Magnetic resonance imaging in the early diagnosis of cavernous sinus thrombosis

The pathophysiology of preeclampsia has not been fully clarified. A variety of factors have been implicated with this disease including vasoactive peptides and hormones during the last 20 years. Inadequate generation of atrial natriuretic peptide (ANP) has been one of the mechanisms discussed as to possibly contribute to the development of hypertension. In human pregnancy multiple studies of ANP-plasma-concentration in normal or hypertensive pregnancies showed conflicting results. The complexity of the clinical findings of hypertension in pregnancy makes it very difficult to carry out comparative clinical and biochemical studies in humans. In an animal experience genetic as environmental influences could be excluded. Therefore, the present study shows an experimental preeclampsia-like syndrome in the rat by reduction of the utero-placental flow. We observed a significant increase of plasma ANP in pregnant rats with experimentally induced hypertension. Furthermore, our results suggest that the ventricles could be an important source of ANP gene expression.