“…Dementia slowly in¬ creases as the child develops massive myo¬ clonic jerks of the upper body.16,25 Deafness in association with myoclonic epilepsy is described by Latham The first attack of syncope occurs in early childhood, and is probably an AdamsStokes type of cardiac standstill. 48 The afflicted usually die in childhood, but post¬ mortem examination shows no gross abnor¬ malities of the heart. Electrocardiograms show marked prolongation of the Q-T inter¬ val, and large waves, but there is no clinical or x-ray evidence of organic heart disease.…”