30
Participants
Start Date
March 31, 2007
Primary Completion Date
May 31, 2008
Study Completion Date
August 31, 2008
sildenafil
50mg 3 times daily for 7 days
hydralazine
25mg 3 times daily for 7 days
placebo
3 times daily for 7 days
University of Edinburgh - Western General Hospital, Edinburgh
University of Edinburgh
OTHER