Cardiac Resynchronization and MIBG Imaging
试验速览
- 阶段
- 1 期
- 状态
- 终止
- 发起方
- Mayo Clinic
- 入组人数
- 14
- 试验地点
- 1
- 主要终点
- Change in 123I-MIBG parameters
研究概览
简要总结
Subjects were recruited if their healthcare provider decided that they needed treatment with a special Internal Cardiac Defibrillator (ICD) called a biventricular ICD. The investigators did this study to see if part of the nerve organ, called the sympathetic nervous system, may be responsible for the improvement seen in patients that receive biventricular pacing. The investigators had three ways to measure sympathetic nervous activity: 1) by using a special blood sample, 2) by monitoring heart rhythm, and 3) by performing a special heart scan.
详细描述
The Specific Aim #1 of this study is to assess, with 123iodine metaiodobenzylguanidine (123I-MIBG imaging), whether cardiac resynchronization therapy (CRT) rebalances and improves the integrity and function of sympathetic nerve terminals in the failing myocardium. The study will test the hypothesis that resynchronization of biventricular contractility attenuates excessive sympathetic drive, and improves autonomic function and cardiac performance.
The Specific Aim #2 of this study is to determine the relationship between 123I-MIBG labeling of sympathetic activity and physiological measures of cardiopulmonary and autonomic function. This aim is to test the hypothesis that impaired cardiac sympathetic activity, determined by 123I-MIBG imaging will be associated with poorer submaximal exercise gas exchange (higher ventilation - carbon dioxide (CO2) slopes, low end tidal CO2, reduced oxygen pulse and a more rapid frequency response) as well as reduced heart rate power spectral frequencies, a blunted response to positional changes and a delayed heart rate recovery.
研究设计
- 研究类型
- Interventional
- 分配方式
- Na
- 干预模型
- Single Group
- 主要目的
- Treatment
- 盲法
- None
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
- 未提供
排除标准
- 未提供
研究组 & 干预措施
Biv-ICD
Subjects will be imaged with 123 iodine metaiodobenzylguanidine.
干预措施: 123 iodine metaiodobenzylguanidine (Drug)
结局指标
主要结局
Change in 123I-MIBG parameters
时间窗: baseline, 6 months
changes in 123I-MIBG parameters with cardiac performance including LVEF, stroke volume (SV), left ventricle (LV) and left atrium (LA) dimension, distance of 6-minute walk, NYHA class, and ventricular arrhythmic burden
次要结局
- Change in submaximal exercise gas exchange(baseline, 6 months)
- Change in Autonomic function(baseline, 6 months)