Nitric oxide in infertile females in the niger-delta region of Nigeria.

Background: Infertility is a public health challenge and it is a distressing personal tragedy for couples, more so for the female partners. Risk factors and causes of infertility vary from region to region. Reactive species is of current interest in the pathogenesis and management of infertility, especially in the Niger-Delta Region of Nigeria where environmental hazards of oil exploration exists.

Aim: The overall goal of this study was to determine and compare the serum reactive species levels (nitric oxide) in fertile and infertile women attending the infertility clinic at the Delta State University Teaching Hospital, Oghara, and Central Hospital, Warri.

Methods: This was a prospective case-control study in which 70 women evaluated for infertility were recruited into the study. A fertile patient matched for age and body mass index (BMI) attending family planning clinic was selected as control. Serum nitric oxide estimation was done using the BioVision Nitric Oxide Colorimetric Assay Kit. Statistical analysis was performed using the Statistical Package for the Social Sciences (SPSS). Student's t-test was applied to compare the serum levels of nitric acid and the differences were considered significant if P < 0.05.

Results: Infertile women had significantly higher mean serum nitric oxide levels than fertile women: 34.33 (SD 5.93) μmol/L versus 18.27 (SD 2.63) μmol/L (P < 0.001). Women with secondary infertility had significantly higher mean levels of nitric oxide than those with primary infertility: 38.13 (SD 3.39) μmol/L versus 22.72 (SD 4.36) μmol/L (P < 0.001).

Conclusion: The study showed that serum nitric oxide level was significantly elevated in women with infertility compared to women of proven fertility. Hence, oxidative stress from reactive species may be a contributory factor to infertility in women in the Niger-Delta Region of Nigeria.