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Febrile and Nocturnal Convulsions in Monozygotic Twins

1 This study comprises 24 pairs of monozygotic twins: 19 pairs, one or both with febrile convulsions, and 5 pairs, one or both with nocturnal convulsions. The findings indicate a genetic relation of febrile and of nocturnal convulsions. When FC twins had the same mental development, concordance for seizures was 1000%, for febrile seizures 80% 20% had nocturnal seizures. When one twin had a much lower I.Q., he had febrile convulsions and the normal twin could have no convulsions or febrile or nocturnal convulsions. 2 In support of this conclusion the histories of 70 children with febrile convulsions suggested that the convulsions occurred in relation to sleep, either during sleep (50%) or just before or after sleep, in 70%. 3 The incidence of convulsions in the relatives of FC twins supports the view that susceptibility to febrile convulsions is transmitted by a single dominant gene with incomplete penetrance. The specific trait, susceptibility to febrile convulsions, is related to susceptibility to nocturnal and single convulsions. The incidence of epilepsy in the relatives of twins with febrile and nocturnal convulsions is 5/1000, as in the population at large.