Vitamin D, Steroids, and Asthma in African American Youth (AsthMaP2)
AsthMaP 2: Vitamin D, Steroids, and Asthma in African American Youth
Asthma has become considerably more prevalent and severe in the U.S. during the last 40 years, particularly affecting youth in urban areas, yet the reasons for this are not clear. There is increasing evidence that vitamin D insufficiency contributes to more severe asthma through increased risk of respiratory infections and decreased sensitivity to glucocorticoids. Indeed, low vitamin D levels are linked with the need for exogenous glucocorticoids and increased asthma severity. Particularly relevant to health disparities, we showed a strong association between vitamin D insufficiency and asthma in urban African American (AA) youth. Importantly, AA youth in ours and other studies had lower vitamin D levels than non-AA participants.
Because AA youth residing in urban Washington, DC have markedly worse asthma than other racial/ethnic groups (e.g. prevalence rate 20% higher than the national rate 15 and emergency department utilization rates up to 5 times the national rates and nearly 10 times the Healthy People 2010 target rate), we will utilize our access to this population at the extreme of asthma disparities to examine the contribution of vitamin D to disparities in the chronic control and acute severity of asthma. The overall goal of this study is to provide critical epidemiological/molecular information that will inform the interpretation of ongoing and impending randomized clinical trials of vitamin D supplementation in asthma, especially with regard to urban AA youth with asthma. We hypothesize that low serum 25-hydroxyvitamin D [25(OH)D] levels are associated with poor chronic asthma control, worse acute asthma severity, and glucocorticoid insensitivity. The knowledge generated by the experiments in this application will be crucial to translation of this inexpensive, easily-accessible, and thereby potentially disparity-reducing prospective therapy for asthma.
研究概览
研究类型
注册 (实际的)
联系人和位置
学习地点
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District of Columbia
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Washington、District of Columbia、美国、20010
- Children's National Medical Center
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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:
- Between 6 and 20 years of age
- Physician-diagnosed asthma for 1 year or more
- Caretaker/Independent participant willing to sign the written Informed Consent, Assent form when appropriate
Exclusion Criteria:
- Significant, chronic medical illnesses other than asthma
- No access to a phone
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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Phenotypic Clusters
500 urban youth
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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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Serum 25(OH)D measurement by liquid chromatography-tandem mass spectrometry
大体时间:one year
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one year
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合作者和调查者
调查人员
- 首席研究员:Robert J Freishtat, MD, MPH、Children's National Research Institute
出版物和有用的链接
有用的网址
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 (实际的)
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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