Part 68

Scrofula (tuberculosis) is, according to my own experience, the constitutional disorder which of all most frequently and most seriously affects ovulation; and it appears that the ovaries are subject to changes produced by this disease similar to those which occur in other glandular organs. In cases in which no cause of the existing sterility is ascertainable, the presence of scars due to scrofulous (tuberculous) changes in the lymphatic glands may serve as an indicator to show that the capacity for ovulation has been annihilated or seriously diminished in early life by scrofulous (tuberculosis) disease.

Among the causes of sterility, these three conditions: anæmia, chlorosis, and scrofula (tuberculosis), play a leading part; indeed, their importance in this connexion has hitherto been underestimated, more especially in regard to the comparative frequency with which they cause sterility. A large part of the favourable influence in the relief of sterility in women which is exercised by the “cures” at various watering places, depends upon the amelioration which is thus effected in the aforesaid constitutional disorders.

It has been assumed that diabetes, which renders men impotent, is competent also to cause sterility in women. Hofmeier reports a case which appears decisive on this point. In a woman 20 years of age, who had menstruated regularly since she was 14 until a year previously, when the flow had ceased, he found the uterus extremely small, barely 5 cm. (2 in.) in length, extremely atrophied, the ovaries also atrophied and very small; the urine contained large quantities of sugar. Here was doubtless a case of atrophy of the reproductive organs secondary to diabetes.

In England, where the excessive use of alcohol is observed very frequently in women as well as in men, sterility has frequently been regarded as a result of chronic alcoholism. Matthews Duncan reports cases which lead to the belief that alcohol has a specifically deleterious effect upon fertility. Apart from the general or constitutional disturbances dependent upon the abuse of alcohol, this agent has in many cases a well-recognized pathogenic influence upon the female reproductive organs, the morbid condition which is most frequently and most readily assignable to this cause being chronic oophoritis. The obesity which so frequently results from alcoholic excess is a contributory cause of sterility.

Certain drugs, more especially quinine and morphine, are reputed to cause sterility. Davies, reviving an old opinion, considers that of all drugs tannin is the most effective in leading to sterility, and he considers tea-drinking as responsible for this effect.

The influence of certain cerebral affections and psychical disorders in checking ovulation has been established. Thus, de Montyel has recently shown that in families subject to hereditary mental disorders, there is an unusually large proportion (1 : 7) of barren marriages.

In addition, there are many influences which are known to prevent or to diminish ovulation in the case of the lower animals, and which may therefore be assumed with considerable probability to have a similar effect in women. More especially we are here concerned with external influences affecting unfavourably nutrition and innervation, and therewith also ovulation; also near kinship between the parties to the act of intercourse; and finally hereditary predisposition. In animals, captivity, exposure to cold, over-exertion, insufficient or unsuitable food, and inbreeding, have been proved to result in infertility.

Doubleday asserted that “a too abundant supply of nutriment hinders reproduction, whereas on the other hand insufficient or improper food favours reproductive activity and increases the number of the offspring.” Spencer, however, rightly points out that the infertility noticed in these circumstances is not the direct result of prosperity, but depends upon the pathological obesity which is thus engendered by overfeeding.

No less interesting are the observations that have been made regarding sterility in animals in confinement. In such animals there are wide differences. Some refuse to cohabit, or have lost sexual desire; others, again, show excessive sexual desire and cohabit too often, without any result; or even if fertilization occurs, abortion often ensues. In yet other cases, though conception follows intercourse, and the animals go on to full term before delivery, the young are still-born, or are weakly and misshapen. Caged birds often lay no eggs at all or very few; or if they do lay, they neglect their eggs; or if incubated, the eggs fail to hatch out. In France, experiments regarding this matter were made with domestic fowls. If the hens were given great freedom, 20 per cent only of the eggs remained unhatched; with less freedom, 40 per cent of the eggs were failures; whilst if the fowls were kept in a coop, 60 per cent of the eggs were unhatched.

“Convincing proofs,” writes Darwin, “have been obtained to the effect that wild animals which have recently lost their freedom have their fertility diminished to a most remarkable extent. This infertility is not dependent upon any degeneration of the reproductive organs. There are many animals of the most diverse species, which, whilst they copulate freely in confinement, fail in these circumstances to conceive; others again, even if they conceive and have living young, give birth to these in numbers which are unquestionably much smaller than would be the case were the parents in the free state.”

Interesting observations have been made by pigeon breeders. They state that when pigeons brought up in the same nest pair, the number of their offspring is usually very small.

The influence upon fertility of unfavourable conditions of temperature, either excessive heat or excessive cold, is very great. In the case of pigeons, for instance, if the pigeon cot is adjacent to the heated wall of a dwelling house, the pigeons sometimes begin to lay as early as January, and may have young as often as eight times in a single year. When the dovecot is cold, on the other hand, the number of broods is smaller. In general, the procreative capacity is greater in summer than in winter.

As regards inbreeding, many facts are on record showing the influence of this practice in leading to the birth of malformed offspring and to sterility. Darwin writes, “if in a pure race, characterized by a certain tendency to sterility, we allowed only brothers and sisters to pair, in a few generations the stock would become extinct.” If animals closely related by blood pair, the number of their offspring is always less than the average.

In the case of the human species, however, the influence of the marriage of near kin in diminishing fertility cannot be regarded as definitely proved.

Occasionally the incapacity for ovulation and the sterility dependent thereupon are hereditary—paradoxical as this may appear. It is necessary to assume, that just as the sperm is at times unsuited for effective fertilization, so also the ova may be in a less or greater degree insusceptible of fertilization. In the present state of our knowledge, indeed, we are not in a position to be precise as to the exact nature of such incapacity. It is possible that the enveloping membrane of the ovum varies in its resistance to penetration, as Schenk claims to have proved in respect of certain of the lower mammals. In his experiments on artificial fertilization outside the body of the mother, he ascertained that the cells derived from the discus proligerus, surrounding the ovum in immediate contact with the zona pellucida, are in some instances easily separable one from another, so that the spermatozoa can readily obtain access to the zona pellucida; whereas in other instances, in which the ovum is of the same size and apparently in the same stage of maturation as before, these cells remain closely attached each to the other, and thus prevent the passage of the spermatozoa. This condition of the ovum, so unfavourable to fertilization, may be hereditary in certain families, and its transmission may render certain members of the stock infertile. Such instances as the following from my own practice are by no means rare. Of three sisters, whose family life was intimately known to me, one had one child only, a girl, whilst the two others remained childless. The girl of the second generation married and remained childless. In England it is well established that when, in cases of only-child-sterility, the offspring is of the female sex, this child will probably herself be barren. Galton found that in the case of 14 heiresses (i. e. the only children of wealthy parents), all of whom were married, 8 remained absolutely barren, whilst of the others, 2 had each an only child.

It was formerly believed that when a woman gave birth to twins of opposed sexes, the female infant would prove to be barren, this barrenness being associated with defective development of her reproductive apparatus. John Hunter (Animal Economy) ascertained that in the case of twin calves of opposed sex, the genital organs of the female twin were almost invariably imperfectly developed. But the supposition that this is true also of the human species has not been confirmed by experience. I know several married women who had twin brothers, and these women have borne normal children; however, the number of their offspring is remarkably small. Simpson, in Edinburgh, recorded the results of the marriage of 113 women who had been born with twin brothers; of these, 103 had proved fruitful, and 10 (i. e., about one eleventh of the whole) barren, although of these latter women, one had been married upwards of 5 years, and the remaining 9 for periods ranging from 10 to 40 years. Simpson also gave the history of four women who were all the fruit of triple births, some of which had consisted of two boys and one girl, others of two girls and one boy. All four of these women were parous. Again, a woman who had been one of a quadruple birth (three boys and one girl), herself gave birth to triplets. A collection of all the figures accessible to me relating to this subject, indicates that about ten per cent of the women born in such circumstances prove barren—a ratio which corresponds closely with the ratio of infertility in general.

Interference with Conjugation, Conditions Preventing Access of the Spermatozoa to the Ovum.

A condition essential to fertilization is a material union between the sexual products of the male and the female respectively—the act of conjugation. Thus, all conditions which prevent the spermatozoa from obtaining access to the ova, bring about sterility.

Spermatozoon and ovum being normal, a great variety of pathological conditions may prevent the one from gaining access to the other. It is necessary for fertilization that the mature ovum should leave the ovary, enter the Fallopian tube, and there come into contact with the male sperm. Interference with any one of these essentials may lead to sterility.

Thus, the constitution of the ovum itself may be at fault; or the entrance of the ovum into the Fallopian tube may not be normally effected; defects in these earliest stages of the process of fertilization are precisely the commonest and the most important. The emergence of the ovum from the graafian follicle may be rendered difficult or entirely prevented by pathological states of the ovary; again, by inflammatory processes in the ovary, the tubes, or the ligaments, by developmental defects in the tube, and by obstructions in its interior, the entrance of the ovum into the tube, and its free passage along the tube may be prevented. Numerous abnormalities and diseases of the uterus may on the one hand prevent the entrance of the ovum into the uterine cavity, and on the other may prevent the upward passage of the spermatozoa to their goal. Amongst conditions competent to produce these effects we must enumerate: displacements of the uterus, structural changes in this organ and its annexa, and other congenital defects and acquired states; more particularly must be mentioned, uterus infantilis, acquired atrophy of the uterus, flexions and versions of the uterus, new-growths and inflammatory states of that organ, abnormalities in the shape or size of the cervix uteri, and, finally, all conditions of the vagina or vulva which hinder the proper performance of the act of intercourse.

In diagnosing the cause of sterility, in determining whether in any particular instance it is due to some hindrance to the indispensable conjugation between the male and female reproductive elements, we have in the first place to ascertain the presence or absence of any of the numerous conditions which interfere with the proper passage of the ovum from the ovary through the Fallopian tube to the interior of the uterus. The simpler mechanical hindrances to conception, such as displacements of the uterus, or tumours of that organ or its annexa, are easily recognized; and the same is true of atresia of the cervix uteri, and of congenital or acquired stenosis of the vagina. When obliteration or stricture of the genital tract exists, a very careful examination, visual, digital, and instrumental, must be made, rectal examination not being forgotten. Not infrequently, amenorrhœa is attributed to ovarian disease, and only subsequently on local examination is the cause ascertained to be hymeneal atresia, with haematocolpos; many a woman has believed herself to be pregnant, until examination has disclosed the fact that the hymen is still intact, and that coitus has hitherto been effected through the urethra. The importance of these stenotic conditions as causes of sterility must not, however, be overestimated, for, although they are common among the hindrances to conception, the obstacle is by no means always insuperable.

Morbid changes in the secretions of the genital passages, whereby the vitality of the spermatozoa may be destroyed before they have time to reach the ovum and effect fertilization, are hard to diagnose, for the conditions upon which such changes depend have not as yet been adequately investigated.

Diseases of the Ovaries and the Fallopian Tubes.

Among the conditions which, although the maturation of the ovum proceeds normally to a conclusion, may prevent conjugation between the male and female elements, we must in the first place consider an abnormal condition of the tunica albuginea of the ovary, a thickening of this membrane in consequence of inflammatory processes or of new formation of connective tissue, whereby the dehiscence of the follicle is rendered difficult or entirely prevented. Such thickenings of the ovarian envelope are the residue of perioophoritic processes.

Such a hindrance to conception may be permanent or transient, and thus the sterility dependent thereupon may be relative or absolute. Similar is the effect of inflammatory processes affecting the peritoneal investment of the uterus, the broad ligaments, and the peritoneum clothing the floor of the pelvis; these conditions, perimetritis, perisalpingitis, and pelvic peritonitis, resulting in the formation of thick and extensive pseudomembranous bands, or in less severe cases leaving merely slight adhesions and filaments, which drag the uterus and the ovaries out of place, and thus render conception difficult or impossible.

Perimetritic adhesions are apt to lead to dislocation of the tubes either forwards or backwards, and most commonly into the pouch of Douglas, thus giving rise to sterility. Rokitansky and Virchow already insisted on the great importance of perimetritic processes in causing sterility.

That congenital defects of the Fallopian tubes may lead to sterility, is indeed a possible, but certainly a rare occurrence. The defect may be unilateral or bilateral; or it may be that merely a portion of one tube may be wanting. Bilateral absence of the Fallopian tubes is usually associated with defective development of the uterus, while the ovaries may be apparently normal. Such a case is described by Foerster and Kussmaul. The vagina opened into the urethra, the uterus was not calibrated, and diverged above into two solid horns, to which the round ligaments and the ovaries were attached. A congenital cause of sterility is to be found also in atresia of the tubes, the abdominal extremities of which are closed; this condition is met with also in other mammals. It is also assumed, with less accuracy, that a supernumerary ostium tubae may lead to sterility, in consequence of the ovum, which has found its way into the normal ostium, returning into the abdominal cavity through the supernumerary orifice. An unfavourable influence upon fertility is exercised also by a form of hyperplasia of the tubes which sometimes arises in consequence of erroneous development at the time of puberty; the tubes, increasing unduly in length, become serpentine in form instead of being nearly straight; this tends to lead to accumulation of the secretions, and renders the passage of the ovum difficult. (Freund.) Yet another defect of development which, as Klebs has pointed out, may lead to sterility, is absence of the fimbria which normally retains the abdominal orifice of the Fallopian tube in proximity with the ovary, in which case these structures may be separated by a wide interval.

The entry of the ovum into the tube may thus be rendered difficult by abnormalities of the abdominal orifice of the tube or of the fimbriae; but still more is this the case when the mucous membrane of the tube is diseased. The fringed border of the tubal orifice has a distinct tendency to independent disease. As Klebs’s anatomicopathological studies have shown, inflammatory changes are common in this region, leading to contraction. The free margin of the tube then appears to be strictured by overgrowth of fibrous tissue on the serous surface, the opening being thus narrowed or even entirely closed, whilst the fimbriae themselves may be drawn within the aperture. In other cases, the ring of fimbriae is adherent to some neighbouring part, especially to the ovary itself, when this also is diseased. Further, on the fringed margin of the tube we see papillary growths, telangiectases, or oedema with formation of cystic cavities.