Clinical trial NCT02083926: Ketamine Infusion for Social Anxiety Disorder
Official title: Ketamine Infusion for Social Anxiety Disorder
Study type: INTERVENTIONAL
Overall status: COMPLETED
Phase: EARLY_PHASE1
Conditions: Social Anxiety Disorder
Keywords: Social Anxiety Disorder
SAD
Ketamine
Lead sponsor: Yale University
Sponsor class: OTHER
Collaborators: name: Patterson Trust Mentored Research Award: Clinical, Health Services and Policy Research
First posted: 2014-03-11
Enrollment: 18
Sex: ALL
Minimum age (years): 18
Maximum age (years): 65
Standard ages: ADULT
OLDER_ADULT
Accepts healthy volunteers: no
Allocation: RANDOMIZED
Intervention model: CROSSOVER
Primary purpose: TREATMENT

Brief summary: * Social Anxiety Disorder (SAD) is common and causes significant impairment.
* First-line treatments for Social Anxiety Disorder are only partially effective. Many SAD patients experience little or inadequate symptom relief with available treatments.
* Ketamine is a potent NMDA receptor antagonist. Ketamine represents an agent with a potentially novel mechanism of action for the treatment of anxiety disorders.
* Ketamine has demonstrated efficacy in the treatment of psychiatric disorders closely related to Social Anxiety Disorder including Major Depression, Bipolar Depression and possibly Obsessive-Compulsive Disorder.

Ketamine represents the possibility to provide rapid symptom relief to patients with SAD and may provide the mechanism for future drug development to treat SAD more rapidly and effectively.

Detailed description: Roughly one-third to one-half of patients with generalized SAD do not experience significant clinical benefit from current evidence-based treatment for SAD such as pharmacotherapy with selective serotonin reuptake inhibitors (SSRI) or venlafaxine and cognitive behavioral therapy (CBT). Failure of anxiety relief in patients with SAD is a source of substantial morbidity, distress, and decreases in quality of life. Novel pharmacological treatments are needed to improve patient outcomes with SAD.

Converging lines of evidence from neuroimaging and pharmacological studies support the importance of glutamate abnormalities in the pathogenesis of SAD. In a Magnetic Resonance Spectroscopy (MRS) study, an elevated glutamate to creatinine ratio was found in the anterior cingulate cortex of SAD patients when compared to healthy controls. Elevated thalamic glutamine levels have been demonstrated in patients with SAD. Pre-clinical rodent studies have also established a strong link between glutamate regulation and anxiety.

Ketamine is a potent antagonist of the N-methyl-D-aspartate (NMDA) receptor, a major type of glutamate receptor in the brain. Ketamine is routinely used for anesthetic induction because of its dissociative properties. However in research studies, ketamine is effective treatment in reducing symptoms in depressive and possibly anxiety disorders. In multiple controlled clinical studies, ketamine has produced a rapid antidepressant effect in unipolar and bipolar depression. Ketamine's anti-depressant effects peak 1-3 days following infusion. Ketamine's antidepressant effect is observed long after ketamine has been metabolized and excreted by the body and after ketamine's sedative and dissociative effects have dissipated.

The results of several clinical studies suggest that ketamine may also have significant anxiolytic effects. Patients with major depressive disorder given a single ketamine infusion have shown strong and significant reductions in comorbid anxiety symptoms. A trial including 11 depressed patients demonstrated a significant reduction in anxiety symptoms (Hamilton Anxiety Rating Scale (HAM-A)) following ketamine infusion. This improvement is supported by one of the earlier placebo-controlled trials of ketamine which demonstrated that the psychic anxiety item was one of 4 (out of 21) items on the Hamilton Depression Rating Scale (HAM-D) demonstrating significant improvement after ketamine infusion.

The investigators goal is to conduct a randomized, placebo-controlled crossover study to explore the efficacy and time course of action of intravenous ketamine in the treatment of SAD.

Eligibility criteria: Inclusion Criteria:

1. Adult between the ages of 18 and 65 years
2. Meet DSM IV criteria for Social Anxiety Disorder by structured clinical interview (SCID) and have a LSAS \>60 with or without co-morbid MDD

Exclusion Criteria:

1. Positive pregnancy test
2. History of substance abuse disorder within the last 6 months or positive urine toxicology on screening (within the previous 6 months).
3. History of pervasive developmental disorder or psychotic disorder by DSM-IV-TR criteria
4. Medical comorbidity that significantly increases the risks associated with ketamine infusion (e.g. untreated hypertension, significant cardiovascular disease)

Primary outcomes:
measure: Visual Analogue Scale for Anxiety Symptoms (VAS-anxiety)
timeFrame: Day 1 (1+28)
measure: Liebowitz Social Anxiety Score (LSAS)
timeFrame: Day 1 (1+28)
Secondary outcomes:
Other outcomes:
Locations:
city: New Haven
country: United States
facility: Connecticut Mental Health Center
state: Connecticut
Study officials:
affiliation: Yale University
name: Michael H. Bloch, MD, MS
role: PRINCIPAL_INVESTIGATOR
References:
citation: Abdallah CG, Averill LA, Collins KA, Geha P, Schwartz J, Averill C, DeWilde KE, Wong E, Anticevic A, Tang CY, Iosifescu DV, Charney DS, Murrough JW. Ketamine Treatment and Global Brain Connectivity in Major Depression. Neuropsychopharmacology. 2017 May;42(6):1210-1219. doi: 10.1038/npp.2016.186. Epub 2016 Sep 8.
citation: Aitken RC. Measurement of feelings using visual analogue scales. Proc R Soc Med. 1969 Oct;62(10):989-93. doi: 10.1177/003591576906201005. No abstract available.
citation: Davey HM, Barratt AL, Butow PN, Deeks JJ. A one-item question with a Likert or Visual Analog Scale adequately measured current anxiety. J Clin Epidemiol. 2007 Apr;60(4):356-60. doi: 10.1016/j.jclinepi.2006.07.015. Epub 2006 Dec 27.
citation: Freitas-Ferrari MC, Hallak JE, Trzesniak C, Filho AS, Machado-de-Sousa JP, Chagas MH, Nardi AE, Crippa JA. Neuroimaging in social anxiety disorder: a systematic review of the literature. Prog Neuropsychopharmacol Biol Psychiatry. 2010 May 30;34(4):565-80. doi: 10.1016/j.pnpbp.2010.02.028. Epub 2010 Mar 4.
citation: Glue P, Medlicott NJ, Harland S, Neehoff S, Anderson-Fahey B, Le Nedelec M, Gray A, McNaughton N. Ketamine's dose-related effects on anxiety symptoms in patients with treatment refractory anxiety disorders. J Psychopharmacol. 2017 Oct;31(10):1302-1305. doi: 10.1177/0269881117705089. Epub 2017 Apr 26.
citation: Taylor JH, Landeros-Weisenberger A, Coughlin C, Mulqueen J, Johnson JA, Gabriel D, Reed MO, Jakubovski E, Bloch MH. Ketamine for Social Anxiety Disorder: A Randomized, Placebo-Controlled Crossover Trial. Neuropsychopharmacology. 2018 Jan;43(2):325-333. doi: 10.1038/npp.2017.194. Epub 2017 Aug 29.