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Effect on low implantation of the placenta on maternal blood pressure and placental function

Summary. Low implantation of the placenta may protect against the development of pregnancy‐induced hypertension (PIH) and is associated with improved values in tests of placental function. PIH occurred in six of 201 (3%) consecutive patients with placenta praevia managed at the City Hospital, Nottingham, from 1 April 1973 to 30 June 1981. None of the six patients developed associated proteinuria. Of the total number of 24549 patients delivered in the same hospital for the years 1974–1978, 3744 (15%) developed PIH. Of the patients with placenta praevia, 52% had serum levels of human placental lactogen above the 95th centile and 25% had 24–h urinary oestriol levels above the 95th centile. The birthweight distribution was not different from that of the total live births at the City Hospital, Nottingham (based on 1975–1976 deliveries).