Cause of convulsion in eclampsia:
Eclampsia may develop antepaum,intrapaum or postpaum.It is more common in the last trimester.It may be asymptomatic or preceded by the classical symptoms of prerclampsia.Eclampsia may be associated with the neurological deficit due to cerebral vasospasm and oedema but it usually resolves. TEXT BOOK OF OBSTETRICS,Sheila Balakrishnan,2nd edition,page no.266
Cerebral anoxia due to aerial spasm
Hypovolemia
Hypocalcemia
Shock
Medical, surgical and gynaecological illness complicating pregnancy