PET-study on the Role of the Reward System in Weight Loss After Bariatric Surgery
试验速览
- 阶段
- 不适用
- 状态
- 招募中
- 入组人数
- 30
- 试验地点
- 2
- 主要终点
- Change in [11C]-raclopride binding potential in the brain's reward system between study groups before and after a food challenge.
研究概览
简要总结
Bariatric surgery (BS) is currently the most effective treatment in severe obesity. However, a considerable percentage of patients undergoing BS fail to lose sufficient weight or regain weight after initial weight loss during long-term follow-up, which may be attributed to personality traits and pathological eating behaviour. Previous positron emission tomography (PET) studies have shown reduced dopamine D2 receptor availability in obese patients and upregulation of this availability following successful BS in the brain's reward system. Dopamine D2 receptor availability in patients with unsuccessful BS has not been investigated to date.
研究设计
- 研究类型
- Interventional
- 分配方式
- Non Randomized
- 干预模型
- Parallel
- 主要目的
- Other
- 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
- •Bariatric surgery 24-36 months prior to the study
- •Adult (over 18y old)
- •Mentally capable to understand the consequences of the procedure and make his or her own choice without coercion
- •Able to undergo PET and MRI, according to the investigator's assessment
- •Native speaking
- •Able to participate in follow-up
- •Written informed consent
排除标准
- •Presence of a DSM-IV axis 1 disorder
- •The use of drugs that bind to dopamine D2/3 receptors, including various classes of antipsychotics and antidepressants
- •History of stroke, brain tumor, Parkinson's Disease or dementia
- •History of head trauma with loss of consciousness
- •Alcohol or substance abuse in the last 6 months
- •Alcohol consumption 24h prior to PET scanning
- •Smoking or other forms of nicotine intake 12 hours prior to PET scanning
- •Use of anorectic drugs in the last 6 months
- •Current pregnancy
- •Medication for Diabetes Mellitus
- •Claustrophobia
- •The presence of implanted metal objects of the type which may concentrate radiofrequency fields or cause tissue damage from twisting in a magnetic field (such as certain implanted devices, shrapnel, ocular metal shavings)
- •Patients with a bodyweight > 200kg will be excluded to ensure the maximum load of the camera bed of the PET-scanner (227 kg) is not exceeded.
结局指标
主要结局
Change in [11C]-raclopride binding potential in the brain's reward system between study groups before and after a food challenge.
时间窗: -50 minutes (before start of PET scanning), 0 minutes (during PET break, before mixed meal), 30 minutes (after second phase of PET-scanning)
Pre- and post-eating changes in dopamine D2 receptor availability as indexed by the \[11C\]-raclopride binding potential in the brain's reward system between subjects who underwent successful vs unsuccessful bariatric surgery
次要结局
- The correlation between [11C]-raclopride binding potential in the brain's reward system and of questionnaires and diaries(Pre-intervention)
- The correlation between [11C]-raclopride binding potential in the brain's reward system and of gut hormones.(-50 minutes (before start of PET scanning), 0 minutes (during PET break, before mixed meal), 30 minutes (after second phase of PET-scanning), 60 - 90 - 120 minutes)