Ozone Cardiovascular Effects in Genetically Susceptible People
试验速览
- 阶段
- 不适用
- 状态
- 已完成
- 入组人数
- 80
- 试验地点
- 2
- 主要终点
- Nitric oxide bioavailability
研究概览
简要总结
Increases in air pollution are associated with increases in deaths from cardiovascular disease, but the investigators know little about how ozone air pollution affects the cardiovascular system. The investigators proposed study will determine the effects of ozone on blood vessel and heart function that could worsen illness in people with underlying heart disease. This will be accomplished by studying healthy volunteers who inhale ozone in a controlled clinical study, and also by studying their exposure to ozone and other pollutants during their normal daily activities. The investigators will study volunteers who may be at increased risk for the effects of ozone because of genetic susceptibility. Understanding the effects of ozone on the heart and circulation can help establish appropriate air pollution standards, and provide strategies to protect the most susceptible people.
研究设计
- 研究类型
- Interventional
- 分配方式
- Randomized
- 干预模型
- Crossover
- 盲法
- Double (Participant, Investigator)
入排标准
- 年龄范围
- 18 Years 至 40 Years（Adult）
- 性别
- All
- 接受健康志愿者
- 是
入选标准
- •Never-smokers with normal spirometry based on the standards published by Morris and co-workers (Morris et al. 1971), and
- •A normal electrocardiogram. -
排除标准
- •Any history of habitual smoking.
- •Marijuana smoking within the past 5 years.
- •Pregnancy.
- •Any history of significant organ impairment, chronic respiratory disease, ischemic heart disease, active psychiatric disorder or current drug or alcohol abuse.
- •Occupation involving regular, heavy dust or particle exposure, such as welding, mining, foundry work.
- •FEV1 < 75% of predicted at baseline screening.
- •Subjects with atopy or allergic rhinitis will not be excluded as long as they do not require regular treatment with antihistamines or systemic steroids.
- •Subjects on certain prescription medications such as prednisone or statins will be excluded. Use of other medications will be considered on an individual basis. Subjects will not be asked to discontinue prescription medications for the purposes of this study.
- •Hypertension (blood pressure higher than 140/90 mmHg or on antihypertensive medication).
- •Subject lives outside the Rochester metropolitan area.
结局指标
主要结局
Nitric oxide bioavailability
时间窗: Before and 3 hours after ozone exposure
We hypothesize that systemic vascular effects of exposure to ozone will be reflected in reductions in arterial blood nitrite or its A/V gradient. This will require simultaneous collection of venous and arterial blood.
次要结局
- Evidence of endothelial injury(Before and 3 hours after ozone exposure)
研究者
Mark Frampton
Professor
University of Rochester