RCT－流程图

Allocated to Cryo/Cuff group (n=50)

loss of follow-up (n=0)

Allocated to control group (n=50)

Clinical assessment at research location(n=100)

Analysis (n=50)

Excluded (n=27) Rufused to participate (n=10) Not meeting inclusion criteria (n=7) Lower limb thrombosis preoperatively (n=4) Intraoperative changes in anesthesia (n=3) Preoperative history of anemia (n=2) Transit to ICU postoperative (n=1)

Analysis (n=48)

EnrollmentAssessed for eligibility(n=127)

Randomized (n=100)

loss of follow-up (n=0)unwilling to continue (n=2)