Elements of Surgery

by Robert Liston

Hernia has been classed with tumours. It is a swelling, but of a peculiar kind, and attended in some states by peculiar symptoms. The term rupture is in common use instead of hernia, but was at first applied from a false notion of the disease. There is a descent of viscera, but not often rupture of the parietes. By hernia is meant protrusion or escape of the contents of any cavity, but the term is most frequently applied in regard to the abdomen. The protrusion may occur at various parts of the abdomen; through the diaphragm, constituting Phrenic Hernia; through the umbilicus, constituting Exomphalos; through the dilated apertures for transmission of vessels, constituting Ventral Hernia; through the inguinal canal, constituting Inguinal Hernia; through the crural aperture, constituting Crural or Femoral Hernia. The most frequent forms are the inguinal and crural,—the effects of pressure or action of the muscles on the abdominal contents being concentrated towards the lower part of the cavity. It is but rarely that the bowels protrude through the sacro-ischiatic notch, or through the obturator foramen, or by the side of the vagina, or betwixt the bladder and rectum.

It is of great importance for the student to study attentively and reflect on both the healthy and morbid anatomy of this disease. When a hernia is strangulated, there is an absolute necessity for early interference; the bowels are obstructed, and their action inverted; feculent vomiting ensues, and enteritis is threatened, with all its dangerous consequences. He may meet with the affection at a very early period of his practice, and may be so situated as to command no assistance or advice; he must be guided by his own judgment and knowledge. He should be well aware of the relations of the parts to each other, and the changes likely to have been occasioned by the disease. If, through delay, the patient lose his life, or if an operation be attempted, and its object improperly accomplished, or not accomplished at all, his reputation may be blasted. But if he interferes skilfully, and at the proper time, and save his patient, relieving him at once from all his painful and dreadful symptoms, great credit and professional fame may be in consequence acquired. An examination of the healthy anatomy is not sufficient; many changes take place, which mere anatomical and physiological knowledge could never anticipate. Extraordinary displacements and adhesions occur. The parts are altogether changed; and repeated examination of the morbid state alone can impart the requisite knowledge to one previously well acquainted with the healthy structure.

In consequence of laceration or separation of fibres, hernia may occur suddenly, and even in the best formed parts, from very violent exertion—as in leaping, wrestling, pulling, lifting heavy weights; from sudden exertion of the abdominal muscles in any way; from blows, &c. Or the protrusion may come on gradually, after slight exertions, where the tendons are naturally weak or deficient; or it may be slowly induced by repeated and almost constant muscular action, as in urinary, intestinal, and pulmonary complaints: in such cases, slight pain is usually felt at the site of the protrusion before the tumour is perceived. The disease is often congenital. But the common cause of abdominal hernia is powerful action of the abdominal muscles, compressing the viscera to a greater or less degree, and with more or less suddenness; the viscera resisting the compressing force, react on the parietes, and these, yielding at the points which are naturally weak or deficient, permit enlargement of the coerced cavity by protrusion of part of the contents. When the compression and reaction are sudden and violent, the protrusion is the same; but when the former are not sufficient to overcome the cohesion of the parietes by a single occurrence, by repetition the morbid end is gradually effected, the hernia is proportionally slow in making its appearance, and gradual in its increase.

To understand the nature of congenital scrotal hernia, the student must recollect that the testicle in the fœtus is lodged in the cavity of the abdomen immediately below the kidneys, and resting on the psoas muscle; that it gradually descends into a process of peritoneum, called spermatic, which extends from the general peritoneal cavity down towards the scrotum, and which ultimately constitutes the tunica vaginalis. The orifice of this peritoneal pouch not closing immediately after the descent, may permit a fold of intestine to slip into its cavity, and remain in contact with the testicle. Or the testicle may, though rarely, contract in the abdomen an adhesion to a portion of bowel, and in its descent bring this along with it. In either case the bowel remain in its new situation, and constitutes congenital hernia.

Hernia infantilis differs from the hernia congenita, and is a kind of protrusion peculiar to the early period of infancy. In the congenital form the protruded intestine is in immediate contact with the testicle, and surrounded by the tunica vaginalis testis; but in hernia infantilis a process of peritoneum is interposed betwixt the intestine and the vaginal coat. The affection occurs after the abdominal aperture of the spermatic process has closed, but before the rest of that process has become incorporated with the spermatic vessels and their surrounding cellular tissue. In fact, only the peritoneum proper has closed, and forms the septum between the cavities of the abdomen and of the tunica vaginalis; but being insufficient to withstand the impulse of the abdominal contents, yields before it, and descending along with the protruding portion of bowel, forms its envelope, or the proper hernial sac, within the cavity of the tunica vaginalis.

Such is the opinion generally adopted in regard to the nature of hernia infantilis; but its accuracy is doubtful. It seems more probable that the bowel, covered by a fold of peritoneum, is protruded into the cellular tissue of the spermatic chord, after closure and contraction of the spermatic process, and descending till it reach the upper and posterior part of the tunica vaginalis, adheres to this tunic, bulges it forwards, and is covered by it. On cutting down in such a case, the hernial tumour may appear to be lodged within the tunica vaginalis; whereas the bowel is actually placed exterior to the tunic and behind it. Indeed, the case is similar to the common scrotal hernia, only the tumour is behind, not anterior to the vaginal coat. And this relation of parts is more apt to occur in the infant than in the adult; for in the former the testicle does not for some time descend fully into the scrotum, and whilst it is lodged in the groin a fold of peritoneum protruded into the spermatic chord may soon contract adhesion with the tunica vaginalis, afterwards descending along with it and the testicle. The subjoined case, illustrative of the preceding statement, came under my observation in 1814.—J. S., æt. 21, was admitted into the Royal Infirmary, with symptoms of strangulation which had been of eight days’ duration. The hernia had existed from infancy; it was on the right side, and tolerably large. In the operation, on dividing the integuments and various coverings, a sac was opened, which proved to be the tunica vaginalis, containing the testicle, a considerable quantity of serum, and a large, smooth, transparent tumour above the testicle and behind the posterior layer of the tunica vaginalis. The operator was puzzled, but finally determined on cutting into this tumour; it proved to be the hernial sac, covered by the tunica vaginalis, containing three or four ounces of serum and a portion of omentum. The protrusion could not be returned; after relieving the stricture, the omentum was cut away, and the bleeding vessels tied separately. The patient died on the third day after. An analogous case is on record; and a third has been related to me by an old and experienced surgeon: in that instance, both the anterior and posterior layer of the tunica vaginalis, together with the true sac, were simultaneously divided; omentum and intestine protruded into the vaginal coat, and for a time the opening through the posterior part of that cavity and sac was mistaken for the inguinal ring. On extension of the incision, the nature of the case became more apparent, the stricture was relieved, and the protrusion reduced. A case, in many respects similar to those above described, occurred a few years ago in my practice at the North London Hospital. It is recorded in the Lancet and in the Practical Surgery.

Children are sometimes born with deficiency of the umbilicus, and protrusion of bowel into the loose cellular tissue of the umbilical chord; the disease is termed congenital exomphalos.

Almost all the viscera of the abdomen and pelvis are liable to protrusion—the stomach—the spleen—the omentum—the great and small intestines, and even some of their most fixed parts—the ovaria—the bladder. Also, right portions of the viscera occasionally escape on the left side of the parietes, and the left at the right.

Hernial protrusion has received different names, according to the nature of its contents. When composed of a portion of intestine, it is termed Enterocele; Epiplocele, when composed of omentum; and Entero-epiplocele, when both intestine and omentum have escaped; and, as already observed, different names are also applied, according to the situation of the protrusion.

The inguinal and crural forms of hernia being the most common, will chiefly occupy our attention. The inguinal is divided into true or oblique inguinal, and into direct or ventro-inguinal. In the oblique, the protrusion passes along the inguinal canal. This course is in young persons short; but as the muscles become developed it is lengthened to about two inches, reckoning from the external ring to the funnel-like opening through the transverse fascia. The appearance of the swelling in this canal leads to diagnosis betwixt the oblique and direct hernia; but in chronic cases, this distinction is often in a great measure done away with. In large and old oblique ruptures the neck of the tumour is shortened, and the openings of the canal are approximated and more in a direct line. They are also immensely dilated, being often enlarged to such an extent as to admit all the fingers of the hand, when placed in a conical form,—and this even in the living body, the loose integument receding along with the tumour. The epigastric artery is situated behind the neck of the sac, on its inner side; and it is much displaced inwards in cases of old standing. The direct hernia passes through the parietes opposite to the external ring, and does not come in contact with the spermatic chord until it has reached that point. Its neck is short, and the epigastric artery is on its outer side. The coverings of the two tumours are different. Those of the oblique are such as the chord possesses—a prolongation of the transverse fascia, a covering from the cremaster muscle, fibres from the edge of the external ring, and the superficial fascia of the abdomen. The direct has only the last. A very old woman was operated upon in the North London Hospital a few days ago, for strangulated hernia of several days standing. The tumour was high in the inguinal region: on cutting down upon it, the tendon of the external oblique was found to cover it completely. The external ring was occupied by a mass of fatty matter, which probably had been displaced. The tendon was divided, and the sac, of considerable size, exposed. The opening through which the protrusion had taken place was very small, and situated a good deal to the mesial line of the internal aperture of the canal. The hernia was at the time of operation supposed to be ventro-inguinal. The patient was relieved for a time, but eventually sunk exhausted. An opportunity was thus unfortunately afforded of verifying the opinion formed. The hernia had two proper coverings, the superficial abdominal fascia and the tendon of the external oblique. The opening was inside the epigastric. The portion of bowel which had been extruded and returned was very tender, but it had adhered to the peritoneum, close to the place where it had been confined.