Aetiological aspects of febrile convulsions. Pregnancy and perinatal factors.

The birth histories of 132 patients admitted to hospital with convulsions in association with febrile illnesses are compared with those of 180 of their sibs. Patients experienced significantly more often threatened abortion, maternal medication during pregnancy, caesarean section, and moderately low birthweight. Male patients had a significant increase in fetal distress, and, in specified circumstances, in neonatal feeding difficulties. Female patients were born significantly more often to very young or elderly mothers. At least one significant factor was recorded in 61% of patients. It is concluded that an abnormal pregnancy or birth history predisposes to febrile convulsions.