CNP and ischemia: CNPase area fraction significantly increased in the ischemia-hypothermia slow rewarming group compared with ischemia-normothermia in the IGWM1, IGWM2, and PVWM (P = 0.003, P < 0.001, P = 0.001, in the IGWM1, IGWM2 and PVWM respectively).