Figure 840

Recovery of renal function after relief of complete unilateral ureteral obstruction of variable duration. The recovery of the ipsi-lateral glomerular filtration rate after relief of a unilateral complete ureteral obstruction has been best studied in dogs and depends on the duration of the obstruction. Complete recovery occurs after 1 week of obstruction. The degree of recovery after 2 and 4 weeks of obstruction is only of 58% and 36%, respectively. No recovery occurs after 6 weeks of obstruction [58]. Rare reports of recovery of renal function in patients with longer periods of unilateral ureteral obstruction may represent high-grade partial obstruction rather than complete obstruction or may reflect differences in lymphatic drainage and renal anatomy between the human and canine kidneys [59].

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