Early stage of renal ischaemia causes renal tubular necrosis which is reversible. Later on , irreversible cortical necrosis occurs. Acute constant severe abdominal pain which may be localised or diffuse. Dark vaginal bleeding results from escape of blood from the retroplacental haematoma. Cessation of foetal movement is common.
Foetal parts are difficult to be felt.
FHS may be absent due to foetal death in severe cases or distressed in mild cases. If the cervix is dilated the placenta is not felt. Other causes of antepartum haemorrhage. Other causes of acute abdomen. The same as in placenta praevia.