Cardiac Resynchronization and Iodine Meta-Iodobenzylguanidine (MIBG) Imaging
Cardiac Resynchronization and MIBG Imaging
研究概览
详细说明
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.
研究类型
注册 (实际的)
阶段
- 阶段1
联系人和位置
学习地点
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Minnesota
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Rochester、Minnesota、美国、55905
- Mayo Clinic in Rochester
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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
描述
Inclusion criteria: Indications for Biv-ICD implantation
- Chronic moderate to severe congestive heart failure (CHF) (NYHA class II or IV)
- Left ventricular ejection fraction (LVEF) of 35% or less
- Q wave, R wave and S wave (QRS complex) QRS duration of 120 ms or more
- On optimized anti-heart failure medical regimen
Meet one of the following indications for ICD
- Survivors of cardiac arrest due to ventricular fibrillation (VF) or ventricular tachycardia (VT) or spontaneous sustained VT
- Nonsustained VT with coronary disease, prior myocardial infarction, LVEF 35% or less, and inducible VF or sustained VT at electrophysiologic study
- LVEF of 30% or less with severe coronary artery disease
Exclusion criteria:
- Patient condition is unstable
- Patient is unable to give informed consent
- Not feasible for patient to be followed at Mayo Clinic
- Female in pregnancy and breast feeding
学习计划
研究是如何设计的？
设计细节
- 主要用途：治疗
- 分配：不适用
- 介入模型：单组作业
- 屏蔽：无（打开标签）
武器和干预
参与者组/臂 |
干预/治疗 |
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实验性的：Biv-ICD
Subjects will be imaged with 123 iodine metaiodobenzylguanidine.
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10 millicurie (mCi) (370 MBq)
其他名称：
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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 |
|---|---|---|
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Change in 123I-MIBG parameters
大体时间：baseline, 6 months
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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
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baseline, 6 months
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次要结果测量
结果测量 |
措施说明 |
大体时间 |
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Change in submaximal exercise gas exchange
大体时间：baseline, 6 months
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Subjects will perform simplified low intensity cardiopulmonary exercise testing in our laboratory where they breathe for 1 min at rest, perform graded step exercise, increasing from 60, 90, 120 steps per minute until achieving a perceived exertion of 12-14 on the 6-20 Borg scale.
This will be followed by a 1 min recovery.
Subjects will be instrumented with ECG, pulse oximeter and breathe on a mouthpiece where ventilation, oxygen and carbon dioxide are measured continuously to calculate the desired parameters of ventilatory efficiency (VE/VCO2), PetCO2 and oxygen pulse (O2Pulse) on a breath by breath basis.
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baseline, 6 months
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Change in Autonomic function
大体时间：baseline, 6 months
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In addition to the simplified submaximal step test, subjects will also perform a simplified battery of tests for autonomic function.
This will include supine to upright measures of heart rate and heart rate variability (HRV), paced breathing (slow to faster frequencies) as well as tracking HRV and responses to the increased metabolic demands of exercise and into recovery.
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baseline, 6 months
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合作者和调查者
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
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.