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Treatment resistant depression (TRD) is a major health concern, with 10% of patients with major depressive disorder not responding to conventional treatments. The investigators propose to compare the MRI (magnetic resonance imaging) brain scans of patients with TRD, which were collected during surgical planning for deep brain stimulation, with age, sex, handedness and education-matched healthy volunteer controls, to investigate anatomical differences, specifically the volume of certain brain structures.
All the patients treated at Frenchay Hospital, UK, with deep brain stimulation (DBS) for treatment resistant depression (TRD) will be given a Patient Information Sheet, and asked if they would like to participate in this research related to their condition. If they indicate they would like to participate, patients will be asked to sign a separate informed consent form (ICF) to give permission for their previously collected MRI scan to be used for this new research purpose. Information on handedness of the patients has not been previously collected, so patients will be given a short questionnaire to determine their handedness. The patients will not be required to perform any further tasks.
For each patient that agrees to participate in the study, two healthy matched control participants will be recruited. Participants will be recruited from an existing volunteer database and by local advertisements.
Respondents interested in participating will be given a letter of invite and a participant information sheet. They will be asked several basic questions including contact details, health status, age, sex, handedness, highest qualification achieved, and scanning requirements in order to assess their basic suitability for the study. If suitable, participants will be invited to attend a screening visit. Here, the informed consent form will be signed, then their medical history will be taken, and they will be given a MINI neuropsychiatric evaluation to assess their physical and mental status. Females who have the possibility of being pregnant will be asked to provide a urine sample to check they are not pregnant, and will be required to use adequate contraception until after their scan.
If suitable, participants will complete two computerised tests of mood. Then they will have a scan date booked at Frenchay hospital. At the scanning visit, participants will be assessed for any changes in health since their screening visit, and then will complete an MRI scan. The same scanner with the same sequences will be used for the healthy controls that were used for the patients. Two sequences will be collected: a coronal T1 FFE (fast field echo) volume acquisition and an axial high resolution T2 limited volume acquisition where 16 slices are collected with 8 above the ACPC (anterior commissure posterior commissure) plane and 8 below. These sequences match the sequences that our DBS patients have had and will allow both automated anatomical quantitative analysis (using Statistical Parametric Mapping version 5 (SPM5)) and quantitative description of other MRI signals such as white matter bright spots. Participants will receive no payment, but can have a printout of their scan if they wish.
The scans will then be analysed and compared to the patient scans.
Observational Model: Case Control, Time Perspective: Cross-Sectional
Bristol Royal Infirmary
University of Bristol
Published on BioPortfolio: 2014-08-27T03:12:12-0400
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