50
Participants
Start Date
January 31, 2017
Primary Completion Date
December 31, 2017
Study Completion Date
December 31, 2017
Mild Hypoxia Preconditioning
Patients will be treated with mild hypoxia ( Note: The oxygen concentration decreased from 20% to 18%, and keeping at 18%)×7 days，twice a day in the morning and in the afternoon before surgery.
Sham preconditioning
Patients will be treated with sham preconditioning (oxygen concentration: 21％) ×7 days，twice a day in the morning and in the afternoon before surgery.
Tianjin HuanHu Hospital, Tianjin
Hua Yan
OTHER