Representative electron micrographs, obtained at a magnification of 3000-5000×. A: CLP group, 24 hours after surgery. B: CLP+EP group, 6 hours after surgery. C: CLP+EP group, 12 hours after surgery. D: CLP+EP group, 24 hours after surgery. No obvious differences in mitochondrial shape or the electron-dense matrix were observed between these groups.