Active clinical trials for "Sleep Apnea, Obstructive"

The investigators hypothesize that chemoreflex response of muscle sympathetic nerve activity (MSNA) during hypoxia and hypercapnia will be increased in coronary artery disease (CAD) patients and that the presence of obstructive sleep apnea (OSA) will potentiate these responses. And, that the exercise training would decrease the chemoreflex response of MSNA in these patients.

To investigate the accuracy of neck ultrasound in identifying and discriminating the severity of obstructive sleep apnea (OSA). Primary objective: To test the hypothesis that ultrasound can be used as a reliable tool for identifying the anatomic characteristics and dynamic changes of pharyngeal airspace in patients with OSA. Secondary objective: Investigate if ultrasound can be used to discriminate OSA severity. The investigators will compare these results to the results from polysomnography study.

This study intends to determine whether continuous positive airway pressure (CPAP) can reduce arterial stiffness (measured by pulse wave velocity) in nonsleepy as well as in sleepy patients with obstructive sleep apnea .

Individuals with obstructive sleep apnea syndrome (OSAS) are at high risk for cardiovascular morbidity and mortality. The effect of long-term nocturnal therapy with continuous positive airway pressure (CPAP) on daytime baroreflex sensitivity (BRS), a predictor of cardiac death, was investigated in OSAS patients.

This study will determine the effect of ventilatory stimulation on obstructive sleep apnea in selected patients with stroke. We will select a subset of patients with stroke in the prior 3 months who are most likely to have ventilatory instability as a cause of the upper airway obstruction as indicated by the absence of obesity, an abnormal hypocapnic apnea threshold and resolution of obstructive apnea during CO2 administration. Following baseline polysomnography, patients will be randomly assigned to acetazolamide (250 mg hs [at bedtime]) versus placebo for 7 days. Polysomnography will be repeated and then subjects will cross-over therapies for another 7 days followed by a final nocturnal polysomnography.

The purpose of this protocol is to improve the current FDA-approved continuous positive pressure auto-titration algorithm, including treatment precision, residual disease detection characteristics and phenotyping with the DeVilbiss brand AutoAdjust CPAP device.

Patients with a medical condition known as obstructive sleep apnea may be at increased risk of delirium following surgery. This study loans autotitrating CPAP machines to randomly-selected patients who are at high-risk for obstructive sleep apnea with the goal of preventing post-operative delirium.

The purpose of this study is to test whether different indoor temperature affect the frequency of sleep apnea.

Continuous positive airway pressure (CPAP) is the most commonly used treatment for obstructive sleep apnea. Nasal symptoms such as dryness, itching and congestion are common in CPAP users. Nasal and sinus saline irrigation has been shown to improve these symptoms in individuals with chronic nasal congestion and sinusitis. This is an 8 week study that investigates whether daily saline nasal and sinus irrigation reduces nasal symptoms in patients using CPAP, improves quality of life and CPAP compliance.

This study will evaluate the pharynx in patients undergoing lateral pharyngoplasty for treatment of obstructive sleep apnea through MRI, before and 6 months after surgery.