90
Participants
Start Date
July 31, 2011
Primary Completion Date
December 31, 2011
Study Completion Date
December 31, 2011
leg elevation
bilateral passive leg elevation for 30 seconds
Trendelenburg position
Trendelenburg position (15 degrees) for 30 seconds
Trendelenburg position + passive leg elevation
Trendelenburg position + passive leg elevation
control group
supine position without passive leg elevation or trendelenburg position
Samsung Medical Center, Seoul
Samsung Medical Center
OTHER