Kitabı oku: «A Statistical Inquiry Into the Nature and Treatment of Epilepsy»

These three papers have already appeared in the Medical Journals, at different dates, during the past few years. They are now republished together, so as to form a connected inquiry. Since the production of the first and second of them, increased experience has greatly augmented the clinical material which might have been utilised in their investigation: but, as the essential facts have only thus been confirmed, and the general conclusions arrived at have remained the same, it has been thought best, with the exception of certain verbal alterations, to preserve the text of the articles as they originally appeared.

A. H. B.

38, Queen Anne Street, W.

May, 1884

I.
AN ENQUIRY INTO THE ETIOLOGY AND SYMPTOMATOLOGY OF EPILEPSY.¹

The science of medicine is to be advanced by the careful collection of well-recorded facts, rather than by general statements or unsupported assertions. No inquiry thus conducted with scientific precision can fail to be without value, and to add a mite to that store of positive knowledge from which must emanate all hopes of progress for the healing art. Our acquaintance with the nature of epilepsy is as yet in its infancy, and although much valuable practical information has been put on record regarding this disease, it is believed that the following contribution may not be useless in either confirming or questioning previous conclusions.

The clinical aspects of epilepsy are especially difficult to investigate with exactitude. The physician, as a rule, is not himself a witness to the chief phenomena characteristic of the disease. He is therefore compelled, in most cases, to trust to the statements of the patient and his friends for their description, and even when the cross-examination is conducted with the greatest care, there are many points impossible to ascertain with certainty. In the following cases of epilepsy, which have been under my own care, those only are included in which loss of consciousness formed the chief feature of the attack; and in the succeeding particulars, attention will be specially directed to etiology and symptomatology.

ETIOLOGY

This may conveniently be discussed under (1) Predisposing causes, and (2) Exciting causes.

1. – Predisposing Causes

Sex and Sexual Conditions.– In one hundred unselected cases of epilepsy there were —

showing that practically the sexes were affected in equal proportions. Of the females there were —

The greater number amongst the unmarried females is probably due to the list including children, and also to the fact that epilepsy is not an attraction to a man who purposes matrimony. Of the married females —

Thus, in the majority of cases, marriage seems to have no influence on the epileptic attacks of women, although in 27.2 per cent. the fits appear to have been diminished after that ceremony.

Of the married females there were —

Age.– In one hundred cases the age at which the first attack of epilepsy took place will be seen from the following tables: —

It will thus be seen that, in males, the most prevalent period for the first invasion of epilepsy is from the tenth to the thirtieth year; in females, from the first to the twentieth year. In both sexes the disease rarely commences after forty. The following table shows the ages of the patients under observation: —

This indicates that cases of epilepsy comparatively rarely come under observation after the age of forty. A large series of cases would however be required to determine any definite conclusions as to the mortality and longevity of the patients.

Occupation and Profession.– These do not appear to have any special relation to the production of epilepsy.

Hereditary Tendency.– In each of the cases under observation a very careful inquiry was made into the family history. This was confined to the parents, grand parents, uncles, aunts, brothers, sisters, and children of the patient. The following are the results: —

No family history of epilepsy, insanity, nervous or other hereditary disorders in 59 per cent.

One or more members of family affected with one or more of the above disorders in 41 per cent.

Of these last, in which there was a tainted hereditary history, one or more members of the family suffered from —

Concerning the above table, it is to be remarked that frequently the patient had several relatives suffering from different diseases; for example, one with epilepsy, a second with insanity, and so on. In such a case these have been classified under epilepsy, and, if this did not exist, under insanity, or other afflictions in the above order.

Of those cases in which epilepsy was present in the family of the patient, it existed in the following members: —

From these figures it will be seen that in no less than 41 per cent. of the total number of cases there was a distinct family history of hereditary disease. Of these no less than 87.5 per cent. were affections of the nervous system, and 12.1 per cent. of phthisis. Of the former 63.4 per cent. had relatives afflicted with epilepsy, and 12.1 per cent. with insanity. Epilepsy, according to these figures is eminently a hereditary disease, and it is possible even to a greater extent than is here represented; for the family history is often very difficult to arrive at, in the class of persons on whom most of these observations were made, who, either from ignorance or from prejudice, display a great want of knowledge concerning the health of their ancestors.

General health prior to the first attack.– As far as could be ascertained this was —

By the term delicate is understood any chronic derangement of health. The figures serve to indicate that, in the large majority of cases epilepsy has no necessary connection with the impaired general health of the patient.

Special illnesses prior to the first attack.– There were —

Of these persons who, prior to the first attack of epilepsy, had suffered from illnesses, the details are as follows: —

The only special feature of this table is the fact that, of the cases of epilepsy under observation, convulsions at dentition were positively ascertained in 15 per cent. of the total number of cases, and in 43.7 per cent. of those having suffered from former illnesses. Here also the percentage is probably in reality greater, as it is obvious that many of the patients were ignorant as to whether or not these symptoms existed. There is no evidence that any of the other illnesses had any relation to the epilepsy.

Temperance and Intemperance.– On this head nothing definite could be ascertained. The patients either do not tell the truth, or have very elastic notions as to moderation in the use of alcoholic stimuli.

2. – Exciting Causes

To ascertain the exciting causes of epileptic seizures with exactitude is usually a matter of very great difficulty. It is simple enough when the results directly follow the cause; but this is not commonly the case. If, for example, a man, after a blow on the head (having been previously in good health) becomes suddenly seized with epileptic attacks within a few hours or days of the accident, we may fairly assume that the injury has originated or developed his illness. But should the seizure not supervene for some months or years afterwards, the external wound having in the meantime completely recovered, there remains on this question a considerable element of doubt. In the same way a patient often attributes the attacks to a fright which may have occurred weeks or months before they began; yet great care should be taken in accepting such a statement: on the other hand, it should not be utterly ignored. Again, if a person develops epilepsy after severe and prolonged domestic trouble or affliction, how are we accurately to determine the relation between the two? These difficulties render an exact method of ascertaining the exciting causes almost impossible, and this can only be approximated by a careful consideration of the entire history and circumstances of the case. Taking these into consideration, the following statements have been drawn up, in which only those conditions are recorded, where from a review of the whole case a reasonable relation was found to exist between cause and effect.

In a hundred unselected cases of epilepsy there were —

Of the cases where a possible exciting cause was present, the following is an analysis: —

Thus, in no fewer than 16 per cent. of the total number of cases, and 28.1 of those in which a possible exciting cause was present, did epileptic seizures follow injuries to the head. Of the cases recorded under uterine disorders, it must be stated that these conditions were as much the accompaniments as the cause of epilepsy, the relations between the two being as follows: —

An attempt was made in twenty-two cases to ascertain whether, in women, the age at which the epileptic attacks began had any relation to the period at which the catamenia commenced, with the following results: —

This shows singularly enough exactly the same figures, and serves to point out, that in women, the earliest manifestation of puberty is a decided exciting cause for epileptic attacks. It must however be stated that, in the female epileptics, the attacks commenced before the age of puberty in 16.9 per cent. of their numbers. Of the 8.7 per cent. of cases included under the term "diseases of the nervous system," the epilepsy was associated with hemiplegia in all.

SYMPTOMATOLOGY

In a hundred unselected cases of epilepsy there were —

1. – Epilepsia Gravior

Premonitory Symptoms.– In the cases in which epilepsia gravior was present there were —

Of those cases in which there were symptoms premonitory to the attack, there were —

By general premonitory symptoms are understood those morbid conditions lasting for some hours or days before each attack, and of the cases under consideration in which these were present, the following is an analysis: —

Of the cases in which a special aura preceded the attack, the details are as follows (the special symptom in each case being sudden): —

From these figures we find that in 34.4 per cent. of the cases of epilepsia gravior there are no special symptoms announcing the seizure, which takes place without warning of any kind; and it is especially in such cases that patients in falling, seriously injure themselves. In 65.5 per cent. there are premonitory symptoms of some kind, which indicate often many hours before the approach of an attack. Of these last 47.4 per cent. are of a general character, and in no less than 72.8 per cent. is there a distinct special aura, which in 25.4 per cent. alone precede the attack, the remainder being associated with the general premonitory symptoms.

Symptoms of the Attack.– In the cases of epilepsia gravior there were complete loss of consciousness with convulsions, lasting from five to ten minutes, and occurring at intervals, leaving no question as to the true nature of the disease, and all doubtful examples have been excluded from this collection. Attempts were made to form an analysis of the different symptoms constituting the paroxysm, but with indifferent success, and these are not here reproduced, because they are not sufficiently accurate for scientific purposes. The patient himself can give no account of what takes place. The friends around do not look upon the phenomena of the attack with the critical and philosophic eye of the physician; hence any information from them as to the part convulsed, the colour of the skin, the duration of the seizure, and so on, is extremely vague and untrustworthy. The number of cases personally observed actually during attacks is too limited to warrant any generalizations. There is, however, one important point which can be accurately demonstrated – namely, whether or not the tongue is bitten, and in the cases under observation

Frequency of Attacks.– Only a general average of the number of attacks can be made; and in the present series the following gives an idea of the frequency of seizures in different individuals.

This roughly indicates that, in the majority of cases, attacks of epilepsia gravior occur one or more times weekly or monthly. Under the last series, of attacks taking place at longer and more irregular intervals than a year, are included those cases where a few only have occurred during the lifetime of the patients.