The Serotonin Transporter Gene Polymorphism and Major Depression Following Traumatic Brain Injury
试验速览
- 阶段
- 4 期
- 状态
- 已完成
- 入组人数
- 200
- 试验地点
- 2
- 主要终点
- - Hamilton Depression Rating Scale (HAM-D)
研究概览
简要总结
Problem: Depressive symptoms are a common mental health problem following traumatic brain injury (TBI), occurring in up to 87% of patients. Depression following TBI has important consequences including poor functioning, lack of ability to return to work and family activities and prolonged TBI symptoms. The reason depression develops in some patients following TBI is unknown, making treatment difficult.
One type of brain protein that shows genetic differences between people is called the serotonin transporter. People can be divided by whether or not they have a short protein (S allele) or a long protein (L allele) which influences the amount of serotonin transporter. Serotonin is a key brain chemical in depression in many mental/psychiatric illnesses. We think that the genetic differences in the serotonin transporter, that may not make a difference before TBI, may become important after TBI due to the nature of these injuries.
Methods: A consecutive sample of 200 patients attending a TBI clinic who have sustained a mild-to-moderate TBI (American Congress of Rehabilitation Medicine criteria) within the last 2 months will be assessed for the presence of major depression (standard criteria, standardized interview). In phase I, blood samples from patients with mild-to-moderate TBI with depression and without depression will be checked for the presence of the 5-HTTPR genetic difference. This will allow us to study if the S allele is more likely in TBI patients with depression. In phase II, the patients with depression will be treated with the SSRI citalopram for 6 weeks. At 6 weeks, or upon discontinuation of citalopram, depression will be assessed again. This will allow us to study if depressed patients with the S allele respond more poorly to treatment. Persons assessing depression after treatment will not know the genetic makeup of each patient.
Results Expected: If the serotonin transporter genetic difference confers susceptibility to depression following TBI, this will provide important information on what causes depression following TBI and document a risk factor for depression previously unstudied in this population. Also, as SSRI antidepressants are used to treat depression in TBI, this study may identify a subgroup of TBI patients in whom different medications should be given or additional medications are required.
研究设计
- 研究类型
- Interventional
- 分配方式
- Non Randomized
- 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
- •age >18 years
- •gender: male or female
- •TBI within the last two months
- •mild to moderate TBI
- •written, informed consent
- •depressed group only: diagnosis of major depressive episode using the depression module of the Structured Clinical Interview for the DSM-IV (SCID-IV)
排除标准
- •prior TBI or other focal brain disease (stroke, tumor)
- •significant acute medical illness, including: drug overdose, severely disturbed liver, kidney, lung, or heart function, anemia, hypothyroidism, uncontrolled diabetes, Parkinson's disease, Huntington's chorea, progressive supranuclear paralysis, brain tumor, subdural hematoma, multiple sclerosis
- •a brain CT scan revealing focal lesions that could not be interpreted as consistent with a TBI
- •depression group only: contraindications to receiving treatment with citalopram
结局指标
主要结局
- Hamilton Depression Rating Scale (HAM-D)
时间窗: Baseline, 6 weeks and 10 weeks (if applicable)
次要结局
- Beck Depression Inventory (BDI), Rivermead Head Injury Follow-up Questionnaire (RHFQ), General Health Questionnaire (GHQ), Rivermead Post Concussion Disorder Questionnaire (RPDQ)(Baseline, 6 weeks and 10 weeks (if applicable))