In general, it is well understood that the more serious the epilepsy the more liability there is of the development of permanent mental disturbance. The earlier in life the epilepsy declares itself, too, the more unfavourable is the prognosis as to the enduring retention of complete mental sanity. In people in whom the epilepsy commences late in life, the process of mental deterioration does not begin to be noticeable so soon as when it occurs in younger years, and besides, it practically never runs a rapid course. Epilepsy, however, developing late in life, unless for some special cause, as injury or the development of syphilitic tumours in the brain, is an extremely rare affection. Idiopathic epilepsy, that is, epilepsy for which no definite cause can be discovered, is usually dependent on hereditary instability of the nervous system and is typically a disease of early years, of childhood { 258} and adolescence. According to the best authorities, about one-fourth of the cases of epilepsy make their appearance before the age of 7 years. Over 50 per centum of all cases develop before puberty. About one-third of all the cases develop between 14 and 20. And even of the remaining, less than 20 per centum, over 12 per centum develop between 20 and 25, leaving scarcely more than 5 per centum for all the remaining years of life.
Of course, even in severer forms of epilepsy, mental disturbances do not appear at once. It sometimes takes many years for the constantly recurring manifestation of explosive nerve force to produce the deterioration that gives rise to lowered rationality. Distinct mental deterioration is eventually inevitable, though modern experience with epileptic colonies, in which patients are enabled to live a quiet life, most of it in the open air and under conditions of nutrition and restfulness especially favourable for their physical well-being, shows that the development of insanity may be put off almost indefinitely.
There are many advertised cures for epilepsy. None of them is successful, and all of them may do harm. The bromides have a distinct effect in lessening the number and frequency of seizures, but if taken to excess they have a serious depressing effect upon the patient. There have been more cases of mental disturbance among epileptics, and intellectual degeneration sets in earlier, since the introduction of the bromides, than before. It is the abuse of the drug, however, not its use, that does harm. More important than any drug is the care of the patient's general health. The digestion must be kept without derangement; the bowels made regular; all sources of worry and emotional strain must be removed. Patients should as far as possible live in the country, and farm life has been found especially suitable. Relatives are often a source of irritation rather than consolation to these patients, and the life in epileptic colonies has been found eminently helpful.