Acute development of oligohydramnios in a pregnancy complicated by chronic hypertension and superimposed pre-eclampsia.

Perinatal mortality is significantly increased in pregnancies where pre-eclampsia is superimposed on chronic hypertension. Oligohydramnios and intrauterine growth retardation are common in this setting. Although oligohydramnios generally has been assumed to occur gradually the following report pertains to a case of a rapid development of oligohydramnios.