Second trimester amniotic fluid retinol in patients developing preeclampsia.

BACKGROUND: Retinol (ROH) is an essential micronutrient required for normal fetal development and an essential molecule for antioxidant processes. OBJECTIVE: To investigate the putative role of ROH as a marker of preeclampsia in early second trimester amniotic fluid (AF). MATERIALS AND METHODS: Case-control study comparing the concentration of ROH and other antioxidants such as uric acid, vitamin E and malondialdehyde (MDA) in second trimester AF in patients that later developed preeclampsia with normal pregnancies. RESULTS: The concentration of ROH in amniotic fluids of women that later developed preeclampsia was significantly higher than those of uncomplicated pregnancies (66.72 µg/l (49.00-70.56) vs. 44.4 µg/l (31.9-51.17), p < 0.05). No statistical significant difference was found in uric acid, vitamin E and MDA concentration. In the multivariate logistic regression, concentrations of ROH in amniotic fluids directly correlate with the risk of developing preeclampsia (OR 1.13, IC 0.01-1.26, p < 0.05). CONCLUSIONS: Second trimester AF ROH concentration was significantly higher in pregnancies that developed preeclampsia compared to normal pregnancies.