Active clinical trials for "Sleep Apnea Syndromes"

The aim of the study is to assess the effect of adenotonsillectomy on level of asthma control in preschool children with obstructive sleep apnea.

Patients with treatment-naive obstructive sleep apnea (OSA) who need continuous positive airway pressure (CPAP) therapy on clinical basis are included as well as healthy controls without OSA. 15 cc peripheral venous blood is drawn on the date of diagnosis of OSA and 3-6 months after CPAP therapy. Granulocytes are harvested and tested for its function, such as phagocytosis, reactive oxygen species (ROS) production and bacteria-killing ability.

Obstructive sleep apnea (OSA) is a highly prevalent breathing disorder in sleep. We have aimed to evaluate the relationship between OSA and prolidase activity, the oxidative stress index (OSI), total antioxidative capacity (TAC), and total oxidative capacity (TOC) and the relationship between carotid intima media thickness (CIMT).

To treat lower urinary tract symptoms (LUTS) and erectile dysfunction (ED), we mainly have symptomatic drug treatments. Some patients are resistant to the treatments that we have or are forced to stop treatments because of side effects. It would be interesting to focus on comorbidities and to evaluate whether it is possible to improve the urological symptoms by taking care the comorbidities, which would consist in an etiological treatment of the urological symptoms. The aim of the study is to evaluate the evolution of low urinary tract disorders (LUTS) and erectile dysfunction (ED) in patients with obstructive sleep apnea syndrome (OSAS) following by continuous positive airway pressure equipment (CPAP) at night. Participation in the study will be offered to all patients, men and women, consulting or hospitalized in the sleep unit of the department of pneumology CHU of Reims for a nocturnal ventilatory polygraphy or a polysomnography diagnostic of OSAS. Men will complete three questionnaires about LUTS and DE, women one questionnaire about LUTS. The questionnaires will be completed twice, the first time when consulting at the sleep unit for nocturnal ventilatory polygraphy or a polysomnography diagnostic of OSAS ; the second time during the pneumology consultation three months later. We will compare the results between the questionnaires to assess whether OSAS equipment with CPAP has improved urologic symptoms. If the management of OSAS allows an improvement of lower urinary tract disorders and / or an improvement of erectile dysfunction, these results would be interesting for the management of patients resistant to symptomatic drug treatments or to stop them because of iatrogenic side effects. Etiological rather than symptomatic management would also have long-term benefits, both in improving the overall quality of life of the patient and in the medical and economic field. It might be interesting to identify in urology consultation among patients consulting for LUTS or ED, patients at risk of presenting OSAS and referring them to a pulmonologist to manage OSAS if it exists, from the beginning of the urological care.

A new study have shown that high nighttime blood pressure (BP) and/or non-dipping (lack of fall in blood pressure during nighttime) is a strong predictor for the risk of cardiovascular disease and mortality in patients with hypertension. Three factors seem to affect the night time blood pressure: chronic kidney disease, obstructive sleep apnea (OSA) or the way ambulatory blood pressure is monitored. The aim of this study is to analyse the importance of these three factors on nighttime bloodpressure. Hypothesis: Central 24 hour blood pressure monitoring provides another measure of daily fluctuations in blood pressure than peripheral 24 hour blood pressure monitoring, because measurement is painless and does not interfere with activities during the daytime or night-time sleep In chronic kidney disease and OSA the decrease in nocturnal BP is lower than in healthy subjects. In chronic kidney disease the decrease in the nocturnal BP is inversely correlated to the severity of OSA, the severity of kidney disease, and blood pressure during daytime.

Changes in epigenetic regulation of genes involved in systemic inflammation and metabolic dysfunction in OSA are linked with accelerated cardiovascular morbidity.

The primary aim is to determine whether patients with suspected OSAHS as predicted by the STOP-BANG questionnaire will have an increased length of stay (LOS) in the postanesthesia acute care unit (PACU) compared with those without suspected OSAHS. The second aim will be to determine the LOS in patients with known sleep apnea by history. This length of stay will be compared with LOS in patient with an affirmative response to the STOP-BANG questionnaire to determine if prior knowledge of diagnosed sleep apnea will be associated with a lower LOS than in patients with suspected OSA. The third aim will be to characterize the adverse clinical outcomes (respiratory, cardiovascular, and neurological) associated with suspected OSAHS in patients who respond affirmatively to the STOP-BANG questionnaire and in those patients with known OSA. These data (including number of desaturations, bradypnea, brady- or tachycardia, and use of reversal agents) will be recorded by the PACU nursing staff. Unexpected admissions to the hospital and transfers to the intensive care units will also be measured. These data will help identify the most critical determinants of length of stay.

Research design: This is a controled prospective study. Methodology: Patients with newly diagnosed and untreated OSA with total apnea-hypopnea index (AHI) >5/h, and control (AHI<5/h) will be recruited from the Long Beach VA sleep center. Controls are subjects without OSA or other sleep disorders and no sign of pulmonary hypertension based on echo. The investigators also measure pulmonary artery pressure by 2D Echo and exclude patient with any sign of left heart dysfunction. PH will be defined as RVSP > 35 mmHg or mean PA pressure>25 mmHg. The investigators will recruit subjects with and without PH and OSA in three separate groups: group one : OSA+ PH, group two: normal individual with no OSA and no PH, group three: OSA with no PH Pulmonary function test will be done to exclude patients with underlying lung disease. The inclusion criteria is: Age >20, AHI >5, AHI <5 (as control), RVSP > 35 mmHg OR Mean PA pressure>25 mmHg, RVSP < 35 mmHg OR Mean PA pressure < 25 mmHg (as control). Subjects will be excluded if they had known peripheral vascular disease, liver disease, hemolytic anemia, inflammatory disease, active infection, or if they were pregnant, on therapy for OSA, on chronic steroid treatment, or younger than 20 years of age, patients with left heart failure (systolic or diastolic), patients are on PH medications including sildenafil, active smokers, COPD and asthma, active infection or inflammatory disease and collagen vascular disease. Nocturnal polysomnography will be performed and scored according to the American Academy of Sleep Medicine. Exhaled Carbon monoxide (CO) will be measured with a calibrated fuel cell type electrochemical device with sensor sensitivity of 1 ppm. The mean of three reproducible measurements will be recorded and corrected for ambient CO. Exhaled Nitric Oxide (NO) will be measured. At each testing session, at least three flow-regulated FENO measurements will be performed. The investigators will repeat 2D Echo and measurements of above factors after 3 months of CPAP treatment. The investigators also check patient's compliance with the treatment by downloading data off of their CPAP device. Each subject will be informed of the experimental procedures, which is approved by the Human Investigation Committee of the VA-Long Beach. Finding: The investigators hypothesize that HO pathway causing perturbation of pulmonary endothelial function by inhibition of nitric oxide. Clinical significance: OSA is associated with PH, but exact mechanism is not well known. In the past, I have shown that increased endogenous CO in the setting of elevated NO concentration is associated with endothelial dysfunction in patient with OSA. Therefore, the investigators sought to investigate the roles of HO and NO pathways in patients with OSA associated with PH. Impact/significance: It addresses a fundamental gap in our understanding of how OSA results in increase the pulmonary artery pressure and if substantiated, will provide the basis for the design and testing of new approaches to prevention and treatment of OSA.

The purpose of the study is to investigate the prevalence, clinical predictors and consequences (effect on survival, chronic rejection) of sleep disordered breathing in lung transplant recipients.

Sleep-disordered breathing in children is characterized by recurrent events of partial or complete upper airway obstruction during sleep, resulting in disruption of normal gas exchange (intermittent hypoxia and hypercapnia) and sleep fragmentation. The major symptom is snoring or noisy breathing. Sleep Disordered Breathing (SDB) is a wide spectrum of disorders that includes primary snoring, UARS and OSA. The main etiology for SDB in children is enlarged tonsils and adenoids and therefore the first line of treatment in pediatric SDB is adenotonsillectomy. The objectives of this study are: To investigate the natural history of primary snoring To investigate the effect of seasonality on SDB severity To compare the effect of adenoidectomy to adenotonsillectomy in the treatment of SDB in children To characterize the children referred for repeated PSG following adenoidectomy or adenotonsillectomy and the indications for second PSG evaluation.