3) Recovery phase The improvement of renal function leads to a gradual reduction of bun and correction of water, electrolytes and acid-base imbalance. The full recovery is depends on the healing of tubular ECs This process may take up three months to one year Unfortunately, not all individuals are restored to health and may become chronic renal failure due to serious damage of the renal tubular ec and the fibrosis of renal tissue 4141 The improvement of renal function leads to a gradual reduction of BUN and correction of water, electrolytes and acid-base imbalance. The full recovery is depends on the healing of tubular ECs. This process may take up three months to one year. Unfortunately, not all individuals are restored to health and may become chronic renal failure due to serious damage of the renal tubular EC and the fibrosis of renal tissue. 3) Recovery phase