Active clinical trials for "Sleep Apnea, Obstructive"

Obstructive sleep apnea (OSA) is a respiratory disorder of sleep characterized by recurrent episodes of complete or partial upper airway obstruction, leading to intermittent oxygen deprivation. This results in sympathetic activation and surges in blood pressure, production of vasoactive substances, as well as activation of the inflammatory and procoagulant pathways. Epidemiological evidence indicates the prevalence of OSA is higher in patients with coronary artery disease than in the general population. The investigators recently showed that 65.7% and 41.9% of the Singapore patients admitted with myocardial infarction were found to have previously undiagnosed OSA and severe OSA, respectively. In a 10-year follow-up epidemiological study, OSA was independently associated with a higher prevalence of fatal and non-fatal cardiovascular events among the otherwise healthy general population. The investigators further showed that in patients who have undergone primary percutaneous coronary intervention for acute myocardial infarction, OSA was an independent predictor of future adverse event rates. Despite the observed association between OSA and adverse cardiovascular outcomes, the underlying pathophysiological mechanisms remain unclear. In this proposal, the investigators aim to elucidate the relationship between OSA and composition of coronary atherosclerotic plaques.

we evaluate the presence of OSA in patients that have a computed tomography (CT) of the chest to rule out pulmonary embolism (PE) to determine if OSA constitutes an independent risk factor for PE.

Purpose: In a retrospective cohort the investigators will validate, the goodness of a multidimensional index to classified the severity of patients with sleep disordered breathing that has been previously developed in a prospective longitudinal cohort.

Rationale: Obesity is an increasing childhood epidemic in Canada. Obstructive sleep apnea (OSA) is a complication of obesity which causes cardiovascular disease, reduced quality of life, and premature death. While the complex interactions between obesity and OSA are not entirely clear, we hypothesize that these conditions may compound each other by: decreasing physical activity and total energy expenditure by reducing both non-exercise physical pursuits (NEAT- non-exercise activity thermogenesis) and purposeful physical activity. alterations in the secretion of appetite-controlling hormones, which may lead to increases in energy intake. Objective: To determine whether the presence of both obesity and OSA in children is associated with a decrease in physical activity and alterations in appetite-regulating hormones greater than those seen in either condition alone or compared to controls. Methods: Comparison of children 10-17 years with obesity and OSA, obesity alone, OSA alone and neither condition, for the following outcomes: (1) NEAT (kcal/day) (2) Physical activity behavior, appetite regulating hormone profile and self-report appetite assessment. Unique Aspects: This study combines expertise in sleep medicine, exercise physiology and obesity. Conclusions from this study will better characterize this high-risk clinical population so that innovative strategies targeting improvements in lifestyle behaviors can be developed.

Sleep-disordered breathing (SDB) in children may be responsible for disruptive daytime behaviors such as inattention and hyperactivity. Many children undergo tonsillectomy for SDB and disruptive daytime behaviors. However, the link between SDB and disruptive behavior is not clearly understood. This study will evaluate the relationship between SDB and disruptive behavior.

Assessment of the lung hyperinflation by bodypletysmography in patients with obstructive sleep apnoea treated with continuous positive airway pressure therapy.

It is a prospective, single center, single-arm clinical study to enroll a maximum of 25 subjects.

The investigators will conduct this study to validate Belun Ring for sleep assessment. The investigators will compare Belun Ring data collection and overnight in-lab polysomnography (PSG) measures of SDB and sleep architecture in adults with OSA symptoms. The investigators propose to recruit a total of 40 participants with symptoms of obstructive sleep apnea. The investigators will i) validate the overall accuracy, sensitivity and specificity of Belun Ring to assess SDB and sleep architecture, using PSG analysis as a gold standard.

The OAMMM study is a mono-centrer , non interventional, prospective study, carried out in CH Valence Oral Appliance is indicated for first line moderate sleep Apnea Syndrome or severe sleep Apnea Syndrome after failure of positive airway pressure (CPAP). Clinical impact of each mm advancement of Oral Appliance is imperfectly assessed. The study aim to assess clinical and paraclinical efficacy of an oral Appliance on each mm of advancement.

Chronic rhinosinusitis with nasal polyps (CRSwNP) is a condition resulting in varying degrees of nasal congestion, nasal secretion, facial pain and reduced or absent sense of smell. In Denmark an estimated 200.000 patients suffer from this condition. It affects the quality of life in a degree equivalent to chronic cardiac and respiratory conditions. CRSwNP is known to be associated with inflammation in the nose and sinuses. In some patients the inflammation is also present in the lower airway resulting in shortness of breath, chest constriction, wheezing and coughing. It follows that asthma is often seen in patients with CRSwNP. Even though the association of asthma and CRSwNP is well known it is easy to overlook the asthma further reducing the quality of life. Previous studies have found that undiagnosed asthma is present in about a quarter of patients with CRSwNP. While many of the CRSwNP patients are treated in private ENT practice alone the lack of simple diagnostic tests giving a reliable measurement of airway inflammation is a challenge in diagnosing concurrent asthma. A recent study showed measuring of fractional exhaled nitrogen oxide (FeNO) in exhaled air to be a promising diagnostic test. The concentration of this gas in the exhaled air from the nose and mouth is related to the degree of airway inflammation and can therefore be used as a surrogate measurement in a safe and easy way. With this study the investigators want to measure the concentration of FeNO in patients with CRSwNP in private ENT practices. The aim is to explore if it can be used as a screening test for asthma. The study will also screen the patients for obstructive sleep apnea (OSA). Patients will be recruited from three private ENT practices in the Capital Region of Denmark. Patients with CRSwNP will be recruited from their appointments in the ENT clinics. They will be offered inclusion in the study, and if they give an informed consent, an exhaled NO test and a thorough ENT examination including a fiberoptic examination of the upper airway will be performed. They will also be asked to fill out questionnaires on the severity of symptoms from the nose and lungs, sleep quality and their health in general. Patients will also undergo a sleep study (Cardio-Respiratory Monitoring = CRM) and tests of lung function. With signs of respiratory or sinus disease they will be referred for further investigations and treatment.