Thus far we have spoken of the common forms of acute and subacute cystitis; it only remains to say a word with regard to its rarer manifestations. The inflammation may extend to the submucous coats, becoming interstitial cystitis. Again, this may limit itself here, or it may extend still deeper to the serous coat, in which case it is known as peri- or epi-cystitis. Peri-cystitis is almost always a secondary disease, arising sometimes from deep ulcerations of the inner coats of the bladder, such as occur in chronic cystitis. More frequently it is but a part of a pelvic peritonitis which originated outside of the bladder itself. The final result of peri-cystitis is to form adhesions between the bladder and the neighboring organs, and thereby prevent distension of the bladder.
A very rare form of gangrenous inflammation has been described, but it is more than doubtful if this ever occurs in women except as the result of mechanical violence or pressure, already described. The specific lesion of croupous or diphtheritic inflammation has occasionally been diagnosticated, either from shreds of false membrane passed by the urethra or by means of the endoscope. Gonorrhoeal inflammation of the bladder has been less carefully observed in women than in men. Still, it is known that this specific inflammation extends to the bladder in some cases, but it does not differ essentially in its pathology, history, or treatment from that arising from other causes; hence it is unnecessary to dwell upon it here.
The pathology of chronic cystitis is characterized by ulceration and sloughing of the tissues involved. They do not differ materially from the same processes elsewhere, except that the salts of the urine are apt to be deposited upon the shreds of dead tissue the products of destructive inflammation. The hard masses thus formed are passed with great pain. They block up the urethra, and are only expelled by extra strong efforts which cause intense suffering.
Lastly, the ulceration may extend through the bladder into the peritoneal cavity and give rise to septic peritonitis and death, or the perforation may take place into the cellular tissue of the roof of the pelvis, and cause a fatal cellulitis.
SYMPTOMS.—The various forms of cystitis being but different stages and degrees of the same disease, their symptoms may be discussed all together. For convenience we shall consider them under three heads: (1) Referable to the organs themselves; (2) Symptoms referable to the neighboring organs; (3) General symptoms.
(1) In all forms of cystitis there is more or less derangement of function, as shown by pain, tenesmus, and frequent micturition. In the mildest form of the trouble there is a frequent desire to pass water, which often comes with unusual force. Micturition is followed by a desire to strain, as if the organ was not fully emptied. This sensation may pass off in a few moments, and not arise again till the next micturition, but in the severer cases it may last continuously. When urethritis is also present there is the additional and characteristic symptom of painful scalding as the urine passes over the inflamed track.
In urethritis alone there is often a desire to urinate frequently, but if the desire is resisted it passes off, and the patient can retain the urine for a long time. This symptom should not be mistaken for the tenesmus of cystitis. In the more advanced stages of the disease, especially as ulcerative changes occur, the tenesmus becomes more violent. The pains also are more diffused, often shooting to the umbilical region. There is often a dull, aching pain in the perineum, and in nearly all cases there is continuous backache, or, more correctly, sacral pain.
The composition of the urine is of great importance. The specific gravity in cystitis does not present any constant change, except that in the chronic forms it is often a little below the normal. The reaction in acute cystitis, at first, at least, is usually acid, whereas in the chronic forms it is almost invariably alkaline. The color at first is not particularly altered; later, unless discolored by blood, it is a pale, dirty yellow. The odor is normal in the acute type, unless where retention has been followed by decomposition, but in the chronic form it is not only ammoniacal, but has a characteristic fleshy or organic smell. The sediment in the acute varieties is mainly light and yellowish, composed of mucus, with some pus generally; in addition there may be blood, epithelium, and the amorphous and triple phosphates. In the chronic forms the sediment is usually heavier and of a darker brownish color. Flakes of pus, shreds of tissue, blood, and epithelium in all stages of growth are more or less present, and in the intensely alkaline conditions of the urine the pus and mucus form a jelly-like, ropy, opaque mass.
Albumen will be found if there is pus in the urine without there being any kidney disease. As the result of a careful analysis of a number of cases of chronic cystitis, the amount of albumen varied from one-sixteenth to one-fifth of the volume of urine. Microscopically, in addition to the pus, mucus, organic shreds, phosphatic and other crystals already spoken of, the most interesting appearances are the various kinds of epithelium. In the advanced stages of chronic cystitis epithelial elements of any kind are very rarely found. It is only in the earlier stages that normal and transitional forms of vesical epithelium are present, and again they reappear on the subsidence of the inflammation. This fact is of great importance, because the transitional forms of bladder-epithelium are often indistinguishable from the permanent forms of the urinary tract higher up. It is thus often impossible to make a differential diagnosis between pyelitis and cystitis from this symptom alone. When renal disease is superadded to cystitis, the characteristic casts will be found and albumen will likely be increased in amount.