Decreased first trimester uric acid production in future preeclamptic patients.

The relationship between first trimester uric acid production and later development of pregnancy induced hypertensive disorders (PIHD) was investigated. An anti-oxidant role for uric acid has been mentioned. Since uric acid and fibronectin (PF) are both markers of preeclampsia, the relationship between these two substances was also studied. Controls (n = 72) and patients with PIHD (n = 120) were selected. Uric acid was measured in serum and 24-hours urine samples (uric acid excretion) and PF in blood plasma in 270 nulliparous women at 13 +/- 2 weeks of gestation. Uric acid excretion was significantly lower in the first trimester in a group of patients who later develop PIHD as compared to patients who remain normotensive (p < 0.05), especially when corrected for body weight (p < 0.01). Patients with elevated PF levels in the first trimester showed a significantly lower uric acid excretion than patients with normal PF levels (p < 0.05). The data show diminished uric acid production in patients who will likely develop preeclampsia suggesting an impaired anti-oxidant production in the first trimester. This observation fits well with the hypothesis that an imbalance between anti-oxidant and oxidants plays an important role in the pathogenesis of preeclampsia.