Table 1.

Morphological alterations in the kidneys, depending on the time of ischemia.

15 Min of Ischemia	25 Min of Ischemia and 120 Min after Blood Reflow	60 Min of Ischemia and 120 Min after Blood Reflow
Insignificant black leak Minimal invertible injury to tubular cells No evolution changes to necrosis	Modest back leak Expansion of cell injury to necrosis in single cells, but convoluted proximal tubules are not involved	Severe black leak Necrosis in convoluted and straight proximal tubular cells, irreparable cell injury, and necrotic cells and sporadic areas of the tubular basement membrane are stripped of epithelium