4. Acute Bright's disease is one of the most serious disorders occurring in the course of pregnancy. The urine is diminished in quantity, and contains a large amount of albumen, tube-casts, and red blood-corpuscles. Eclampsia is of frequent occurrence, and usually induces abortion or premature labor.
The causes of renal disease and of its symptom albuminuria are not always evident. In the kidney of pregnancy there is no inflammatory change. The cells covering the glomeruli and the glandular cells lining the uriniferous tubules undergo fatty degeneration, and are cast off as the result of anæmia.
In the acute and chronic forms of renal inflammation there is a variety of probable etiological factors. Mechanical pressure from the gravid uterus may impede the return of venous blood and determine congestion of the kidneys. This explanation is rendered more probable by the fact that albumen usually appears in the urine after the fifth month, when the uterus has attained considerable size. Albuminuria is of comparatively more frequent occurrence in primiparæ with tense abdominal walls. It is frequently observed in cases of large ovarian cysts and uterine fibroids. The increased functional activity of the organs, the elevation of blood-pressure, the alterations in the constitution of the blood, are doubtless potential factors. When any latent tendency to Bright's disease exists, exposure to cold and impeded cutaneous functional activity are more likely to develop the disease in the pregnant than in the non-gravid state. Compression of the ureters is regarded by Halbertsma as a cause of great importance.
SYMPTOMS.—The symptoms of Bright's disease in pregnancy are neither uniform nor constantly present. Anasarca frequently directs attention to the patient's condition long before the appearance of more significant signs. Oedematous swellings of the face, hands, arms, feet, legs, and labia majora are always suspicious, and should lead to an examination of the urine. These oedematous swellings are wandering—appear when the patient is lying down, and disappear when she rises and walks about. Sometimes, toward the end of pregnancy, they become less marked, not infrequently entirely disappearing, while the albuminuria is increasing. The skin covering the oedematous portions of the body is dry, of a chalkish-white appearance, and the surface temperature is depressed.
Anomalous nervous phenomena, such as headache, vertigo, dimness of vision, spots before the eyes, ringing in the ears, sudden deafness, obstinate nausea and vomiting, sleeplessness, neuralgia, are often observed, and should always excite suspicion. These various nervous symptoms may be viewed as produced by the retention within the blood of certain substances normally excreted by the kidneys.
Convulsions, due to renal insufficiency, may occur during pregnancy, but are observed more frequently during parturition and the puerperium.
Attention has already been called to the characters of the urine. It is necessary to remember that in the granular, contracted kidney and lardaceous degeneration albuminuria may escape observation.
Bright's disease strongly predisposes to abortion or premature labor.
PROGNOSIS.—Any organic disease of the kidneys is serious. When the disease is extensive and involves both organs the prognosis is especially unfavorable. Accurate conclusions as to the dangers of Bright's disease during pregnancy are not justified by the present state of our knowledge. It is only possible to say, in a general way, that the prospect of recovery is less favorable than in the non-gravid state. Owing to the strong predisposition to abortion and premature labor, the chances of the foetus surviving pregnancy are relatively slight. Even if the child is not prematurely expelled from the uterus, it usually succumbs to the influence of the excrementitious products retained within the maternal blood.
TREATMENT.—In view of the serious complications arising in pregnancy from interference with the functions of the kidneys, the absolute necessity of chemical examination of the urine at regular intervals in every case, especially during the latter half of gestation, is apparent. When pathological albuminuria is present, rational therapy will be directed to the removal of the cause. Evacuation of the uterine contents is the only mode of removing the pressure from the gravid uterus, but we have a variety of expedients, hygienic and medical, which must be invoked before resorting to such a radical procedure.