breathing disturbances and reflexes in sleep and effects on sleep and daytime function. This project will investigate protective reflexes in sleep and the impact of breathing disturbances and frequent arousal on markers of brain functioning and health. This will also significantly advance the understanding of key mechanisms promoting unstable breathing in sleep and ill health and functioning from disturbed sleep.