Warfarin and Coronary Calcification Project (WACC)
2012年8月23日 更新者：Todd C. Villines、Walter Reed Army Medical Center
The purpose of the study is to assess whether the use of warfarin, a commonly used anticoagulation drug, is associated with increased amounts of coronary artery calcification.
Studies in animals and preliminary but small retrospective studies in humans have suggested a possible link to increased tissue calcification with use of this drug.
The researchers will investigate this by assessing the amount of calcification seen in the coronary arteries using a specialized computed tomography (CT) scan (electron-beam CT) and assessing to see if the amount is influenced by the amount of time a patient has been taking warfarin.
The researchers will exclude patients with known coronary artery disease, chronic kidney disease or hyperparathyroidism.
研究概览
地位
完全的
条件
研究类型
观察性的
注册 (实际的)
70
联系人和位置
本节提供了进行研究的人员的详细联系信息，以及有关进行该研究的地点的信息。
学习地点
-
-
District of Columbia
-
Washington、District of Columbia、美国、20307
- Walter Reed Army Medical Center
-
-
参与标准
研究人员寻找符合特定描述的人，称为资格标准。这些标准的一些例子是一个人的一般健康状况或先前的治疗。
资格标准
适合学习的年龄
18年 及以上 (成人、年长者)
接受健康志愿者
不
有资格学习的性别
全部
取样方法
非概率样本
研究人群
Patients without known coronary heart disease, disorders of calcium metabolism or chronic kidney disease aged > 18 years who are referred to take or currently taking warfarin and are followed in the Anticoagulation Management Clinic at Walter Reed Army Medical Center (WRAMC).
描述
Inclusion Criteria:
- Age 18 years of age or older
- Patients referred to begin or already treated with warfarin anticoagulation therapy.
Exclusion Criteria:
- Known prior myocardial infarction or coronary heart disease
- History of advanced chronic kidney disease manifested by serum creatinine>2 or calculated glomerular filtration rate (GFR)<30
- History of hyperparathyroidism
- Current hypercalcemia
- Current hyperphosphatemia
- Uncertain duration of warfarin therapy
- Lack of records documenting international normalized ratio (INR) during therapy
学习计划
本节提供研究计划的详细信息，包括研究的设计方式和研究的衡量标准。
研究是如何设计的？
设计细节
队列和干预
团体/队列 |
|---|
|
1
Warfarin use < 6 months
|
|
2
Warfarin use 6-24 months
|
|
3
Warfarin use >24 months
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研究衡量的是什么？
主要结果指标
结果测量 |
措施说明 |
大体时间 |
|---|---|---|
|
Coronary Calcification (Presence and Degree as Measured by Agatston Score) Attributed to Duration of Warfarin Use in Months After Controlling for Standard Cardiovascular Risk Factors to Include the Framingham Risk Score
大体时间：EBCT scan is done at time of enrollment of patient into 1 of 3 groups based on warfarin use duration: <6 months; 6-24 months; >24 mos.
|
The Agatston score is calculated using a non-contrast computed tomography (CT) scan to measure for the presence and severity of coronary artery disease through identification of calcification in the coronary arteries.
Scores can range from 0 to several thousands.
The measure is without units.
Score categories are as follows: 0 = no coronary disease; 1-100 = low amount of coronary artery disease; 101-400 = moderately elevated score / moderate coronary artery disease; 401-1000 = severely elevated score; >1000 very severely elevated score.
Higher Agatston scores corelate with more coronary artery disease and predict a higher risk of coronary heart disease events and mortality.
|
EBCT scan is done at time of enrollment of patient into 1 of 3 groups based on warfarin use duration: <6 months; 6-24 months; >24 mos.
|
次要结果测量
结果测量 |
措施说明 |
大体时间 |
|---|---|---|
|
International Normalized Ratio
大体时间：EBCT scan is done at time of enrollment of patient into 1 of 3 groups based on warfarin use duration: <6 months; 6-24 months; >24 mos.
|
The International Normalized Ratio (INR) is a standardized lab value that measures the intensity of anticogulation using warfarin.
It is used to monitor patients taking warfarin.
|
EBCT scan is done at time of enrollment of patient into 1 of 3 groups based on warfarin use duration: <6 months; 6-24 months; >24 mos.
|
合作者和调查者
在这里您可以找到参与这项研究的人员和组织。
出版物和有用的链接
负责输入研究信息的人员自愿提供这些出版物。这些可能与研究有关。
有用的网址
研究记录日期
这些日期跟踪向 ClinicalTrials.gov 提交研究记录和摘要结果的进度。研究记录和报告的结果由国家医学图书馆 (NLM) 审查，以确保它们在发布到公共网站之前符合特定的质量控制标准。
研究主要日期
学习开始
2004年5月1日
初级完成 (实际的)
2010年1月1日
研究完成 (实际的)
2010年1月1日
研究注册日期
首次提交
2009年3月24日
首先提交符合 QC 标准的
2009年3月24日
首次发布 (估计)
2009年3月25日
研究记录更新
最后更新发布 (估计)
2012年8月24日
上次提交的符合 QC 标准的更新
2012年8月23日
最后验证
2012年8月1日
更多信息
此信息直接从 clinicaltrials.gov 网站检索，没有任何更改。如果您有任何更改、删除或更新研究详细信息的请求，请联系 register@clinicaltrials.gov. clinicaltrials.gov 上实施更改，我们的网站上也会自动更新.