The effect of allopurinol pretreatment before detorting testicular torsion.

The resumption of blood flow to organs following ischemia may cause a further increase in tissue damage through an increase in peroxidation of lipids in cell membranes. An experimental study was conducted to investigate the prevention of reperfusion injury after testicular torsion through changes in the lipid peroxide content of the testis. Adult male albino rats were divided into 11 groups, each containing 10 rats. One group served to determine base values of the lipid peroxide content of the testis and kidney; 3 groups were subjected to unilateral testicular torsion lasting 1, 3 and 5 hours; 3 groups were subjected to detorsion following torsion lasting 1, 3 and 5 hours; 3 groups were treated with allopurinol before detorsion following torsion lasting 1, 3 and 5 hours; and 1 group underwent sham operation as a control. Thiobarbituric acid reactive products of lipid peroxidation (TBAR) were assessed in testicular and renal tissues. Testicular torsion caused a significant increase in TBAR in the testis (p < 0.01), but not in the kidneys. Detorsion caused a further significant increase in testicular TBAR (p < 0.01). Pretreatment with allopurinol prevented this further increase (p < 0.01). It is concluded that, biochemically, reperfusion injury occurs in the testis following detorsion after testicular torsion of 720 degrees lasting as long as 5 hours. Pretreatment with allopurinol before detorsion prevents such reperfusion injury.