Chapter II: Front Matter (2)

It is very rare, if indeed it ever happens, for life to be terminated by diabetes insipidus unaccompanied by any other disease, although from its association with many and severe affections, both of the nervous system and of the kidneys, it must of course not unfrequently happen that a patient dies in, though not on account of, the polyuric state. It is strange to observe, however, as has been often before remarked, how thin a shell of renal structure will suffice to carry on not only the usual, but an excessive, flow of water.

The ORIGIN of diabetes insipidus has been found in several conditions. Greater disposition toward it exists in early life, although it is by no means confined to youth. After middle life polyuria is likely to awaken the suspicion either of chronic interstitial nephritis or of prostatic disease, or other affection of the urinary passages setting up a sympathetic irritation of the kidney. It has been found to originate during convalescence from acute diseases, with perhaps preference for meningitis. Syphilis has its share of cases, as in most other organic nervous diseases. Shocks of various kinds, including fright, sudden or prolonged immersion in cold water, the rapid ingestion of large quantities either of water or of alcoholic fluids, are undoubted potent factors. In this respect, again, we may see the resemblance between diabetes without sugar and true or saccharine diabetes. It is favored by the hysterical diathesis. A very interesting case of severe hysteria with hemianæsthesia and hemiplegia and other marked symptoms varied for a time between almost complete anuria and the most profuse discharge of over two hundred ounces per diem.

A most interesting group of cases has been recorded by Weil,[10] where out of a family of 91, 28 were polyuric. The head of the family, a polyuric, lived to the age of eighty-three, while his descendants were robust, many of them attaining a good old age. There were no anomalies of the circulation, and the persons affected were not alcoholics. Their only complaint was of a troublesome thirst, and they declined treatment.

[Footnote 10: _Cbl. für die Med. Wiss._, 1884, p. 263, from _Virch. Arch._, xcv.]

The PATHOLOGY of diabetes insipidus, so far as is positively known, may be gathered from the previous account of its etiology and symptoms. It is evidently of nervous origin in the great majority if not all cases. It is often connected with distinct lesions of the nervous system, and attended with other nervous symptoms. In some cases it occurs in connection with a well-marked hysterical diathesis. The copious flow of pale urine as a sequel to the hysterical paroxysm is well known, and the same thing often attends a severe nervous headache in either sex. It is probable that the polyuria attending lesions of the urinary passages is a reflex nervous phenomenon, since it may be present when there is no suspicion of organic renal disease.

Guyon[11] states that surgical polyuria occurs under three {32} conditions--painful excitation of the sensibility of the deeper portion of the urethra or the vesical mucous membrane; repeated attempts to urinate during the night; retention of urine more or less complete, but especially when there is distension of the bladder. Of the first cause he gives an instance in the case of a young man who had a polyuria whenever a bougie was passed beyond a urethral stricture.

[Footnote 11: _Leçons cliniques sur les Maladies des Voies urinaires_, Paris, 1881.]

Where, however, polyuria, especially chronic, is due to habitual over-distension, it is in the highest degree probable that it is at least partly due to structural alteration of the kidney. The well-known experiment of Bernard, by which an increased flow of urine was induced by a puncture of the floor of the fourth ventricle, and those of Eckhard on section of the splanchnic nerves, show how it is possible for nervous affections to influence the secretion of urine, though the path or paths of the influence are by no means completely made out.

One of the most noticeable points in the pathology of the more excessive cases of polyuria is the disproportion which often exists between the amount of fluid ingested and the amount discharged, the latter often exceeding the former several times. The source of the excess of water has not been satisfactorily determined, but it is evident from a careful experiment of Watson, repeated by Dickenson, that the body has under some circumstances the power of appropriating water from the atmosphere instead of discharging aqueous vapor through the lungs and skin as usual. In the experiments referred to persons affected with extreme polyuria were weighed immediately after passing water, and again after as long an interval as they were able to restrain their thirst, of course being also without food and under observation, when it was found that the weight had been increased by a number of ounces. In Dickenson's case, weighing thirty pounds more or less, where the amount of urine excreted daily was from seven to nine liters, the gain in weight at several observations was as follows: in three hours, 15½ oz.; in five hours twenty minutes, 19¾ oz.; in three and a half hours, 3¾ oz.

The DIAGNOSIS of this affection rests, in the first place, upon the determination of a permanent increase in the quantity of urine passed considerably above the normal, and, as has been already remarked, may require a measurement of the daily amount--a procedure which it is well to make a matter of routine in any cases where urinary trouble may be present. The increase being found, if it be very great it will only remain to determine whether sugar be present, which will be indicated by the specific gravity and the appropriate chemical tests. Traces of sugar are sometimes found in cases of polyuria which do not present the characteristics of saccharine diabetes, and can hardly be considered to materially affect the character of the disease.

A specific gravity decidedly above normal, with an excessive quantity of urine, is not likely to belong to anything but diabetes mellitus, though the chemical tests should never be neglected. If, however, the polyuria be only moderate, it becomes necessary to exclude surgical affections of the urinary passages, especially an enlarged prostate, often attended with retention and distended bladder. Pyelitis and hydro-nephrosis may also give rise to the same condition of over-activity of the kidneys. The appropriate surgical examinations with the sound may be necessary, but the presence of pus, bacteria, and the epithelium of the urinary passages {33} in the surgical urine, as well as its frequent alkalinity, may direct a very strong suspicion before the sound is used. The age of the patient also will be of considerable weight in this connection.

A point of real difficulty of diagnosis, and great importance for treatment and prognosis, is the distinction between simple polyuria not excessive, but attended by constitutional symptoms, such as impaired nutrition, dyspepsia, and severe headache, from chronic interstitial nephritis, which often makes its appearance with similar symptoms. Mistakes between these two affections have undoubtedly occurred, and can in many cases hardly be avoided except by reserving the diagnosis for a time.

The similarity is rendered still more deceptive by the undoubted occurrence of a trace of albumen or a hyaline cast or two in cases of nervous disturbance, without justifying a diagnosis of progressive renal disease. High arterial tension also is likely to be found in both conditions. Nothing but repeated and careful examinations of the urine and of the circulation, especially at times when the nervous symptoms are less marked, and often a considerable amount of time, can fix the diagnosis.

Hypertrophy of the heart, and even slight dropsy, will undoubtedly be extremely decisive symptoms, but are not likely to occur until after a time when the doubt no longer exists. In other cases it may be highly important to carefully exclude organic cerebral disease before making a diagnosis of simple polyuria.

It is hardly appropriate to speak of a diagnosis from azoturia or phosphaturia, since these conditions are extremely likely to exist coincidently with typical polyuria and to make a part of the same disease. It is of much importance, however, to ascertain their presence with reference to the probable effect of the disease on the nutrition.

In regard to the TREATMENT, it may be remarked, to begin with, that restriction of water, although naturally diminishing somewhat the discharge of urine, does not cure the disease, but, on the contrary, in many cases augments not only the discomfort of the patient, but tends to the dryness of the skin, dyspeptic and nervous disturbances, and emaciation. Patients may recover flesh, strength, and spirits on being allowed to drink ad libitum, even although the inconvenience of excessive urination be thereby somewhat increased. Sufficient food and drink should therefore be allowed, although a patient may be ordered to observe such moderation as will not put his powers of endurance to too severe a test.

Of the drugs proposed, nearly all have offered some prospect of success, and have been accordingly reckoned almost specifics. Opium has in some cases been found as useful in these cases as in diabetes mellitus, and probably, as in that disease, by diminishing the sensitiveness of the nervous system. Valerian and valerianate of zinc, recommended by Trousseau and apparently successful in his hands, have reckoned both failures and successes in the hands of others. Nitric acid, in the dose of from 1 to 5 drachms per diem of the dilute in a large quantity of water, is said to have been highly efficacious in one series of cases.[12] It is given until aching of the jaws and teeth, with some gingivitis, denoting its constitutional action, is produced. It was more successful than any other drug in Marion's case, although the specific symptoms were not produced, the patient being now in good health or free from {34} her trouble. Atropia from its general action in diminishing secretion has been tried, and with occasional alleged success, but with many more failures. Pilocarpine from its action on the skin might be of value in those cases where the skin is very dry, but has no very general applicability.

[Footnote 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. Semmola[13] 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 {35} 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.

[Footnote 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.

A variety of albumen is said to occur in osteomalacia which is not coagulated by heat alone nor by heat and nitric acid. This has been called Bence Jones's albumen, but has been seen by others. Peptone has been found in urine, but usually in such specimens as have been or which afterward become albuminous. Its exact signification when alone cannot be more exactly stated, as it has appeared in a variety of diseases, though not in perfect health.

Finally, a protein body, a ferment called nephrozymase, may be thrown down from every urine by an excess of alcohol.

Hæmoglobin gives a dark-red color to the urine, which on boiling forms a brown coagulum floating on the surface.

Hæmoglobinuria may be produced in animals by the intravenous injection of large quantities of water, causing a dissolution of the corpuscles, but the degree of hydræmia necessary to produce this condition is much in excess of any met with in diseases of the human being.

Human hæmoglobinuria may be the result of various pathological conditions, among which may be mentioned some infectious diseases, jaundice, burns, and the effects of many poisons, as well as the transfusion of sheep's blood.

Intermittent hæmoglobinuria, which is attended with fever, is usually the result of cold acting upon predisposed persons. The color of the urine and of the coagulum, together with the absence of red corpuscles under the microscope, will distinguish urine of this character from others which are also coagulable by heat.

Several methods are in use for the detection of albumen. Of these, boiling is perhaps the oldest and most generally employed, and if conducted with due care is a very delicate and useful test. The urine to be tested should be clear and slightly acid, when on boiling the albumen, if present, will be precipitated in whitish flocculi, more or less abundant according to the amount, or, if the quantity is very small, as a turbidity. The flocculi soon settle to the bottom of the tube when it cools, and the thickness of the deposit formed gives an approximation to a quantitative estimate. It is to the proportionate thickness of this deposit that the terms 30 or 50 per cent. of albumen are commonly but incorrectly applied. If the quantity is very small, it may not be distinctly perceptible until after cooling.

If alkaline or very slightly acid urine is boiled, a deposit of phosphates will be thrown down which closely resembles that from albumen, while, on the other hand, the albumen remains undissolved unless in large amount. These deposits of phosphates differ a little in appearance from {36} an albuminous one, but in order to be accurate acetic or nitric acid should be added, drop by drop, to the hot urine, when the phosphates will be redissolved and the albumen, if present, precipitated. It is better, however, to add the acid cautiously to the point of slight acidity before boiling. A recent work[14] gives the following directions for this reaction, which is then "absolutely conclusive and surpassed in delicacy by no other:" "The urine is first made distinctly acid with some drops of acetic acid, and then about one-sixth of its volume of a concentrated solution of chloride of sodium or sulphate of sodium or magnesium added. If the urine contains albumen, a precipitate of coarser or finer flakes appears on boiling." This reaction may be used as a quantitative test by diluting and acidifying, if necessary, a known quantity of urine, washing the precipitate on a weighed filter, drying, and weighing the whole.

[Footnote 14: _Die Lehre vom Harn_, Salkowski und Leube.]

An exceedingly delicate and convenient test is that by nitric acid. The acid is placed in the bottom of a conical wine-glass, and the urine, filtered if necessary, allowed to flow on top of it from a pipette, so as to disturb the plane of junction of the two fluids as little as possible, and leave a distinct line of demarcation. At this plane of union, if albumen be present, will be formed an opaque white line varying in thickness according to the amount of albumen, so that after some practice and with care an approximate estimate of the percentage may be made. A deposit of urates may sometimes be formed a little above the plane of union, but it may be distinguished by its position, by its less distinct limitation on the upper surface, and also by its disappearance on warming. In a very concentrated urine and in cold weather this error may be conveniently avoided by previous warming of the urine and of the reagent. The same remark applies to the brine test.

A crystalline precipitate of nitrate of urea may give rise to error if the urine be very concentrated or the experiment conducted in the cold. This may be distinguished by its disappearance on warming or by the microscope. The action of the nitric acid on the coloring matter of the urine, forming a dark band at the point of junction, may obscure the reaction, but with care will not give rise to mistakes.

Another test recently introduced, which presents some advantages over the nitric acid, and is certainly quite as delicate, consists in a saturated solution of common salt in water acidulated with about 5 per cent. of the dilute hydrochloric acid of the _Pharmacopoeia_. This solution should be used exactly in the manner described for nitric acid. There is no change of color at the line of junction, and no precipitate takes place there except albumen or peptone, or resins when they have been administered. The opaque line of precipitate may, if the amount of albumen present be small, require a short time to form, so that in cases of doubt it is well to allow the test-glass to stand for a few minutes. It will, however, show very distinctly in any cases in which nitric acid shows any precipitate. The line does not, however, increase in thickness and density in proportion to the amount of albumen so exactly as that produced by nitric acid, so that the brine test is not so useful for approximately quantitative use as the nitric acid, although fully as delicate. If it be desired to distinguish peptone from albumen, it may be done by a comparison of this test {37} with the nitric acid, which does not throw down peptone. If a deposit occur, which may consist of resin, the addition of more urine will dissolve it if resin, while albumen will not be affected.

Picric acid is a delicate and often a convenient test. The dry acid may be dissolved in the urine, or a saturated solution used into which the urine may be slowly dropped, each drop making a slight whitish cloud as it slowly falls through the yellow solution.

The iodo-hydrargyrate of potassium is perhaps the most delicate test of all: Potassii iodidi, 3.32 gm.; Hydrarg. bichlor., 1.35 gm.; Acidi acetici, 20 c.c.; Aq. destill. q. s. ut fiat 100 c.c.--Tauret's test. It may be used in the same way as the nitric acid or brine, or simply intermixed. Its only disadvantage is that it throws down alkaloids, but as this will not happen unless the alkaloid be taken in large quantity--as might happen, for instance, in the case of quinine--the chances of error from this source are not very great if this peculiarity be borne in mind.

Ferrocyanide of potassium in an acid solution has recently been proposed as a convenient test. It may be made up into pellets with citric acid or used in the same combination in the form of papers.

The phenic-acid test is prepared as follows:

Ac. phenic. glacial. (95 per cent.), drachm ij;
Ac. acet. puri., drachm vij;
M. Add liq. potassæ, ounce ij-drachm vj.
Millard.

This is said to be very delicate, but the writer has no experience with it.

Tungstate of sodium is another recent addition to the list, which it is evident is already long enough for practical purposes.

Several of the tests mentioned have recently been prepared in the form of papers saturated with known quantities of the reagent and dried. They may be carried in the pocket-book and applied at the bedside, if desired, in a test-tube small enough to be very conveniently carried in the vest pocket. The iodo-hydrargyrate is perhaps the most useful. It is the most delicate, and a plan has been proposed for making with it a quantitative estimate of considerable accuracy by means of a standard solution or piece of gray glass adjusted by such a solution, with which the precipitate produced can be compared as to its opacity.

Exact quantitative examinations for albumen may be made by several processes, but that by boiling, if carried out with the precautions described in works on chemistry, is as accurate as any, and probably the best adapted to the needs of the practitioner if he should wish for such results.

For clinical purposes, however, it will rarely if ever be found useful to determine the amount of albumen more accurately than can be done by the various approximations mentioned above.

When even the smallest trace of albumen is discoverable by any of these methods, the question of the integrity of the kidneys at once arises--a question which a few years ago would have been considered as settled in the unfavorable sense by the same occurrence.

It is necessary to distinguish, first of all, between an essential and an accidental albuminuria, the first referring to that condition where the albumen is secreted with the urine and forms an essential part of it, and {38} the other to the accidental admixture from the presence of pus or blood, which may have made its appearance at any point below the secreting tubes. When hemorrhage takes place from the kidney, albumen is of course present in the urine, but its signification under these circumstances is entirely different from that which it bears when unaccompanied by the corpuscular elements of the blood.

No means at present exist for determining whether a small amount of albumen present in the urine is more than enough to be accounted for by the pus or blood known to exist by the presence of its corpuscular elements or of its coloring matter. An approximate estimate may be made by one familiar with such examinations, but no rule can yet be laid down. Such a rule might be approximately established by a succession of counts with the hæmocytometer of the corpuscles found in albuminous urine of known percentage, or estimates of hæmoglobin by color tests.

The exact conditions of the kidney or of the blood which may cause the appearance in the urine of albumen without blood or pus--that is, of true albuminuria--have been the subject of much experiment and argument, which it would be impossible to reproduce, even in outline, within the limits of this article; and this is the less to be regretted since they have as yet led to no practical or generally accepted conclusion. A few of the more important facts bearing on the question may, however, be stated here.

Albumen other than serum-albumen, when introduced into the circulation either by injection into the veins subcutaneously, or if in very large quantity by the mouth, is rapidly excreted by the kidneys. This albumen also, if collected from the urine of the first animal and injected into the vein of a second, again comes through the kidneys. The albumen, however, which is obtained from the urine of an ordinary case of albuminuria--that is, serum-albumen--does not behave in this way, but is not excreted through healthy kidneys. These facts seem to show that the appearance of albumen in the urine in ordinary cases of renal disease is not to be attributed to any change in its quality approximating it to egg-albumen, for instance, but is due to the condition of the kidneys.

Disturbances of the renal circulation, especially those giving rise to venous stasis, are very likely to cause albuminuria; a temporary ligature of the renal vein causes albumen to appear in the urine after its removal, and ligature of the ureter has the same effect.

The albuminuria succeeding the collapse of Asiatic cholera or yellow fever seems to have a somewhat similar origin, being the result of re-establishment of the circulation after extreme anæmia of the kidney. Clinical facts in general seem to point to simple disturbance of the circulation and to alterations in the kidneys themselves as the usual causes of albuminuria, though in many cases the lesion seems to be a slight and temporary one.

Some other conditions under which such disturbances and alterations may arise, exclusive of Bright's disease, are the following:

Munn[15] found albumen in small quantities in 11 per cent. of cases presenting themselves for life insurance, supposing themselves healthy and having no lesions of heart or lungs. It is not stated whether casts were found in these cases or not, and their value as representing healthy {39} persons cannot, it is obvious, be correctly estimated until some time has elapsed. It is well known that renal lesions may be exceedingly slow in their progress, and it is by no means improbable that a part of these cases may have been really in the early stages of a chronic form of Bright's disease. Albumen has been found in the urine of boys and adolescents, as well as in that of healthy soldiers, tested immediately after rising: in most of these cases the amount was extremely small. Certain conditions, moreover, may greatly increase the proportion of cases in these same classes in which albumen is present. Thus, fatiguing exercise will bring it on in some persons, and the urine of a body of soldiers if examined late in the day after severe drill shows a much larger proportion of albuminurics than if examined after rising. The urine of the pedestrian Weston is said to have contained not only albumen, but casts. It is certainly not true that fatiguing exercise will cause albuminuria in everybody, and it is not claimed, even by those who report these and similar cases, that they prove albumen to be a normal constituent. Some of the cases are distinctly described as delicate without being actually ill. Cases have been reported where cold bathing has been followed by temporary albuminuria. Here it is in the highest degree probable that a disturbance in the circulation is produced by contraction of the cutaneous arterioles; and it is possible that we may find in this increased sensitiveness of certain persons an explanation of the occurrence of acute dropsy as a sequel to scarlatina or as the result of exposure in only a small proportion of the cases where the exposure takes place. It is hardly necessary to admit, on the basis of these observations, that albumen is a constituent of healthy urine, although this may be shown at some future day by still more delicate tests, but simply that the renal circulation may in certain sensitive persons be sufficiently influenced by slight and transient causes to permit albumen to pass into the urine. It is the almost unanimous conclusion of practical writers, taking fully into the account these recently-ascertained facts of albuminuria in alleged health, that the presence of albumen in the urine in sufficient quantity to be detected by any of the ordinary tests is a decidedly serious symptom.

[Footnote 15: _New York Medical Record_, xv. 297.]

The influence of many well-recognized pathological states in bringing about venous stasis, and that delay of the blood in the renal--and more especially the Malpighian--vessels which seems the most essential factor in the secretion of albumen, is well known, and its recognition is of much importance in diagnosis and prognosis, since the unfavorable signification of albuminuria in certain cases is liable to be overrated, and a diagnosis of chronic renal disease made to depend upon symptoms which really belong to some other affection. How far alteration in the capillaries and epithelium is in each case concerned in the production of albuminuria it is often impossible to say, since any alteration in these elements which can be observed after death is almost certain to be complicated with lesions which can disturb the local circulation.

Cardiac obstructive disease is very likely to be accompanied by albuminuria, and the state of the kidneys by which this condition is brought about is undoubtedly venous congestion. The urine in a case of this kind is usually scanty, of high specific gravity, high colored, often with a deposit of urates, while the albumen appears in small quantity. A few {40} hyaline casts are not infrequently seen, and do not materially increase the gravity of the prognosis so far as renal disease is concerned. The kidney which furnishes this urine is usually a little harder and a little denser than normal, but with a nearly normal microscopic structure, exhibiting but little more than capillaries well filled with blood, and in the interior of some of the tubes casts similar to those found in the urine during life.

Doubt may occasionally arise as to the diagnosis between a congested kidney consequent upon valvular disease of the heart and an interstitial nephritis with hypertrophy of the heart. In the latter case, however, the urine, although containing albumen, is usually much more copious and of low specific gravity. Diminished power of the heart without valvular lesion may have as a consequence albuminuria which disappears if the heart recovers its vigor.

In many of the cases in which albumen appears in the urine temporarily it is not easy to say whether an actual nephritis may not be present, though not sufficiently severe to give rise to other symptoms.

In almost any febrile disease of sufficient intensity albumen is often found, and when such a case terminates fatally without renal symptoms, the condition of the kidneys, consisting in more or less granular degeneration of the epithelium, is often spoken of as parenchymatous nephritis. If it is correctly called so, it is certainly very different from the idiopathic form, whether acute or chronic, since it is very rare for typhoid fever, for example, either to present the symptoms of acute nephritis during life or to terminate in chronic Bright's disease. In scarlatina, and rarely in other fevers, a distinct nephritis is present, but a degeneration of structure sufficient to produce albuminuria is in many instances a result merely of a high temperature.

Many applications to the skin produce albuminuria, but in almost all, if not all, of these an actual nephritis has been found to exist. The same is true of poisoning with strong acids, phosphorus, and arsenic.

A very important form of albuminuria is that found during pregnancy, more frequent with a first child or with twin pregnancy, and often associated with other symptoms of nephritis. It is probable, however, that in many instances it is a result of impeded abdominal circulation, although it is very rarely that the gravid uterus can press directly on the renal veins. In the severer cases a well-marked parenchymatous nephritis exists; but it should be distinctly borne in mind that if every instance of albuminuria in pregnancy is due to nephritis, it is certainly a form of the disease which may lead neither to severe symptoms nor to chronic disease. On the other hand, the appearance of albumen in the urine of a pregnant woman, though not necessarily calling for active interference of any kind, should always be a danger-signal, and put the physician on the lookout for other indications of actual renal disease.

In many nervous affections albumen may be found in the urine. It can be produced, as was shown long ago by Bernard, by a puncture in the floor of the fourth ventricle near to the point where a similar puncture gives rise to diabetes. Lesion of the cerebral peduncles, section, destruction, or irritation of the spinal cord, and irritation of the renal nerves are also causes of this symptom. It is by no means difficult to account for this phenomenon by the changes which take place in the {41} renal circulation under influence of the vaso-motor nerves which originate or pass through the peduncles, pons, and spinal cord, although it is highly probable that similar results might follow irritation transmitted from a distance. These facts are not without practical importance, for they give rise to very considerable chances of error in diagnosis; as, for instance, where a patient suffering from severe headache, with possibly gastric symptoms, is found to have albumen and casts in his urine, which is also copious and of low specific gravity. It might not be easy to decide that such a case was not one of interstitial nephritis with symptoms far from unusual, and yet it might perfectly well be a cerebral tumor. The diagnosis would demand a thorough search for other symptoms, such as double optic neuritis on the one hand, as indicating cerebral disease and cardiac hypertrophy, with high arterial tension on the other, as connected with nephritis. A careful consideration of the order of their occurrence is also desirable.

After an epileptic attack albumen may appear in the urine for a short time, disappearing within a few hours. This occurrence might lead to an erroneous diagnosis of uræmic convulsions if the examination happened to be made shortly after a fit and not repeated at a later period. Transitory mania may perhaps be placed in the same category.

Chronic mental disease, like general paralysis of the insane, is frequently accompanied by albuminuria, and even temporary mental disturbance in a sensitive person has been known to excite the symptom.

In narcotic poisoning both by alcohol and by opium a similar state of things sometimes occurs. With alcohol, however, distinction is to be made between chronic cases, where a suspicion of parenchymatous nephritis may be fairly entertained, and acute alcoholism or delirium tremens, where the albumen appears and disappears within a few days. In a patient profoundly under the influence of opium the urine may contain not only albumen, but casts, and the diagnosis of uræmic coma is very likely to be made if nothing is known about the history--an error which might be of great consequence, as tending to discourage the efficient treatment necessary in opium-poisoning or causing the waste of time on inefficient measures.

It is obvious from what has been said that the diagnosis of albuminuria as a symptom is sufficiently simple with a little care in chemical manipulation, but that its significance is not so easy to determine in every case, since it is found in so many cases unconnected with chronic or progressive renal disease, and on the other hand may be absent while serious nephritis is going on.

Albuminuria, as defined at the beginning of this article--that is, occurring in the absence of chronic and serious renal disease--is only to be diagnosticated by the exclusion of such diseases, by careful consideration of all the symptoms present, such as changes in the quantity and specific gravity of the urine, in the force, rhythm, and size of the heart, and of the arterial tension, as well as the relation of the amount of albumen to the amount of urine and character of the sediment as indicating one or the other form of nephritis. Thus a very small amount of albumen with a highly concentrated urine is not likely to be met with in the usual forms of nephritis, but is often found in connection with valvular disease of the heart.

{42} Treatment is but rarely directed to this symptom, since, when albumen is present in but small quantity, as usually happens, it is of little or no consequence except as an important element in diagnosis, while the few cases in which the amount is large enough to constitute a serious drain upon the system are almost exclusively cases of actual Bright's disease, and hence do not come under this head. The administration of astringents, especially tannic and gallic acids, has been found to diminish the quantity of albumen in the urine.

(A copious bibliography of this subject will be found in an article by Ellis in the _Boston Medical and Surgical Journal_, vol. i., 1880.)

Renal Colic; Renal Calculus.

Renal colic is the appellation of a group of symptoms caused, in by far the greater proportion of cases, by the passage of a renal calculus through the ureter, or sometimes merely its engagement in the upper extremity and impaction or subsequent falling back. Other foreign bodies large enough to cause distension and obstruction, such as clots of fibrin or portions of hydatid cysts, may give rise to the same phenomena. Most physicians, however, have seen cases where the same set of symptoms have not been followed either by the discharge of the stone per urethram or by evidence of its continued sojourn anywhere in the urinary organs. They may occur in persons of a neuralgic tendency in connection with the uric or oxalic diathesis. The conclusiveness of such cases, as proving the possibility of a purely neuralgic or spasmodic attack, must of course depend upon the carefulness and intelligence of the patient and the opportunities of the physician for observation extending over years. As it is admitted, however, that these symptoms may occur without the demonstrated presence of a calculus, it would be perhaps better nomenclature to apply the term renal colic to painful and spasmodic affections of the kidney and ureter, however caused, and to describe the passage of a calculus or other obstruction under its own name.

Calculi of various kinds, sizes, and shapes may be found in the pelvis of the kidney. They are most frequently composed of uric acid, which may exist alone or with layers of phosphates superimposed. They are usually in concentric layers, more or less irregular in shape, and of a reddish-brown color of various shades. Soft concretions of urates are occasionally noted. Oxalate of lime is the material of many small calculi, and may be the nucleus of a larger one or occur in alternate layers with uric acid. These stones are of a dark grayish-brown and are exceedingly rough and irritating. Among the most frequent constituents of renal calculi are to be found phosphates, either of lime or the triple salt of ammonia and magnesia. They may form layers with other material, or constitute alone the largest and most curiously shaped of all the renal calculi. Their surface may be smooth and almost polished, or roughened, eroded, and almost crystalline in texture.

Cystine rarely forms a renal calculus, and xanthic oxide still more rarely. Masses of fibrin resulting from renal hemorrhage are described. They are said to be of the consistency of wax, tough and elastic. Coagula of the ordinary form may also give rise to the same set of symptoms. {43} On one occasion the writer saw the dilated pelvis of the kidney filled with hundreds of spherical brownish soft masses from the size of a mustard-seed to that of a pea, easily crushed in the fingers, burning with the smell of albumen, and leaving but a small amount of ash.

The size of renal calculi may vary from almost microscopic grains, which then usually take the collective name of sand or gravel, and are most commonly composed of uric acid, up to masses of some ounces in weight, completely filling a dilated pelvis.

It is doubtful in what way renal calculi originate, their constituents being always present in the urine, but rarely crystallizing out. The uric-acid infarction of new-born children can hardly be considered as accounting for any large number of cases, although it might be the basis of calculi in young children. The uric and phosphatic deposits sometimes found in the tubes of the more mature kidney may possibly, when dislodged, be a point upon which additional quantities of the same substances are deposited, but anything which delays in the pelvis or in some of its calices a concentrated urine, especially if much mucus be present, may be regarded as favoring the agglomeration of deposits. A previous pyelitis is perhaps the usual cause of phosphatic deposits. Small uric-acid calculi may sometimes be found in considerable numbers in the sulcus surrounding some of the papillæ, and of a size which could hardly afford any marked symptoms in passing down the ureter. These, if any inflammation were to arise, would form a mass with pus or mucus which might serve as a nucleus for a phosphatic calculus. These suppositions are, however, rather theoretical and fragmentary, and do not cover all the cases. Constitutional predisposition has been much discussed, though not a great deal is known about it. A gouty tendency, however, undoubtedly favors the production of uric-acid calculi.

A small renal calculus, when formed, may be the beginning of several quite different sets of phenomena. Of these, the simplest and most favorable event is its descent through the ureter into the bladder, with its subsequent expulsion with the jet of urine from the urethra. If the calculus be small and smooth, the passage through the ureter may be attended with little or no uneasiness, but if it is large enough to fill or distend the tube, and especially if the stone be irregular and rough, its descent gives rise to excessively severe symptoms. These are pain in the back at the level of the kidney, in the side and groin corresponding to the ureter affected, sometimes shooting down the thigh; with retraction of the testicle; usually no fever, but much general depression; feeble pulse, coldness and paleness of the surface, fainting, and vomiting. The beginning of the attack is usually sudden, corresponding to the entrance of the calculus into the ureter, and the pain continues without intermission, though with some remissions, until its discharge into the bladder. The pain is usually of the severest, and is described as cutting or tearing in character. It is probable that an attack may sometimes end by the calculus, which has become engaged in the ureter, falling back into the pelvis instead of advancing through the ureter. In this case the pain ceases for the time, to be perhaps subsequently renewed, or, if the stone grow larger, so that it cannot re-enter the ureter, giving place to the symptoms due to irritation of the pelvis.

The urine is usually diminished in amount until the arrival of the {44} calculus at the bladder, when the fluid that has been retained is suddenly discharged with the stone. Constant attempts to pass water during the passage downward of the calculus are the consequence of sympathetic irritation of the bladder, and not of accumulation of urine therein. The urine is likely to be bloody, but is not necessarily so. The smoothness or roughness of the surface of the stone is of much importance as determining the presence of this symptom.

The DIAGNOSIS of renal colic is usually not difficult, but it may not always be readily distinguished from hepatic or intestinal colic. The suddenness of the attack and intensity of the pain, its location in the side and downward to the groin, will in most cases make the condition very characteristic.

From hepatic colic or the passage of a gall-stone the situation of the pain, which is in the latter affection naturally somewhat farther forward, the tenderness on pressure in the same region, and often the whitish color of the stools or the presence of jaundice, as well as the history of former attacks, will usually make the distinction a matter of a high degree of probability.

Intestinal colic is usually referred to the middle of the abdomen, is accompanied by constipation, while the movements of the intestines and of flatus are often distinctly perceived by the sensation of the patient or the ears of the bystanders, and on the whole the attack is less severe and the pain less intense.

As has already been stated, it is probable that symptoms closely resembling if not identical with those of the passage of a calculus may occur when the substantial cause of them does not make its appearance; and although many of these may perhaps be accounted for by the ill-success of the search or by the calculus having ceased to pursue its downward course and having become quiescent in the kidney, yet it is well for the practitioner to be prepared for an occasional disappointment in obtaining tangible proof of the nature of the attack. Time may be required to decide whether an attack is due to calculus, or is simply one of the spasmodic or neuralgic paroxysms mentioned above.

If after careful watching no stone makes its appearance, and on the other hand the pain does not continue and no pus gives evidence of pyelitis, it is highly probable that no stone is or has been present.

A true neuralgia of the kidney may undoubtedly exist. Lumbago and lumbar neuralgia may simulate renal colic, but are almost always much less severe, the pain less sharp and more dull and aching, aggravated by movement, while the sympathetic phenomena, especially those connected with the urinary apparatus, are wanting.

The diagnosis of the character of the calculus can sometimes be made with a reasonable degree of probability. If crystals of uric acid or of oxalate of lime have been or are present in considerable quantity, it is highly probable that a possible stone may consist of those substances. These crystals, however, are of little value in proving the presence of a stone.

The important diagnosis of the occlusion of a ureter by a calculus, and at the same time that of the soundness of the opposite kidney, may be made with great certainty if the urine, which has previously been purulent, bloody, or containing renal epithelium or casts, suddenly becomes {45} clear coincidently with the occurrence of symptoms of the impaction of a stone.

It is not of course necessary that in every case of impaction the flow of urine from the affected side should be entirely stopped, since the calculus may be of such a shape as to permit the passage of urine past it.

The PROGNOSIS in this affection is extremely favorable, so far as the recovery from the individual attack is concerned, since if the stone is small enough to enter the ureter it will probably be successful in forcing its way through sooner or later. It is of course possible that this pain, like any other of excessive severity, might cause death, but such an occurrence must be extremely rare.

Perforation of the ureter may occur, with consequent peritonitis. A permanent plugging of the ureter from failure of the calculus to pass will give rise to changes in the kidney to be subsequently described.

In cases where only a single kidney exists, and this becomes obstructed, the symptoms of suppression of the urine may come on, including death by coma if the obstruction is not relieved. Ten days is the limit assigned by Ebstein beyond which recovery is not to be expected, but he mentions a case in which it took place after thirteen days of anuria. It must be remembered that a painful obstruction, or in fact any severe shock to one kidney, may produce a very great diminution in the amount of urine even when the other is sound. This is undoubtedly the result of nervous sympathy.

One attack of renal colic renders another very probable, either immediately or after months or years. Several hundred small calculi may follow each other in rapid succession, or, on the other hand, a single one may leave the patient in peace for a long time. Much depends on the character of the calculus, the diathesis and habits of the patient, and upon the treatment.

The subsequent history of the renal calculus belongs to surgery. After it has reached the bladder and failed to be discharged, it increases in size and is removed by lithotomy or lithotrity. The urethra, however, will usually permit to pass any stone which has come through the ureter. The patient who has just experienced relief from renal colic should be instructed to pass his water into a vessel which can be examined, and if the calculus do not soon make its appearance he should void the urine when stooping forward or even lying on his face, so as to bring the stone to the orifice of the urethra. It may catch in the urethra and demand surgical interference.

The TREATMENT of the paroxysm consists chiefly in relieving the pain, which may be partly done by the hot bath or hot applications. Opium, or preferably morphine subcutaneously, is likely to be called for in large doses. Attention has been called to the danger of morphine in sufficient dose to relieve severe pain in cases where, as in renal colic, the pain is likely to be suddenly terminated by the natural progress of the affection, thus destroying the physiological antagonism which exists between pain and morphine, and allowing the drug to exercise its full power to an extent which may be over-narcotic. The use of atropine with the morphine will mitigate to some extent its danger, without interfering with its analgesic effects.

{46} In the milder cases ether and chloroform may be of value given by the mouth, while in excessively severe ones anæsthetics by inhalation may be called for, and their use continued for hours. This course also is not without its inconveniences. The writer has seen a case where a somewhat prolonged maniacal attack, with delusions lasting several days, came on after the long-continued use of chloroform to relieve the pain incident to the passage of a multitude of small uric-acid calculi.

The use of diluents has been suggested as hastening the passage, but there is no reason to doubt that the pressure upon the calculus is always sufficient to move it forward as rapidly as its shape and size will permit. The relaxation of the spasmodically contracted ureter is of much more importance than an excessive vis-a-tergo applied to the calculus.

The treatment of the incipient calculus in the kidney or of the condition which gives rise to it must naturally vary according to its chemical constitution, which can only be certainly determined after its discharge, but as to which an approximate opinion can be formed from a knowledge of the tendencies and diseases of the patient and from an examination of the urine.

The use of a largely-diluted solution of citrate of lithia or of acetate, citrate, or tartrate of potassium will probably prevent the deposition of uric-acid sand, and might even dissolve a small calculus, although the proofs of this having actually been done are not conclusive. If the urine be largely diluted the risk of the formation of a calculus of another kind--_i.e._ phosphatic--is not great. Simple water would be of great value in many cases, both as dissolving uric acid and as promoting the metamorphosis of tissue, upon some abnormality of which the accumulation of uric acid is supposed to depend. The benzoate of lithia, by the destructive action which Garrod has shown benzoic acid or its derivative hippuric acid to have upon uric acid and the solvent action of the lithia, may be of value. The phosphatic deposit, on the other hand, although beneficially influenced by a sufficient supply of water, is not so amenable to chemical influence as the other form, because it is much easier to render the urine alkaline than acid when any irritation of the urinary passages is present.

The vegetable acids, however, pass into the urine, and may render it acid if in sufficient quantity. Benzoic acid becomes hippuric acid, and can be used to make the urine more acid, as it causes very little gastric irritation even in considerable doses. Boric acid also passes into the urine, and acidifies as well as disinfects it, and might perhaps be used to promote the solution of a phosphatic stone, though the writer is unaware of any instance in which this has actually been done. It does much toward diminishing suppuration in the urinary passages, upon which phosphatic urine largely depends.