Active clinical trials for "Apnea"

The purpose of this study is to check blood and urine levels to further define markers/tests in the blood and urine that would be useful in following patients with obstructive sleep apnea and then to see if by wearing CPAP every night, these markers can be reduced. This research is being done because currently there are no effective blood or urine markers to determine how well CPAP is working.

This prospective cohort study aimed to assess the phenotypic characteristics of OSA patients and their pattern of antihypertensive drugs consumption. The investigators also aimed to investigate a hypothetical association between ongoing anti-hypertensive regimen and Blood pressure control rates in these patients. Additionally, the investigators were also interested in trying to understand if the control of OSA may be influenced by the use of different classes of anti-hypertensive drugs.

The purpose of this study is to evaluate the diagnostic accuracy of polysomnography indexes for diagnosis of sleep apnea in human subjects obstructive sleep apnea (OSA). This includes evaluation of polysomnography indexes (AHI; AI, arousal index; ODI, oxygen desaturation index) and heart rate variability (HRV) indexes.

In this open prospective study 40 patients who received Mandibular Replacement Appliance (MRA) Therapy as treatment of Obstructive Sleep Apnea Hypopnea Syndrome (OSAHS) will be included. The patient's sleep will be registered during 2 periods of 2 days: one while the patient does not wear the MRA and, +/- 1 week later, one while the patient wears the MRA. Furthermore, 2 low dose CT scans (one with and one without the MRA device in the mouth) will be taken. These data must allow the investigators to validate the use of functional imaging (segmentation and Computational Fluid Dynamics) as a predictor of the outcome of the MRA therapy in OSAHS patients.

Obstructive sleep apnea (OSA) is a clinical syndrome characterized by repetitive closure of the airway and frequent awakenings during sleep. Repeated episodes of hypoxia, decrease in intrathoracic pressure, increased venous return and venous stasis, damage to vascular wall may ensue. An increased tendency for coagulation has also been reported in OSA. Venous stasis, vascular endothelial activation and hypercoagulability are also known risk factors for thromboembolism. All of these pathophysiologic changes in OSA may predispose patients for the development of pulmonary embolism (PE) however there is limited data about role of thromboembolic events in OSA.

The investigators hypothesize that there is a strong correlation between OSA and TBM/HDAC. Our hypothesis is based on the similarities in mechanism (airway collapse), symptoms (daytime and nocturnal dyspnea) predisposing conditions (obesity and neuromuscular abnormalities of the chest wall and the diaphragm), and effect of interventions (CPAP and BIPAP) in these diseases.

The objective of this prospective cohort study in patients with a known thoracic aortic aneurysm is to test the hypothesis that yearly aneurysm progression rate is higher in patients with obstructive sleep apnoea (OSA) compared to patients without OSA, and that the need for aortic operation or proven or presumed death from aortic rupture or dissection happens more often in patients with thoracic aortic aneurysm and OSA compared to patients without OSA.

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.

Introduction: OSAS is an important disease in the actual medic scene. It is important for correlation with chronic cardiovascular disease that leaves an increase in morbimortality and socioeconomic disability to patients with apnea. Objectives: Determinate the correlation between Friedman Classification and the obstructive sleep apnea syndrome (OSAS) gravity through AHI (Apnea Hypopnea Index) in patients with OSAS for surgical indication and evaluation. Materials and Methods: The investigators evaluated and classified 84 patients, in the scale of Epworth, Friedman and how much the gravity of the SAHOS for the AHI.

The purpose of this study is to determine the structural and functional cardiac alterations in obstructive sleep apne (OSA) independent from systemic and pulmonary arterial hypertension and their correlation to the severity of OSA.