question: Compared to no helium what was the result of Helium preconditioning (3 × 5 min of 70 % helium and 30 % oxygen) was applied before aortic cross clamping; postconditioning (15 min of helium) was applied before release of the aortic cross clamp. on activation of p38 MAPK, ERK 1/2 or levels of HSP27 and PKC-? in the human heart?
context: Data are presented as mean ± SD; no significant differences were observed between groups