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Clinical Trial Summary

This study is a 7-day randomized, double-blind proof-of-concept pilot study of nitrous oxide vs. midazolam in 40 adults (20-60 years) with bipolar disorder (BD) (type I or II). Ongoing pharmacological and psychosocial treatments may continue, provided that they have not been initiated or significantly modified in the preceding 2 weeks. Participants' current treatment as prescribed by clinical psychiatrists will not be modified or interfered in this study. The study involves 3 visits. During study visit 1, participants will complete screening to ensure study eligibility. This will be done using interview measures. During study visit 2, participants will complete anthropomorphic measurements, measurement of endothelial function, screening blood work, ECGs, and an anaesthesia screener. During study visit 3, participants will receive the treatment (nitrous oxide or midazolam), complete an MRI scan, and complete interview measures and self-reports. There will be anthropomorphic measurements taken as well. The participant will be required to complete phone interviews and self-reports over the subsequent 7 days. There are 4 main predictions: 1. Nitrous oxide will significantly reduce depression symptoms vs. midazolam. 2. Nitrous oxide will significantly increase frontal cortical perfusion vs. midazolam. 3. Lower perfusion in frontal cortical regions at baseline will be associated with greater improvement in depression symptoms following nitrous oxide treatment. 4. Poorer endothelial function will be associated with greater improvement in depression symptoms following nitrous oxide treatment.


Clinical Trial Description

n/a


Study Design


Related Conditions & MeSH terms


NCT number NCT02351869
Study type Interventional
Source Sunnybrook Health Sciences Centre
Contact
Status Terminated
Phase Phase 2
Start date August 2015
Completion date June 7, 2020

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