Lipid peroxide and vitamin E patterns in pregnant women with different types of hypertension in pregnancy

OBJECTIVES: We sought to evaluate the circulating levels of lipid peroxides and vitamin E and the placental levels of lipid peroxides in pregnant women with different types of hypertension. STUDY DESIGN: Lipid peroxides were measured in serum and placental tissue by the thiobarbituric acid method and high-pressure liquid chromatography, and vitamin E was measured by high-pressure liquid chromatography. The patients studied were 36 healthy pregnant women and 92 women with hypertension classified as having mild gestational hypertension (n=28), severe gestational hypertension (n=10), preeclampsia (n=34), and chronic hypertension (n=20). RESULTS: Lipid peroxides in serum and placental tissue were significantly increased, and vitamin E levels in serum were significantly decreased in women with severe gestational hypertension and preeclampsia compared with controls. The groups of mild gestational hypertension or chronic hypertension had similar values of lipid peroxides or vitamin E as controls. CONCLUSIONS: Our results suggest that the category of gestational hypertension may be composed of at least two entities with different pathophysiology and support the concept of nonproteinuric preeclampsia.