180
Participants
Start Date
August 31, 2007
Primary Completion Date
May 31, 2009
Study Completion Date
October 31, 2009
Sildenafil Citrate
Sildenafil citrate (20mg 3 times a day \[TID\] orally for 12 weeks followed by 20mg TID open-label sildenafil for an additional 12 weeks)
Placebo
Placebo (20mg TID orally for 12 weeks followed by 20mg open-label sildenafil for 12 weeks)
Weill Medical College of Cornell University, New York
Duke University Medical Center, Durham
Emory University, Atlanta
University of Alabama - Birmingham, Birmingham
Vanderbilt University, Nashville
University of Michigan, Ann Arbor
Mayo Clinic, Rochester
University of Chicago, Chicago
Tulane University, New Orleans
National Jewish Medical and Research Center, Denver
University of California - Los Angeles, Los Angeles
University of California - San Francisco, San Francisco
University of Washington, Seattle
Lead Sponsor
Collaborators (1)
National Heart, Lung, and Blood Institute (NHLBI)
NIH
Pfizer
INDUSTRY
Duke University
OTHER