21
Participants
Start Date
November 30, 2012
Primary Completion Date
April 30, 2015
Study Completion Date
April 30, 2015
Nitrous Oxide
"Patients will receive either up to 50% nitrous oxide/50% oxygen for 1 hour or placebo (50% nitrogen \[inert\]/50% oxygen) in two separate sessions. Both sessions will be 1 week apart."
Placebo
50% nitrogen \[inert\]/50% oxygen - otherwise completely identical administration and setup
Barnes-Jewish Hospital, St Louis
Washington University School of Medicine
OTHER