Remote ischemic preconditioning significantly attenuated the release of urinary insulinlike growth factor-binding protein 7 and tissue inhibitor of metalloproteinases 2 after surgery ( remote ischemic preconditioning , 0.36 vs control , 0.97 ng/mL2/1000 ; difference , 0.61 ; 95 % CI , 0.27-0 .86 ; P < .001 ) .