INTESTINAL ULCER.
BY JAMES T. WHITTAKER, M.D.
Intestinal ulcer, Ulcus intestinorum entero-helcosis ([Greek: helchôsis], ulcer), represents a solution of continuity in the wall of the intestine, affecting first, as a rule, its mucous coat. Ulcer of the intestine, like ulcer of the stomach, its occasional congener and not infrequent associate, is the expression of an insult or injury offered to the intestinal coat in its inner exposed surface, or of a necrobiosis the result of a local occlusion in the general blood-supply. Hence, ulcer of the intestine may be a purely local disease, or be the local expression of a general, so-called constitutional, disease. While in many cases the lines differentiating these conditions may not be distinctly drawn, as many so-called constitutional conditions (tuberculosis, typhoid fever, etc.) are discovered to be—at first, at least—local processes, the toxic ulcer (arsenic, mineral acids) may be taken as a type of the local process, acting from within, and the syphilitic ulcer as the type of the general process, acting from without. At the same time, it must be recognized of syphilis that an ulcer may result from the dissolution or breaking down of a gummatous mass anywhere in the course of the intestine, or may be the effect of infection by extension into the rectum of syphilitic processes about the genital organs, or, lastly, of direct introduction of the disease in perverted intercourse (pederasty, coitus heterotopicus).
Ulcer of the intestine is occasionally, though comparatively very rarely, observed also as the result of pressure from within or without. Such an ulcer is properly considered of traumatic or mechanical origin, as it is induced as the direct effect of mechanical irritation or arrest of blood-supply. Thus, dense masses of inspissated feces, foreign bodies, indigestible residue of food, may fret the mucous surface into a condition of hyperæmia, and, later, absolute ulceration. Undue retention, as behind a cicatricial contraction, or an occlusion from whatever cause at places where the intestinal tube normally offers resistance (at the ileo-cæcal valve, sigmoid flexure, etc.), may lead to ulceration in the same way. Schönlein has called attention to the paralytic condition of the intestinal muscularis in age as a predisposing cause of mechanical intestinal ulcer; and Virchow has noticed the same condition among the insane, whose intense preoccupation leads to neglect of evacuation of the bowels. Certain intestinal parasites, more especially ascarides, are admitted as occasional causes of ulceration, and more superficial solutions of continuity in the rectum have been noticed as the result of too frequent or too careless use of enemata.
Curling was the first to call attention to the fact that extensive burns of the skin are sometimes followed by ulceration of the intestines. The ulcerative process is almost exclusively confined to the duodenum. Various attempts have been made to explain the intestinal ulcer consequent upon burning of the skin, but a satisfactory explanation is lacking as yet. Leube suggests an inhibition in the force of the circulation by reason of accumulation of waste products in the blood, while Billroth believes the ulcer to be the result of an embolic process. Whatever the cause, the frequency of its occurrence makes it more than a mere coincidence. According to Meyer, it is observed most frequently in women, and shows its first symptoms in seven to fourteen days after the initial burn.
Aside from toxic and traumatic causes, ulcer of the intestine occurs as the result of dysentery, typhoid fever, and tuberculosis—diseases mentioned in the order of frequency in the production of intestinal ulcer. The ulcers of dysentery in the large intestine, and of typhoid fever in the small intestine, assume such prominence in these affections—having even been erroneously considered at one time as the cause of these maladies—that their study belongs to the history of these diseases. The ulcer of tuberculosis is rather an accident in the course of this affection, and is now recognized as the occasional result of direct infection by the ingestion of tuberculous flesh, or, far more frequently, of the deglutition of tuberculous sputum. As a rule, the tuberculous ulcer shows itself late in the course of pulmonary phthisis, and is the cause of the obstinate and colliquative diarrhoea which speedily exhausts the patient. Yet cases are occasionally met in which numerous or extensive ulcers occur in the intestinal canal early in the history of phthisis, before any serious damage has been inflicted upon the lungs. The tuberculous ulcer affects, and for the most part is confined to, the same structures which form the seat of disease in typhoid fever—viz. the solitary and agminated glands of the ileum. When the bacilli tuberculosis are conveyed to the intestine by means of the lymph- and blood-supply through the mesenteric vessels, the resulting ulcer takes the shape of the vascular arrangement; that is, the long axis of the ulcer is at right angles to the course of the tube. Thus, if sufficiently extensive, the ulcer may be circular or form a girdle or ring entirely around the tube. With the tubercular ulcer or ulcers are usually found tubercular nodules or plaques in the serous coat, which are visible to the naked eye as opacities or milky deposits beneath the peritoneal coat. The glands of the mesentery may be at the same time so much increased in size as to form visible or palpable tumors in the abdomen.
The frequency with which tuberculosis affects the vermiform appendix has already been noticed in detail in the etiology of perityphlitis.
The ulcer of the intestine which is the result of a catarrhal process, so called, belongs to the history of chronic diarrhoea and dysentery.
The true intestinal ulcer, per se, which has its analogue in the stomach as the gastric ulcer, ulcus rotundum, is due to the same cause as in the stomach—viz. to arrest of circulation and erosion by the gastric juice. It is a well-established fact in physiology that gastric digestion is continued—is, indeed, mainly effected—in the small intestine; hence it is not surprising to learn that an arrest of circulation in the small intestine is attended by the same result. The fact that this so-called peptic ulcer is found almost exclusively in the duodenum speaks most emphatically for this origin of the disease. Arrest of the circulation in the intestinal wall may be due to embolus, which, according to the observations of Nothnägel and Parènski, is not infrequently found in the branches of the duodenal artery; to infarction, the condition so commonly encountered in pyæmia and septicæmia; or to thrombotic occlusion, as seen in amyloid degeneration—a disease process which selects by preference the vessels of the alimentary canal, along with those of the kidney and spleen.