Table 1.

Numerical scoring system used in the histopathological evaluation of renal ischemia [22]

Grade	Degree of the proximal convoluted tubule necrosis
0	Normal histology
1	Mitoses and necrosis of individual cells
2	Necrosis of individual cells in adjacent proximal convoluted tubules, with survival of surrounding tubules
3	Necrosis confined to the distal third of the proximal convoluted tubule with a band of necrosis extending across the inner cortex
4	Necrosis affecting all three segments of the proximal convoluted tubule

The numerical scoring system for the histopathological evaluation of renal ischemia was first outlined by Jablonski et al. [22]. Histological assessment of kidney slices stained with hematoxylin-eosin was performed by a pathologist under a light microscope. Grade 0 indicates normal proximal convoluted tubule, Grade 4 indicates severly damaged proximal convoluted tubule.