Occasionally these curious manifestations of a catarrhal or asthmatic character in the presence of cats occur in people who like cats. Dr. Taylor in his "Types of Habit Neuro-Psychoses" published in the Proceedings of the Massachusetts Medical Society, 1896-98, tells the story of a young woman in whom he saw conjunctivitis developing while she was fondling a cat. In many cases [{376}] besides the hyperemia of the nose and of the respiratory mucous membrane generally there is marked injections of the ocular conjunctiva. It is rather difficult to understand the phenomena of asthmatic attacks in connection with cats and other animals in terms of a habit formed, because at some time asthmatic or hyperemic manifestations occurred in association with the handling of these animals and that then, somehow, suggestion works to reproduce the same symptoms in the presence of the animals later; but this is undoubtedly the only rational explanation that we have for many of these cases. It represents the most helpful explanation, so far as treatment is concerned, for by means of suggestion either in the waking state or in the first stage of hypnosis, in many cases relief can be brought to these patients. Repeated profound hypnotism is a vaunted remedy for these conditions in the hands of professional hypnotists, but serious physicians who have tried hypnotism do not recommend it. It helps for a time but relapse follows. Only continued suggestion and a carefully cultivated habit of self-discipline and control succeed.
Horse Asthma.—The cases of dyspnea in connection with horses are not less interesting. Occasionally, even when all aversion is absent, emanations from horses are capable of producing a curious effect on certain individuals. How much of this is psychic is not clear. I was once consulted with regard to a patient who suffered from asthma whenever she went to a dance. It mattered not how careful she was in not exposing herself to night air, or in wrapping herself up warmly; invariably a few hours after her return home, she was wakened from sound sleep by an attack of difficult breathing that required the opening of windows and the use of the accessory muscles of respiration in order to satisfy her air hunger, and even then her symptoms were quite alarming to herself and her friends. At first, her asthma was thought to be due to sudden changes of temperature in going out into the air after the dancing, and various devices were tried to lessen the shock of the cold to the respiratory mucous membrane. None of them had any effect. Then it was thought that the dust of the ball-room made the difference and so she was forbidden to dance. After a time it was found, however, that if she went out in the evenings to social functions, whether she danced or not, or though she avoided completely being in dusty rooms or where many people were moving, she still had the attacks a few hours after she returned home.
Finally it was noted that these attacks of asthma also occurred on several occasions after she had been out riding during the day in a carriage. Then one evening after a rather long intermission free from attacks, in spite of directions and her fears, she went to a ball, but owing to circumstances went and returned by trolley instead of, as usual, in the family carriage. That night she had no attack of asthma. Experiments were made then and it was found that whenever she rode behind horses she suffered from an attack of asthma during the following night. The attack was evidently not due to suggestion. The story illustrates the necessity for carefully analyzing all the circumstances of an asthma patient and making sure that some one of these curious and unusual conditions are not at work, for if they are, the only possible curative treatment is by influencing the patient's mind, first by demonstrating the cause of the affection and then by training in self-control to reduce the reaction.
Recently I have been consulted with regard to a physician who has developed in a rather curious manner a sensitiveness to the presence of horses. As an interne at a hospital during an epidemic of diphtheria he took a dose of diphtheria antitoxin for immunizing purposes. The amount injected was 750 units, the remainder of the dose of 1,500 units contained in the phial being given to the nurse who had charge of the cases. She suffered absolutely no ill effects, so that the manifestations in his case were entirely due to idiosyncrasy and not to anything in the serum itself. Within fifteen minutes after taking the injection the mucous membrane of his nose became so congested as to make it impossible for him to breathe through his nostrils and the mucous membrane of his soft palate was seriously disturbed in the same way. His face became much swollen, the edema affecting particularly his eyelids and his lips and hundreds of wheals appeared all over the body. Fortunately the edema did not affect the larynx, or the issue might have been fatal, or would surely have required intubation. His pulse became extremely rapid and weak, there was marked dyspnea, and whenever the patient sat up there was fainting or a distinct tendency to it.
Under active stimulation and elimination the symptoms rapidly passed off so that the only noticeable edema the next morning was in the eyelids and lips, which, however, also disappeared within twenty-four hours. Up to this time the physician had never been bothered by any tendency to hay fever or to asthma and there is no history of either of these affections in his family. Thereafter, however, though quite without his anticipating it, and, indeed, the first symptoms were incomprehensible, he became extremely sensitive to emanations from horses. When he rides behind a horse for some distance his conjunctivae become injected, the nostrils become congested and difficulty of breathing sets in with a sense of constriction of the chest. These subside as soon as he gets away from the presence of the horse and has washed himself thoroughly. He suggests that he has become sensitized to horse serum and, as it did not exist before his experience with diphtheria serum, he, of course, connects that incident with the present tendency. It is easy for such a case to have its real significance entirely missed and, of course, treatment by prophylaxis, the most efficient form, would then be out of the question.
Other Forms.—Apparently at times human emanations or some peculiarity of odor seems to influence asthmatic conditions. I have been told by a good observer—a physician—of two brothers who had an attack of asthma whenever they visited each other. At first this was attributed to something in the air or some other condition of the visit. After a time it was found to occur under varying circumstances, but that the one essential was the association with each other.
Treatment.—The more one knows about asthmatic conditions the more does it become clear that special study of individual cases is extremely important for any definite knowledge of the causation in a particular case. Without a knowledge of the cause the treatment is very unsatisfactory and in the meantime the unfavorable suggestion of the recurrence of the attacks acting upon the patient sometimes disturbs the general health. To remove this unfavorable influence must be the first care of the physician and then if the real cause can be found, favorable suggestion and modifications of the mode of life, with self-discipline and control of the mental attitude and of the [{378}] nervous system, may greatly aid in the reduction not only of the number of attacks and of the severity of the symptoms, but finally lead to complete eradication of the affection.
Mental control to some degree can be obtained and it has even been suggested that if the emanations from an animal cause physical symptoms, gradually increased dosage of them, beginning with very small amounts, that is, short periods of association with the animals in question, may gradually lead to the production of an immunity to them as it does even to the much more serious results of snake poison. Certainly some patients seem to have succeeded in bringing relief to themselves by this means and it is worth while remembering in the therapy of the affection, if for no other reason than the strong suggestion that goes with it.