Diagnostic Two and Three Dimensional Echocardiography Study Protocol
试验速览
- 阶段
- 不适用
- 状态
- 撤回
- 试验地点
- 1
- 主要终点
- Diagnostic 2D and 3D echocardiography
研究概览
简要总结
The purpose of this study is to perform ground-based research to study what happens to the heart muscle in space. People who have problems with their aortic valve have an increase in the amount of muscle in the left ventricle of the heart. After valve surgery, the amount of muscle should decrease and return to normal. Astronauts lose heart muscle mass during space flight. Our study will look at these changes in your heart, which we believe are similar to what happens during long term space travel.
This study will look at the accuracy of three dimensional ultrasound imaging (echo) in monitoring the changes in heart size and function following aortic valve replacement. We are studying ways to prevent health-related problems that men and women will face on long-duration space missions.
The hypothesis is that serial two dimensional and three dimensional echo will show accurate changes in the left ventricle mass and volume following aortic valve replacement for aortic stenosis or regurgitation
详细描述
Diagnostic Three Dimensional Echocardiography Study Protocol
A. Aims The overall purpose of this study is to perform ground-based research, development, and validation aimed at optimizing diagnostic ultrasound in manned spaceflight, with the following unifying hypothesis: Serial 3D ultrasound examinations will enhance diagnostic capabilities in manned spaceflight.
Specific Aims:
- To optimize acquisition methods for 3D sonography using reconstruction and real-time techniques
- To determine the utility of serial 3D ultrasound examinations in identifying renal calculi and their complications including the development and resolution of hydronephrosis and calyceal dilatation.
- To determine the utility of serial 2D and 3D ultrasound examinations in demonstrating cardiac remodeling (changes in cardiac dimensions, volume, mass and function) and defining its determinants after left ventricular unloading following aortic valve replacement for aortic stenosis or regurgitation.
- To determine whether changes in plasma BNP levels accurately reflect changes in LV mass and volume.
Hypotheses:
研究设计
- 研究类型
- Observational
- 观察模型
- Cohort
- 时间视角
- Prospective
入排标准
- 年龄范围
- 18 Years 至 —（Adult, Older Adult）
- 性别
- All
- 接受健康志愿者
- 否
入选标准
- •Scheduled for surgery for aortic stenosis or aortic regurgitation
排除标准
- •Previous open heart surgery
结局指标
主要结局
Diagnostic 2D and 3D echocardiography
时间窗: 6 - 12 months
次要结局
- BNP levels(6-12 months)
- MRI(6-12 months)