Prediction of Clinical Response to SSRI Treatment in Bipolar Disorder Using Serotonin 1A Receptor PET Imaging

Phase 4

Completed

Conditions: Bipolar Disorder

Interventions: Drug: Fluoxetine
Drug: Citalopram

Registration Number: NCT02473250

Lead Sponsor: New York State Psychiatric Institute

Brief Summary: This study is for subjects with a diagnosis of bipolar disorder who have depression at the time of recruitment. It involves brain imaging with an MRI (magnetic resonance imaging) and PET scan (positron emission tomography) and treatment with an antidepressant. The medication involves adding an SSRI (either celexa/citalopram or prozac/fluoxetine) to a mood stabilizer.

Detailed Description: Bipolar disorder is associated with alterations of chemicals in the brain, including one named serotonin. Treatment of depression in bipolar disorder can be accomplished by increasing serotonin function by medications named selective serotonin reuptake inhibitors (SSRI's). Serotonin signals in the brain occur through receptors in a way that is similar to a lock and key, where serotonin is a key and the receptor is a lock. One important receptor is the serotonin 1A (5-HT1A) receptor. This receptor has been found to be abnormal in bipolar disorder during periods of depression, as measured by a type of brain imaging called positron emission tomography (PET). The amount of brain 5-HT1A receptor measured by imaging has also been associated with how well depressed patients with major depressive disorder respond to an SSRI medication. This project will measure the 5-HT1A receptors in bipolar depressed individuals using PET with the radiotracer \[11C\]-CUMI-101 and will evaluate the ability of this brain imaging signal to predict how patients respond to SSRI treatment when added to a mood stabilizer.

Recruitment & Eligibility

Status: COMPLETED

Sex: All

Target Recruitment: 40

Inclusion Criteria

Ability to provide informed consent
Diagnosis of bipolar I disorder or bipolar II disorder and currently meet criteria for a major depressive episode
Patients who were on psychiatric medication at presentation will have failed that regimen, as defined as not achieving at least partial remission after an adequate dose of medication for at least six weeks.
Depression of sufficient severity to score at least 16 on the first 17 items of the Hamilton Depression Rating Scale
Age range 18-60 years
Females of child-bearing potential must be willing to use an acceptable method of birth control throughout the study.
Subject agrees to discontinue all psychotropic other than those in the PSF and other types of drugs likely to interact with the 5-HT1A receptors.
Subject is likely to tolerate medication cross-taper to monotherapy with a mood stabilizer (valproate, lamotrigine or lithium).

Exclusion Criteria

Diagnosis of any other major psychiatric disorders such as lifetime schizophrenia, schizoaffective disorder, current psychotic depression or current drug or alcohol abuse (within two months before the study) or recent drug or alcohol dependence (within six months before the study); anorexia nervosa or bulimia nervosa within the last year; IV drug use of ecstasy use more than three times. Meet criteria for a manic episode at the time of screening.
Previous failed trial of fluoxetine and citalopram by themselves or in combination with an anti-manic agent, defined as at least six weeks of treatment at the dose of 20 mg per day or more. Failure of two trials of any SSRI or SNRI antidepressant medications.
If the patients are discontinuing medications as part of the washout period or are starting valproate, previous failed trial of mood stabilizer that they will take alone.
Experienced intolerable side effects of both citalopram and fluoxetine in the past. If the subject is not on medications, intolerable side effects of valproate in the past.
History of clinical deterioration when any of the medications that the patient is taking at presentation have been discontinued in the past with the exception of any medications that will be continued during the research protocol.
A first-degree family history of schizophrenia if the subject is less than 33 years old
Significant active physical illness, including blood dyscrasias, lymphomas, hypersplenism, endocrinopathies, renal failure, chronic obstructive lung disease, autonomic neuropathies, peripheral vascular disease, malignancy
Actively suicidal, as defined by expressing ideation with a plan for suicide or develops suicidal ideation that requires immediate medication or treatment intervention.
Pregnancy, abortion or miscarriage in the two months prior to enrollment or plans to conceive during the course of study participation
Lactating women
ECT within the past 6 months
Subjects who endorse a history of prior head trauma and score 1.5 standard deviations below the mean on Trail-making A & B will be excluded from study participation.
Metal implants, pacemaker, metal prostheses, metal orthodontic appliances or shrapnel in the body
Current, past or anticipated exposure to radiation, including:
- Having been badged for radiation exposure in the workplace
- Participation in nuclear medicine protocols in the last year. Subjects will be eligible, however, if the injected dose and dosimetry of the radiotracer are known and the cumulative annual exposure of the previous study and this study is lower than the annual limit for research subjects defined by the FDA (21 CFR 361.1)
History of claustrophobia that would prevent the participation in imaging scans
Current anticoagulant or anti-platelet treatment other than aspirin
Obesity with weight >350 lbs or inability to fit into the MRI scanner

Study & Design

Study Type: INTERVENTIONAL

Study Design: SINGLE_GROUP

Arm && Interventions

Group	Intervention	Description
Bipolar depressed	Citalopram	Bipolar depressed subjects will have neuroimaging and treatment with fluoxetine in combination with a mood stabilizer (valproate)
Bipolar depressed	Fluoxetine	Bipolar depressed subjects will have neuroimaging and treatment with fluoxetine in combination with a mood stabilizer (valproate)

Primary Outcome Measures

Name	Time	Method
Montgomery-Asberg Depression Rating Scale	6 weeks	Depression severity. Minimum=0, Maximum=60. Higher numbers correspond to greater depression severity. The percent change between week 0 and the last observation was calculated.

Secondary Outcome Measures

Name	Time	Method
Hamilton Anxiety Rating Scale	6 weeks	Anxiety severity. Minimum=0, Maximum=56. The larger the value on the scale, the more intense the anxiety. The percent difference between week 0 and the last observation was calculated.
Young Mania Rating Scale	6 weeks	Measure of manic symptoms. Minimum=0, Maximum=60. The higher the value on the scale, the more intense the manic symptoms. The maximum value of YMRS over the six week clinical trial is reported.
Clinical Global Impression-1	6 weeks	General impression of symptoms by clinician. Minimum=1, Maximum=7. The higher value on the scale, the more symptomatic the patient is. The percent difference between week 0 and the last observation was calculated.