12 Kennedy, Practitioner, vol. xx. p. 95.
The drug most frequently employed, and which can claim a larger proportion of successes than any other, is ergot in full doses, half a drachm or a drachm (2 to 4 cubic centimeters of the fluid extract) several times per diem. Its method of action is undoubtedly in the contracting effect which it exercises on the renal arterioles. In many cases it has decidedly diminished the amount of urine, and in some a permanent cure seems to have resulted.
In estimating the value of drugs in certain cases of this affection its not infrequent neurotic origin should be borne in mind, as well as the very capricious effect of supposed remedies in the hysterical diathesis. Unfortunately, many cases remain rebellious to all drugs, and can only be rendered as little uncomfortable as possible.
What has been said of treatment applies only to the well-marked cases of diabetes insipidus. Polyuria, as a symptom of other diseases or of surgical affections, is hardly likely to call for treatment other than that of the disease upon which it depends.
Albuminuria.
Albuminuria signifies a condition in which albumen appears in the urine, and has by some writers been made of equal significance with nephritis or Bright's disease. It is hardly necessary to say that this coincidence is far from being an exact one, and that the symptom may exist without Bright's disease, and also Bright's disease without the symptom. For our present purposes albuminuria will be taken to mean those conditions in which albumen may be found in the urine without the existence of decided diffuse nephritis. As a symptom, and a highly important one, of Bright's disease it will be considered elsewhere.
Albumen is secreted in the kidneys chiefly in the Malpighian capsules, where, if at all abundant, it may be easily demonstrated after death by hardening the kidneys by boiling. This coagulates the albumen in situ, where it may be shown by sections prepared in the usual method. It has been supposed that albumen is normally secreted in the capsules of the healthy kidney, and afterward absorbed by the epithelium lower down; but this view can easily be shown to be erroneous by subjecting a kidney which has not secreted albuminous urine to the process just described, which shows no coagulated albumen in the place where it ought to be most abundant.
The albumen found in the urine is chiefly that which forms the most important portion of the blood-serum, although other albuminoid bodies have from time to time made their appearance and have some diagnostic importance. Semmola13 states that the albumen appearing in the urine in true Bright's disease differs from that found with the cardiac or amyloid kidney. The distinction can, according to him, be shown in the appearance of the precipitate to a practised observer, and also by a more rapid diffusibility through animal membranes. He admits, however, that he has in vain sought for any distinct and clear chemical test by which the difference can be recognized.
13 Archives de Physiologie, 2d Serie, tome ix., and 3d Serie, tome iv.
Fibrin may occur in inflammatory conditions in the form of coagulated masses, and hence cannot affect the question of the presence of albumen. Casein has not been detected with certainty. Various albuminoid bodies, called albuminose, paralbumen, metalbumen, and serum-globulin, are occasionally met with in renal disease, and may give rise to some confusion during an analysis. They are at present, however, more suitable for chemical than for clinical study.