View clinical trials related to Apnea.
Filter by:Heart failure affects approximately 5-6 million North Americans and is increasing in prevalence. Sleep-related disorders, such as obstructive sleep apnea (OSA) often coexist (11-37% incidence) with heart failure. OSA is the repeated temporary interruption of breathing during sleep and occurs when the air passages in the upper respiratory tract become blocked during sleep. OSA adversely affects the cardiovascular system resulting in hypoxia (decrease in oxygen supply), which decreases the oxygen supply to the heart. Patients with OSA are treated with continuous positive airway pressure (CPAP). It has also been shown that CPAP reduces angina during sleep, minimizes sympathetic nervous system (SNS) activation and improves left ventricular (LV) function, although the mechanism of action is not clear. Carbon-11 acetate PET imaging allows for the assessment of how the heart works and how efficiently the heart uses oxygen in certain circumstances. Carbon-11 hydroxyephedrine (HED) measures cardiac nervous system activity, which may have an effect on heart rate. The study will evaluate the term effects of continuous positive airway pressure (CPAP), a common treatment for patients with OSA, on the heart's efficiency or ability to work and its effect on the nervous system activity of the heart. Two patient groups will be evaluated 1.) patients with congestive heart failure and obstructive sleep apnea will be randomized to early or late CPAP to address the primary hypothesis of the study and 2.) patients with congestive heart failure only (matched control group). Both the primary randomized study group and secondary study group will be evaluated using [11C]acetate PET, [11C]HED PET and echocardiography. Measurements will be obtained at baseline, 1 week (where possible) and 6-8 weeks.
Nasal Continuous Positive Airway Pressure (CPAP) is the standard therapy for obstructive sleep apnea hypopnea syndrome (OSAHS). This is most commonly administered as a single positive pressure that has been individualized for the patient to prevent obstructive respiratory events. However, the therapeutic pressure may vary by sleep stage and body position within a single night and may change over the course of several nights. One approach to dealing with this variability is the use of automatically adjusting CPAP that responds to patient breathing patterns with alterations in the delivered pressure. This study is designed to determine the effectiveness of using the energy spectrum analysis of flow signals to automatically adjust CPAP pressure and improve sleep variables. Thirty subjects who require CPAP will be recruited from the NYU sleep disorders center. Following diagnostic studies (either split night or full night) the subject will undergo a night of treatment with the Fisher and Paykel Healthcare AutoPAP. Efficacy of treatment will be evaluated based on normalization of sleep disordered breathing while treated with the AutoPAP.
The primary objectives of this study are to evaluate the safety and efficacy of VI-0521 compared to placebo in the treatment of obese adults with obstructive sleep apnea (OSA) and to assess the relative contributions of weight loss on parameters of OSA in these subjects.
The purpose of this study is to determine whether ambulatory polygraphy during a short hospitalization in a neurology unit has the same performance than inpatient polysomnography, the actual gold standard, in the diagnosis of sleep apnea in patients suffering from multiple system atrophy (MSA).
Recent evidences suggest that obstructive sleep apnea (OSA) can contribute to cardiovascular disease even in the absence of hypertension. However, there are few data regarding the impact of OSA on the preHypertension and Masked Hypertension in apparently normotensive patients with OSA as well as the impact of treatment with continuous positive airway pressure.
Non-alcoholic fatty liver disease is associated with obstructive sleep apnea. Abnormalities in liver enzymes can improve following continuous positive airway pressure in patients with obstructive sleep apnea. Computerized tomography can be used to quantify fatty liver changes. We hypothesize that continuous positive airway pressure can reduce morphologic fatty liver changes in patients with obstructive sleep apnea and non-alcoholic fatty liver, an that this reduction can be evident using computerized tomography
The primary objective of this study is to observe if Sibutramine is effective in improving the symptoms and signs of sleep apnea in obese patients. The secondary objectives are to document the effects of Sibutramine on heart rate variability and 24-h arterial pressure values. We hypothesized that sibutramine will improve sleep disordered breathing, cardiac autonomic function and systemic blood pressure in obese patients with obstructive sleep apnea (OSA).
The purpose of the study is to investigate the effect of acetazolamide as a treatment for sleep related breathing disturbances in patients with the obstructive sleep apnea syndrome living at low altitude during a sojourn at moderate altitude
The purpose of this study is to report the incidence of ventricular arrhythmias correlated to the SAS and to focus on the interest of diagnosing Sleep-disorders breathing in ICD patients. This diagnosis will be assessed by an ambulatory nasal pressure recording with portable multi-channel recorder associated to a complete SAS related symptoms questionnaire.This clinical trial will be the first step to gather information about the suspected sleep relation between ventricular arrhythmias and Sleep breathing disorders, in order to improve the management and treatment of such arrhythmias in next generation of defibrillators which will integrate a minute ventilation sensor able to monitor breathing.
Obstructive Sleep Apnea (OSA) is the most common sleep disorder affecting up to 9-24 percent of middle aged adults, and is becoming increasingly implicated in the pathogenesis of hypertension, and other cardiovascular disorders. Up to half of patients with OSA have hypertension, and their risk of developing hypertension increases with the increasing severity of Sleep Apnea. Patients with OSA and no hypertension have endothelial dysfunction, which is believed to be the precursor for most cardiovascular disorders. The upper airway collapse and obstruction that occur in OSA result in a pattern of intermittent hypoxia, that has been shown to be the cause of the hypertension, and endothelial dysfunction found in patients with OSA. Intermittent hypoxia results in oxidative stress, which in turn is linked to the pathogenesis of hypertension and endothelial dysfunction. This protocol evaluates the role of the oxidative stress in endothelial function and blood pressure in patients with OSA. This is a pilot clinical study that will compare oxidative stress parameters, and endothelial function in patients with OSA before starting treatment with continuous positive airway pressure (CPAP) and 12 weeks post being on CPAP. These patients will be compared to control patients with no history of OSA. the study does not involve assignement to different treatments. All patients will receive the indicated treatment for OSA and measurements will be collected before and 12 weeks after adequate treatment.