(3) Traumatic influences are comparatively rare as a cause of natural spontaneous abortion; and it is true of these as of every other cause that it depends upon existing conditions whether abortion will result or not. The pounding of the belly is an ordinary method of producing abortion among primitive peoples: a fall, a jump from a wagon, may disturb the progress of gestation, while traumatism far more violent may not affect it, as in the case of the woman in the later months of pregnancy over whose abdomen the wheels of a physician's carriage passed without causing any injury whatever.
In the earlier months, while the ovum is still sheltered in the pelvic cavity, injuries are still less liable to cause abortion. I have myself seen a pregnant woman severely bruised about the lower bowels and go to term. I have been told by reliable physicians that local treatment of uterine disease has been continued by reason of the non-cessation of the menses to the third and fourth month, when pregnancy was discovered, and yet abortion did not follow, though I regret to say that quite a number of cases have come to my knowledge where the treatment of supposed uterine disease, especially of uterine tumor—pregnancy in fact—was suddenly terminated by the appearance of the corpus delicti, a four or five months' embryo. The intensity of the resistance is well illustrated in a case which it was my good fortune to see in consultation, where the most brutal local treatment had been resorted to for three or four months and abortion did not occur; the patient had left her persecutor and travelled hundreds of miles to seek treatment. The manipulations had been so violent as to produce metritis and cellulitis, yet the growth of the ovum continued, as demonstrated by the healthy foetus of five months which was at last expelled. I have but recently examined a lady who has been treated locally for uterine disease, and found her in the beginning of the third month of pregnancy, so far undisturbed.
We may well place the uterine sound and applicator among the traumatic causes. The physician himself, especially the gynecologist, has been sought out by women to aid in relieving them from the product of conception, and it is through sound or applicator that he is expected to accomplish the work. Among the many devices to which women—and, I am sorry to say, those in the most fortunate circumstances, in the best walks of life—resort to attain this end is one which certainly shows knowledge and shrewd calculation, but most villainous intent, which is not unfrequently practised, and against which it is well for the physician to be on his guard. It is that of forcing the attendant to uterine examination and treatment upon the plea of disease, well knowing that the germ must thus be destroyed. The woman calls upon a physician—in preference upon some specialist not attending in her family—upon the plea of uterine suffering, well knowing, either from personal experience or the gossip so common among ladies, some of the more common symptoms of this disease—backache, pains in the side, nervousness, weakness, menstrual suffering. She relates her case; upon questioning states that the period is just passed; and, though the examination may reveal nothing, though no application may be made, she well knows the uterine sound will be used. That is what she desires. If an application of iodine or nitrate of silver follows, all the better. Though for reasons far more important the physician should listen to the history of a patient with distrust, and rely must thoroughly upon his own examination, this course is especially indicated in gynecological cases without distinct sign of disease; and these very cases again point to the importance of a careful bimanual examination, and a resort to all other methods before the sound is used; and that in case of an enlargement of the uterus, discoloration of the cervix and vagina, we should under no circumstances introduce an instrument into the cavity unless it is established with absolute certainty that the congestion and increased size are due to pathological and not physiological causes.
Social Causes.—I wish to call attention more particularly to some of the abuses of modern life which not unfrequently interfere with gestation. These exist among all classes of society, high and low: among the poor they are unfortunately forced; among the wealthy they are the result of devotion to fashion and society. As we have seen that in the Old World abortion is common in the rural districts, it is an evidence of hard labor, especially in the field, at the wash-tub, and labor by which the abdomen is compressed, the abdominal muscles freely exercised. It is not only physical labor, but exposure to cold and wet, cold feet, which are to blame; in those more fortunately situated tight lacing, dancing, and consequent colds have a like injurious influence.
I would again allude to the newly-married, who are so subject to the lighter forms of traumatism, the always greater frequency of coition, the congestion and mechanical insult, the bridal trip being especially injurious. During this period of hyperæsthesia it is too great a strain upon the body as well as upon the nervous system: the young husband, unacquainted with woman's strength and needs, is always liable to judge her powers by his own. Railroad travel, the fatigues of sight-seeing, pleasures, theatre, and the dance, are all borne by the patient bride, anxious to please the groom: upon returning home the cares of the new house, excessive social duties, all combine to undermine the strength of a delicate woman in her first gestation. Enfeebled, often depressed by reason of gestation or nervous changes, excessive pleasures are forced upon her by reason of her condition—i.e. bride—and abortion follows; and, we may say, follows in consequence of traumatism. In other walks of life we find other conditions, still with the same unfortunate developments—excessive labor and pleasure during this period, when rest and care are so necessary. It is in young married women partly the pleasures of society, partly the unaccustomed duties imposed, which lead to injury. Ignorant of their condition, ignorant of the care necessary, even when aware of injury unwilling to acknowledge it, desiring to bear up, to show no weakness, they lay the foundation of much future suffering. The cause of so much uterine and pelvic disease in the unmarried, in the society girl, exists to the same extent in the newly-married, only that the injuries caused are far greater in the first period of married life, as the strain both of body and mind is increased in this most susceptible condition.
Local Causes.—Though the local causes on the part of the mother which lead to abortion, diseases of the uterus, especially of its mucous membrane, are equally frequent and equally amenable to treatment, they are of less practical interest to the general practitioner. Diseases of the uterus itself are not so important etiologically as those of its lining membrane: uterine tumors, unless of enormous size, usually admit of the completion of gestation; flexions and versions rarely interfere with the development of the ovum; a prolapsed uterus may bear the foetus to term unless the adhesions are unyielding and impregnation is impossible, because the uterus as it develops with the growth of the ovum rises beyond the confines of the pelvic cavity, and the displacement is thus remedied. Anteflexions and anteversions are always rectified; retroversions in rare cases only lead to abortion; adherent retroflexions are most to be dreaded; when the uterine body, bound down to the pelvic floor, expands within the cavity to such a size as to make escape through the brim impossible, abortion must necessarily follow. Deep lacerations of the cervix make conception improbable and interfere with gestation; cervical catarrh in no way affects its progress. Those morbid conditions of the uterine tissues which are unaccompanied by disease of its mucous membrane rarely lead to abortion.
Uterine contractions due to reflex nervous excitability are perhaps the most common of all these causes, yet here the uterus primarily is not at fault. A state of intense excitability is very often due to general causes, to intense febrile action, to congestion or anæmia; high or low temperature, whether due to external or internal causes, and irritation of the surrounding parts,—all of which conditions tend to increased contractility. Such diseases of the uterus as cause induration of the walls may lead to abortion, like the incarceration of the organ in the pelvic cavity, by reason of prevented distension.
Uterine Mucosa, Decidua.—Of far greater consequence than the conditions existing in the muscular tissue of the uterine wall upon the vitality and development of the ovum are those of the uterine mucosa in its state of physiological hypertrophy as the decidua of pregnancy. This soft, succulent tissue, rich in lymphatics and blood-vessels, is the nidus in which the ovum rests, its immediate protecting shelter, and the source from which nutrition is derived; hence morbid changes of this structure react promptly and forcibly upon the ovum—most so in the earliest stages, when it is altogether dependent upon this structure; less so as gestation progresses. As the ovum grows it becomes more resistant, its tissues more dense, and the source of nourishment is gradually changed to the large uterine sinuses at the placental site. Moreover, the decidua after the third and fourth month, when it has served its term, performed its function, gradually diminishes in thickness, until toward term retrograde metamorphosis is initiated preparatory to the expulsion of this structure, at that time merely forming a line of demarcation in the lax meshwork in its lower layer between the healthy tissue which remains and those structures which are passed off in labor. An inactivity of the mucous membrane, an imperfect development of the deciduous structure due to disease of the mucosa, is a frequent source of abortion. In chronic disease of the uterus or its lining membrane this rapid and healthy development of the decidua after conception is prevented, the delicate membranes of the ovum do not absorb the necessary nutrition, the development of the embryo is checked, morbid conditions of the ovum follow, and abortion results, especially at that time of active development, the period of placental formation. The decidua vera is the least important part of this structure, serving nutritive purposes only in the very first weeks at the site of placental formation, and sheltering the delicate ovum in the nest formed by its soft tissue: it is the decidua serotina, and especially that membrane which holds the ovum in place, the decidua reflexa, which claims attention. But morbid conditions of the vera, the greater part of the mucous membrane, are naturally accompanied by imperfect development of serotina and reflexa, and hence the imperfect imbedding and nutrition of the ovum.
Hypertrophy or excessive morbid development of the decidua may accompany acute infectious diseases, as we find similar conditions in other organs of the body, especially in the larger viscera. These changes, morbid in their character, interfere with development as do the atrophic forms. These hypertrophies may, however, exist independent in their nature, due to local disease of the uterus and its parts, as in chronic endometritis, where in place of the succulent deciduous structure we find an induration and a proliferation of the active tissue usually throughout the entire membrane, rarely localized, of a polypoid form: the chronic catarrhal affections are accompanied by an increase of secretion, morbid in character, which is liable to interfere with the development of the germ. Moreover, hemorrhage more readily occurs under these pathological conditions, usually secondary in character, brought about by minor insults, trivial causes, which would not affect healthy tissues. These hemorrhages, all-important in the early stages, affect development less and less as gestation advances, the importance of the decidua lessening and its functions being superseded. Where a slight extravasation of blood within the deciduous structure may lead to separation and expulsion of the ovum in the first and second months, larger hemorrhages are often without consequence when occurring within the same tissues in the fifth or sixth.
2. The Ovum.—Pathological changes of the ovum itself, of the embryo, of the surrounding membranes are less frequent as primary causes of abortion, and they are of less importance to the practitioner as being in no way amenable to treatment. When they do occur they usually lead to expulsion in the earlier months.