Hypnotic Anesthesia.—When, in the first half of the nineteenth century, [{755}] scientific attention was seriously attracted to hypnotism, it was hoped that this would prove an effective means of producing anesthesia during surgical operations or at least of greatly lessening pain. The hope was not disappointed. There was a discussion on the subject before the Medical Chirurgical Society of London in 1840, and in 1843 Dr. Eliotson wrote a work with the title, "Numerous Cases of Surgical Operations Without Pain in the Mesmeric State." In 1846 Sir John Forbes wrote in his Review that "the testimony as to the value of hypnotism as an anesthetic is now of so varied and extensive a kind as to require an immediate and complete trial of the practice in surgical cases." At the end of that same year, ether as an anesthetic was introduced into England, and the first case was reported under the caption "Animal Magnetism Superseded," which shows how much attention the previous attempts at hypnotic anesthesia had attracted. After this, hypnotism was given up for anesthetic purposes except by a few enthusiastic students of it. These, however, succeeded in accomplishing much with it. Dr. Esdaile, in India, succeeded in doing all sorts of operations under hypnotism. Dr. Milne Bramwell, in "Hypnotism, Its History, Practice and Theory" (London, 1906), lays down the rules for hypnosis for anesthetic purposes. They are eminently practical.
While hypnotism can be used to produce anesthesia, it has many disadvantages. The length of the hypnosis cannot always be arranged so as to assure anesthesia during the whole of an operation, while in some cases it will continue after the operation for some time in spite of every effort on the part of the hypnotist to bring the patient to himself. Besides, the depth of the hypnosis cannot always be assured, and sometimes some sensation remains. Patients will groan and wince and move, though, of course, under ether or chloroform such manifestations may take place, yet the patient afterwards will give every assurance that not the slightest pain was felt. In some cases, however, even where the pain sensation is not severe during an operation under hypnosis, it may, nevertheless, prove sufficient, when continued for some time, to bring the patient out of the hypnotic state.
For short operations of minor character, undoubtedly hypnosis can be employed successfully. As we explain in the chapter on Hypnotism, anyone can produce hypnosis who has confidence in his own power and in whom the patient has trust. There is no need of a special hypnotist, and there is no special faculty required. There should be some familiarity with procedures, but any man has just as much hypnotic power as another. The influence does not pass from the operator to the subject, but is due to the subject's concentration of his attention so that there is a short circuiting of association tracts within the brain very probably, which does not permit the entrance into consciousness of sensations through any path except one or two, usually that of hearing, and sometimes of sight, less frequently of other sensations.
Concentration of Attention.—In a great many cases of minor operations, such as the opening of a boil of a small abscess, the pulling of a tooth, the lancing of a gum, or other such procedures, a surgeon who is confident in his own mental power over his patient can rather easily produce a state of mind in which the discomfort of the surgical procedure is greatly minimized. There are certain physical helps for this. For instance, if patients are asked to breathe rapidly and deeply for a few minutes, there is a hyperoxygenation [{756}] of the blood which seems to obtund sensibility. If patients are told of this, and then made to breathe rapidly for a half a minute in order that they may continue consciously their deep, rapid breathing even when pain is noted, a state of mind is produced from concentration of attention on their breathing in which painful sensations are greatly obtunded. The effect is probably more mental than physical, and is well worth while trying because of the amount of pain it often saves.
Waking Suggestion.—Without resort to hypnotism, much can be accomplished by mental suggestion in the waking state to lessen the pain of surgical operations and maneuvers. This is particularly true as regards nervous persons, who will otherwise emphasize their discomfort, and for those of lesser intelligence, children, and the like. Esdaile's experiences in India show how much can be done in this way. Often the hypnosis was so slight that the patients were perfectly cognizant of everything that went on around them, yet under the compelling influence of the assurance of Dr. Esdaile, whom they trusted completely, they did not complain of pain nor wince even when considerable surgical intervention was practiced, and they always assured their friends afterwards that they had felt nothing. I know an American physician who has an almost similar power over negroes. Ordinarily it requires more of an anesthetic to produce insensitiveness to pain in the negro than in a white person. By personal assurance, by the absolute securing of their confidence, and through their trust in him, this man is able to produce anesthesia without the use of more than a minimum quantity of the anesthetic. He is able to do the same thing with children, and, of course, it is well known that mental influence over them is extremely important in limiting the amount of anesthetic that will be necessary.
Personality of Anesthetist.—Some anesthetists by their personal influence are able to bring patients under the influence of an anesthetic with much less excitement and, as a consequence, with the use of much less of the anesthetic than others. It is the same question of personal influence that extends through all medicine. Some men seem to have it naturally, and others not, though to some extent, at least, it may be cultivated. Of course, it is now well understood that, under no circumstances, should a patient be forced to take an anesthetic. This is as true for a child as for any other patient. Only a little management is required to secure the cooperation of even a young child. Above all, there must be no struggling, and while there may be a passing stage of excitement, which cannot be entirely controlled, this can be eliminated by those who are skillful. It may be necessary, especially in the case of children, for the little patients to become familiar with the anesthetist. They should see him on several occasions and should be made to feel that they know him. The presence of a stranger is enough of itself to excite children and make them suspicious and resentful of any manipulations. It may be well for them to have breathed through the cone on several occasions and to play a sort of game with it. In this way children will often go under an anesthetic without any struggle or excitement.
It seems a little childish to suggest similar procedures with grown patients, but even surgeons of long experience with the older methods who have insisted on the trial being made on their patients have found much benefit from it. Familiarity with the anesthetist and even with the inhaler [{757}] and the breathing through it on several occasions beforehand, when no anesthetic is being administered, helps many patients not a little. This preliminary is particularly of help with regard to nervous patients and especially women. It is very seldom necessary to use nitrous oxide as a preliminary to ether if this mode of procedure is practiced.
Mental Diversion.—It is well to concentrate the mind of the patient on something else besides his sensations. One element that is extremely important for anesthesia is deep breathing. The patient must then have his attention called to the necessity for deep breathing and should frequently have the suggestion to this effect repeated in his ear as he comes under the anesthetic. There should be some practice in deep breathing deliberately beforehand, with the idea of accustoming the respiratory mechanism to take deep breaths by habit even when not entirely under the control of the will. This may be done with the inhaler on a few occasions at least. The occupation of attention necessary for deep breathing during the taking of the anesthetic lessens the concentration of mind on the feelings, and actually makes the discomfort much less. Besides, deep breathing distributes the anesthetic over the lungs, leads to its absorption more rapidly, and makes the irritation of the anesthetic less by diffusing it over a larger surface. On the contrary, short, rapid breaths lead to an intensity of irritation and much slower absorption.
Skilled anesthetists have found it of decided advantage to keep the patient's mind fixed on something else besides the breathing. Perhaps the easiest recommendation is that of locking the hands over the abdomen just above the umbilicus and asking the patient to hold tight. This gives something very definite to think about and to occupy the mind with. I have seen patients of rather nervous organizations go under the influence of even a very small quantity of an anesthetic when required to hold their hands thus and when the command was constantly repeated, "Hold your hands tight," whenever there was the slightest sign of struggle or excitement. Where this was done tactfully and regularly, I have seen patient after patient go into anaesthesia without struggle or excitement and usually without any noise or even a loud word. I realize how much the personality of the anaesthetist means in such cases, and I feel sure that anyone who is confident in his own power in the matter will produce a corresponding feeling of confidence in the patients.
Fright in Anesthesia.—There seems good reason to think that occasionally the deaths reported from anesthesia have really occurred from fright or at least have been greatly influenced by emotional factors. It has often been noted that these deaths occurred particularly at the beginning of the administration of an anesthetic and before anything like a sufficient quantity to produce a toxic effect had been administered. In other cases it has been noted that patients were allowed to come out partially from under the anesthetic, and as they recovered consciousness were disturbed by some incident. Sometimes the pain seems to act as an inhibitory agent on the heart. In more than one reported case the patient told afterwards of hearing very distinctly some remark that seemed to be of bad omen. In one case in my own experience the breathing and heart stopped (though the patient fortunately was resuscitated) as a consequence of hearing a series of rather loud goodbyes said at the door of the elevator leading to the operating room during the [{758}] course of an operation just at a moment when the anaesthetic influence was very much lessened for a while. In some cases where there has been great fear of the anesthetic which has been talked over beforehand by the patient, even a few whiffs of the ether or chloroform have given rise to serious symptoms from stoppage of the heart. It is evident that it is extremely important properly to predispose such patients.