Study to Assess the Changes in Blood Clotting Factors and Blood Vessel Wall Function in Obstructive Sleep Apnea
Variability of Fibrinolytic Markers and Endothelial Function in Obstructive Sleep Apnea
Obstructive sleep apnea is a condition in which people have decreased breathing during their sleep. Untreated sleep apnea has been linked to increased risk for cardiovascular diseases.
This research study is looking at blood clotting factors and blood vessel function in health volunteers and patients with newly diagnosed or untreated obstructive sleep apnea to better understand the underlying mechanisms for increased cardiovascular risk.
研究概览
地位
条件
详细说明
Cardiovascular disease (CVD), which includes strokes, has been the number one killer in the United States.Each year about 700,000 people experience a new or recurrent stroke, which translates into about one stroke every 45 seconds. Apart from traditional risk factors for stroke such as hypertension, smoking and atrial fibrillation, obstructive sleep apnea is now being increasingly recognized as another important treatable risk factor.
The majority of strokes and myocardial infarctions are due to atherothrombotic events. Impaired fibrinolytic activity increases the propensity for thromboembolic events. Many different candidate molecules have been studied as the cause of a hypercoagulable state. Plasminogen Activator Inhibitor-1 (PAI-1) is the major physiologic inhibitor of the body's fibrinolytic system including the principal serine protease tissue-type plasminogen activator (t-PA). It is therefore poised to be a pivotal regulator of the fibrinolytic system.Recent studies have shown that PAI-1 levels are elevated in patients with obstructive sleep apnea (OSA) and that PAI-1 levels correlate with severity of OSA.
The purpose of this pilot study is twofold:
- To characterize changes in the blood levels of plasminogen activator inhibitor-1 (PAI-1) and tissue type plasminogen activator ( t-PA) across the 24 hour cycle in patients with obstructive sleep apnea, as compared to normal controls, and to further identify the pattern of changes with varying severity of obstructive sleep apnea, and
- To study endothelial function in patients with obstructive sleep apnea, as compared to normal controls.
Data gathered from this pilot study will be used to initiate a more comprehensive prospective study exploring the link between OSA, endothelial function, the fibrinolytic system and cardiovascular events. This area can be further explored by prospectively following patients to assess for a reduction in such events with treatment of OSA.
研究类型
注册 (实际的)
联系人和位置
学习地点
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Tennessee
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Nashville、Tennessee、美国、37232
- Vanderbilt University Medical Center,Department of Neurology
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参与标准
资格标准
适合学习的年龄
接受健康志愿者
有资格学习的性别
取样方法
研究人群
描述
Inclusion Criteria:
- Age 18 years or older.
- Subjects are able and willing to provide informed consent.
- Subjects are willing to cooperate with polysomnography and have serial blood draws over a 24-hour period.
- Evidence for OSA (AHI>5 events/hour) without treatment or suspected OSA based on symptoms in the patient group.
- Body mass index of 25-45
Exclusion Criteria:
- History of myocardial infarction, stroke or transient ischemic attack (TIA) or peripheral vascular disease.
- History of chronic diseases such as diabetes mellitus, uncontrolled hypertension (SBP >160, DBP > 120), renal failure on dialysis, cancer, autoimmune or liver disease.
- A significant history of medical or psychiatric disease that may impair participation in the trial.
- Evidence of medical instability (cardiac arrhythmias, congestive heart failure, pulmonary disease) that require an expedited evaluation and treatment of the OSA.
- History of alcohol, or drug abuse during the one-year-period prior to trial participation.
- Current use of tobacco products.
- Current treatment with angiotensin converting enzyme-inhibitors and or chronic use of non-steroidal anti-inflammatory agents.
- Another primary sleep disorder that requires intervention with medications or cause disrupted sleep.
- Patients with unusual sleep or wake habits, including shift work.
- Transmeridian travel in the previous 3 months.
- Patients with OSA who have already received treatment with CPAP, surgery or oral appliance.
- Pregnancy; as hormonal changes affect sleep disordered breathing.
学习计划
研究是如何设计的？
设计细节
队列和干预
团体/队列 |
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Healthy controls
18 years or older with body mass index between 25-45
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Obstructive Sleep Apnea Group
Age 18 years or older with body mass index between 25 and 45
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研究衡量的是什么？
主要结果指标
结果测量 |
大体时间 |
|---|---|
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Comparison of Levels of Mean PAI-1 Activity in Patients With Obstructive Sleep Apnea and Controls.
大体时间：at the initial visit
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at the initial visit
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次要结果测量
结果测量 |
大体时间 |
|---|---|
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Comparison of Endothelial (Blood Vessel) Wall Diameter in Patients With Obstructive Sleep Apnea Versus Controls.
大体时间：at initial visit
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at initial visit
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合作者和调查者
调查人员
- 首席研究员：Kanika Bagai, M.D、Vanderbilt University Medical Center, Nashville, TN
出版物和有用的链接
研究记录日期
研究主要日期
学习开始
初级完成 (实际的)
研究完成 (实际的)
研究注册日期
首次提交
首先提交符合 QC 标准的
首次发布 (估计)
研究记录更新
最后更新发布 (估计)
上次提交的符合 QC 标准的更新
最后验证
更多信息
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