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OBJECTIVE To define the level of nitric oxide (NO) in the spermatic vein of patients with varicocele and its relation with male infertility. METHODS Following physical and color Doppler ultrasonographic examination, whole blood samples were drawn from a peripheral vein and a dilated varicocele vein from fourteen patients with clinically palpable varicocele (G2-3) before ligation. NO levels in the serum were determined as total nitrite by Greiss reaction and results were compared with Mann-Whitney U test. RESULTS NO levels in the internal spermatic vein were 36.05 +/- 8. 92 micromol/l, compared to 19.41 +/- 4.12 micromol/l in the peripheral vein and the difference was statistically significant (p < 0.01). CONCLUSIONS In view of our results, increased NO levels in the dilated varicocele vein might be responsible for spermatozoa dysfunction.
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