Chapter XV: Part 15

Itching of the eyes begins at the inner canthus and generally extends over the greater portion of the conjunctiva, slight at first, but becoming more troublesome as the disease progresses. There is also redness of the conjunctiva, sometimes of the lids alone, at others extending over the whole mucous membrane, and giving to the eyes a bright-red appearance. The lids in severe cases are not infrequently oedematous, lachrymation is greatly increased, and the tears, trickling down the face, are liable to cause excoriation of the skin. Pustules and styes often form on the lids. There is more or less photophobia, according to the severity of the attack.

Owing to the occlusion of the nostrils the patient is often compelled to breathe through the mouth, thus causing an uncomfortable drying of the mucous membrane. There is a peculiar itching of the hard palate, which {221} the patient attempts to relieve by rubbing the roof of the mouth with the point of the tongue. This itching sensation extends over the pharynx, posterior nares, and upward through the Eustachian tubes to the ears, causing a disagreeable irritation, which the patient tries to alleviate by thrusting the tip of the finger into the external meatus. The mucous membrane of the pharynx is red and swollen. The dryness observed early in the attack gives place later to increased secretion, which is sometimes quite abundant. On the anterior surface of the velum of one of my female patients I observed a hard papule about the size of a lentil, which she assured me was always coincident with the attack, and never appeared at any other time.

In addition to headache, which is quite common, patients frequently complain of a heaviness and fulness, also of a peculiar sensation as though the head were constricted by a band. This latter symptom I have found present in about one-half of the cases investigated.

Itching of the skin is quite common, especially of the face, between the shoulder-blades, and over the sternum, and is frequently accompanied by a slight vesicular eruption and occasionally by urticaria.

The whole respiratory tract is in a state of catarrh, but there is very rarely any cough during the first week. This usually commences in the second week, and at that time is short and dry, and becomes every day more frequent until the third week, when it changes its type and becomes paroxysmal. During the first three weeks there is little or no expectoration, and what there is consists of small transparent glutinous masses. About the fourth week the irritation reaches the finer bronchi, and in many cases there is more or less asthma, which, like ordinary bronchial asthma, usually comes on at night. The asthma is sometimes quite severe and long-continued. Wyman states that very few escape cough. This does not accord with the writer's experience, as in 65 of his cases 15 had no cough.

Hay-fever patients suffer greatly from mental depression, complain of lassitude, and their capacity for intellectual labor is diminished. They are often troubled with insomnia, and when such patients do sleep it is in a fitful way, and their rest is often broken by unpleasant dreams.

NOMENCLATURE AND CLASSIFICATION.--The various terms used to designate this disease are all misnomers, and up to the present time none has been devised which conveys any idea of the true character of the disease. Hay fever is incorrect, because hay is only a cause in a limited number of cases, and fever is by no means a prominent symptom. Hay asthma should be discarded, for asthma is far from being a constant accompaniment of the affection. Autumnal catarrh or early spring catarrh only serves to designate the time at which the two forms usually appear, but conveys no idea of the disease in its entirety; while the term pollen catarrh or pollen fever is objectionable on the ground that, although the disease is most frequently produced by that agent, there are causes other than pollen which may excite it.

Hay fever is variously classified by different authors, some, like Thorowgood and Beard, regarding it as a neurosis, while others (Bostock, Phoebus, and Wyman) appear to regard catarrh as its distinguishing feature. Zuelzer has recently classed it among the acute infectious diseases, but assigns no reason for placing it in that group.

DIAGNOSIS.--To any one at all familiar with the symptoms of the disease the diagnosis of hay fever is quite easy. Its distinctive features are: It appears at the same time every year (the early form about the 1st of June and the later about the 20th of August); the severity of the local symptoms which usher in the disease--sneezing, stoppage of the nostrils, the inflamed condition of the eyes, and above all the itching of the nose, eyes, skin, and mucous membrane of the root of the mouth. A detailed differential diagnosis {222} is not as important now as it was formerly, when, as in the days of one of its early describers, Phoebus, "Man sah sie nicht, wo sie war, und sie sah, wo sie nicht war."

PROGNOSIS.--The number of elderly persons with hay fever, many of whom have passed the allotted threescore years and ten, and the fact that no one has ever been known to die from the disease, affords conclusive evidence that it does not shorten life. On the other hand, when once affected, except in those cases relieved by operative procedure, the patient remains subject to it during the remainder of his life. A few isolated cases are said to have recovered, but such a result is extremely rare. It is thought by some that a prolonged residence in the South may mitigate the disease, and eventually cure it, but this assertion lacks confirmation. It does not, like bronchial asthma, lead to secondary affections, the interval between the attacks giving the organs time to recuperate, nor does it predispose to other diseases.

TREATMENT.--Aside from its surgical treatment, to which I shall refer farther on, the only effectual remedy for hay fever consists in removal to a region which is exempt from the disease. By going to such a locality before the attack occurs, and remaining there throughout the critical period, complete immunity from the disease may be secured. The time of departure and return must be determined by the previous experience of the invalid in regard to the date upon which his former attacks have commenced. As the disease seldom comes on exactly on the same day every year, but often varies three or four days, he should be in his place of refuge at least a week before the usual time for the attack, and should remain until he can return with perfect safety. This is usually about the middle of July in the early variety, and after the first frost severe enough to kill vegetation in the autumnal form.

In the milder form which occurs in the spring the seashore affords considerable relief, except when the wind is from the land. It is therefore uncertain, and is only indicated when the circumstances of the patient prevent his visiting one of the exempt localities. On the eastern coast of the United States there are several places of this character, such as the Isles of Shoals, a group of rocky islands with little or no vegetation off the coast of New Hampshire, the climate of which is very like that of the ocean; and Fire Island, near New York. Similar to the above, but much more exposed to land influences, are Mount Desert and Nantucket.

The ocean itself affords complete exemption, and a sea-voyage is the surest means of avoiding the disease. It is true that persons have been known to be affected with hay fever even in mid-ocean, but in such cases it is more than probable that the cause of the attack could have been traced to the cargo. A case of this character came under the writer's observation during a voyage from New York to Charleston during the month of September, and was evidently caused by hay, a number of bales of which were stowed on the forward deck of the vessel. It makes comparatively little difference what particular voyage is undertaken, provided the vessel's course does not bring her too near land; but for most hay-fever patients a trip to Europe is to be preferred, especially for those suffering with the autumnal form, as by going to that country, where this variety does not exist, they avoid the necessity of remaining nearly two months on the water. A voyage to California is almost as good, and for the same reasons.

Whether this applies to the so-called June or rose cold, which is quite common in Great Britain and prevails to some extent on the Continent, has not as yet been definitely determined, but it is more than probable. Whether patients who have contracted the disease in Europe would escape in America is exceedingly doubtful. Two of the cases reported to the writer, who were first attacked (with the early form) in Europe--the one in Switzerland and the other at Florence--continued to have the disease after their return to {223} this country; while, on the other hand, an English lady who was subject to the disease at home escaped entirely during her residence of three years in the Southern States. Of the exempt regions in the United States, the one most frequently resorted to, and which at the same time affords the surest relief, is that of the White Mountains of New Hampshire--not the whole of it, but a certain portion, which is bounded on the west by a line drawn from Littleton to Lancaster (but not including the former place, which is only partially exempt), on the north by Canada, on the south by Franconia, Crawford House, and Jackson, while to the east it extends as far as Bethel in Maine. Of the various places contained within this territory, Bethlehem and Jefferson, Whitefield, White Mountain House, Fabian's, Twin Mountain House, Crawford House, Glen, Gorham, and Mount Washington, may be regarded as entirely exempt; Franconia Notch almost equally so; while Dalton, Lancaster, and Bethel must be ranked as uncertain. Another exempt region extends to the north and east of the one just described, and comprises the lake region of Maine. Petoskey in Northern Michigan, at the head of Little Traverse Bay, is said to afford almost entire relief, and is resorted to by a large number of patients from the Western and South-western States. There are also several places in Vermont which offer more or less immunity, such as Mounts Mansfield and Stow, both of which, however, are inferior to those first mentioned. Canada, with the exception of a few cases reported at Toronto, St. Catherine's, and at a few places near its southern border, appears to be exempt. The same may be said of the Adirondack Mountains and Pottersville on Schroon Lake and Marquette. The Catskill Mountains and several places high up on the Alleghanies, such as Cresson, Pa., Oakland and Deer Park in Maryland, afford relief in many cases. Colorado is said to be exempt, but several patients who have gone there failed to obtain relief. California is free from the disease, and many hay-fever patients have escaped their attacks by removal to that State. I know of no place in the Southern States which affords relief except Florida, where the disease is rare; several cases have been entirely relieved during their residence there. In others, however, the experiment was unsuccessful.[17]

[Footnote 17: Two patients in their replies to the writer's circular claimed to have been entirely exempt--the one (early form) at Beaufort, and the other (autumnal) at Mount Airy, Habersham county, Ga. Wyman mentions four cases that were relieved at or near Beaufort.]

The relief obtained by resorting to an exempt locality after the attack has begun is very prompt, all symptoms of the disease disappearing within a few days after the arrival of the patient. While residing at Bethlehem, N.H., I was called one evening to see a German who had just arrived on the train from Fall River. His condition was most pitiable: his eyes were fiery red, the nose and face were terribly swollen, while the water streamed from both eyes and nose. The asthma was at its height, and his struggles for breath were fearful in the extreme. A quarter of a grain of morphia was injected into the arm, and after providing other means for his comfort I left him for the night. The next morning, while preparing to pay him an early visit, the patient himself appeared at my office, bright and cheerful, and so much changed that I at first failed to recognize him. A single night had served to dissipate all traces of his hay fever.

Unfortunately, a journey to the mountains, and a residence there of six or eight weeks, are not within the reach of every one afflicted with the disease; and for these unfortunates something must be done to relieve, or at least mitigate, their sufferings. If unable to visit any of the exempt localities, a sufferer may secure a certain degree of comfort by exposing himself as little as possible to the exciting causes of hay fever. As it is well known that heat and dust aggravate the symptoms, the windows of the apartment occupied {224} by the patient should be so arranged as to exclude the sunlight and every precaution taken to avoid the presence of dust. He should eat good, nutritious food, avoiding the use of all stimulants, except perhaps a little light wine at dinner. Anything which induces dyspepsia must be carefully guarded against, and care taken to keep the bowels regular.

Blackley[18] advises as a surer method of excluding the irritant (pollen) the hanging of a curtain of thin calico before the door and fitting into the lower portion of one of the windows a screen made of two layers of thin black muslin enclosed in a square frame. When in use both curtain and screen should be moistened with a solution of carbolic acid, ten grains of the acid to one pint of water. For those who are compelled to go out he has devised a very ingenious respirator. Having taken an exact cast of the nasal passages from the margins of the alæ and septum to the inferior turbinated bones, he constructed with the aid of these, by means of the galvano-plastic process, cases of silver fitting exactly all the folds and depressions of the cavity. Several layers of platinum wire, 0.001" to 0.007", were arranged in the cases. The sieve thus formed was moistened before using with a 1/10 per cent. solution of carbolic acid. To prevent the pollen from coming in contact with the eyes, they were protected with spectacles provided with accurately-fitting gauze guards. The result of wearing this apparatus was an almost perfect freedom from unpleasant symptoms.

[Footnote 18: _Op. cit._, p. 267.]

In the absence of any specific, the medicinal treatment of hay fever is necessarily confined to palliative measures. Debility being one of the prominent symptoms, tonics are indicated, and in this way quinine, at times regarded almost as a specific, may be of use. It should be given in doses of one or two grains three times a day before and during the attack. Thus administered, it is undoubtedly of great utility in many cases. Arsenic, whether in the form of Fowler's solution or the iodide of arsenic, as suggested by Blackley, may also be used with advantage. Galvanism, which was used successfully by Hutchinson of Rhode Island, is strongly recommended by the late Beard. He advises that the negative pole be placed at the epigastrium "and the positive applied a moment over the forehead and on top of the moistened head, then over the front and back of the neck, and down the upper and middle of the spine." The current used should be mild and the sittings short. The writer has had no personal experience with this method of treatment, nor has it been generally adopted.

The injection into the nostrils of a saturated solution of quinine by Helmholtz, although apparently useful in his case, has not met with like success in the hands of others.

The troublesome itching and burning of the eyes and face are most readily relieved by bathing the parts at first in tepid and then in cold water, repeated several times a day, and with mild astringent collyria, such as a strong infusion of tea or of one or two grains of sulphate of zinc to an ounce of rosewater. If the lids be much inflamed and the skin excoriated, the following ointment may be applied:

Rx. Bismuth. subnit. drachm ss;
Ungt. simpl. ounce j.
M. Ft. ungt.

The pharyngeal symptoms are best controlled by chlorate of potassium as a gargle, or, better still, in the form of the compressed tablets now prepared by many of our druggists. The treatment of the asthmatic symptoms differs in no way from that which we have recommended for the paroxysms of BRONCHIAL ASTHMA, the details of which were fully described in the preceding article.

In 1880, Harrison Allen of Philadelphia published an article[19] directing {225} the attention of the profession to the fact that many cases of chronic nasal catarrh which had resisted the ordinary methods of treatment could be readily cured by restoring the permeability of the nasal passages.

[Footnote 19: _Am. Journal of Med. Sciences_, January, 1880, Philadelphia.]

In April, 1882, William H. Daly of Pittsburgh, Pa., in a paper[20] read before the American Laryngological Association, gave the histories of three cases of hay fever which he had succeeded in curing by means of operative procedure. In each of these cases the tissue over the inferior and middle turbinated bones was hypertrophied, and in one case it was so extremely sensitive that the slightest touch with the probe was sufficient to excite a violent paroxysm of sneezing. In these the diseased tissue was removed with the galvano-cautery or by the application of glacial acetic acid.

[Footnote 20: "On the Relation of Hay Asthma and Chronic Naso-pharyngeal Catarrh," _Archives of Laryngology_, vol. iii. No. 2.]

The following year (1883) a much more elaborate article[21] on the same subject was published by John O. Roe of Rochester, N.Y. After describing the highly vascular and somewhat erectile tissue covering the inferior turbinated bones and lower portion of the septum, the turbinated corpora cavernosa of Bigelow, he calls attention to its great susceptibility to the action of irritants, whether applied locally or to some remote portion of the body, citing as an example of the latter the swelling, and sometimes almost complete closure, of the nostrils supervening after exposure of the body to the action of a current of cold air. In this situation the tissue is liable to become hypertrophied, and in that state its susceptibility is greatly increased. If, when in this condition, it is exposed to the action of pollen, dust, or any other irritant, the substance produces a local irritation which is reflected through the sympathetic nerves to other parts of the respiratory tract; and it is to this reflected irritation that Roe attributes most of the phenomena of hay fever. He regards it as analogous to certain forms of laryngeal catarrh which, according to the recent testimony of many distinguished laryngologists, are clearly traceable to disease of the nasal cavity. Applying this theory to the treatment of hay fever, he removed the hypertrophied tissue in five cases, and in every instance succeeded in preventing a recurrence of all symptoms of the disease. His operation consists in the removal of the diseased tissue by means of Jarvis's wire écraseur and the galvano-cautery, caustics having proved less effective. The wire snare is best adapted for the removal of the tissue over the posterior portion of the turbinated bone, where, owing to its being pedunculated, it is readily caught in the wire loop. Over the anterior portion of the turbinated bone, as well as over the septum, the growth is more sessile, and is best destroyed by means of the galvano-cautery. To avoid inflammatory reaction and to guard against other unpleasant symptoms it is advisable to remove only a small portion of the growth at a time. After each operation the part should be sprayed with warmed vaseline to allay the irritation occasioned by the burning, and this should be continued until the surface is sufficiently healed over to admit of a repetition of the operation. The cauterization should be repeated until every trace of the diseased tissue is removed.

[Footnote 21: _The Pathology and Radical Cure of Hay Fever_, New York, 1883.]

Prior to the publication of Roe's article Harrison Allen had operated successfully on two cases, the histories of which he has not as yet published, but has kindly communicated by letter to the writer, together with a description of his method of operating. This latter differs but little from that of Roe, except as regards the time at which the operation should be performed, Roe maintaining that the operation should never be performed when the patient is suffering from an attack of hay fever, while Allen considers this immaterial, and does not hesitate to operate even when the symptoms are at their height. If symptoms of hay fever recur after the operation, the nares should be {226} carefully examined, and if, as is usual in such cases, any remnants of hypertrophied tissue be discovered, these should be at once removed. The operation is not regarded as a very painful one, and a patient of Allen's upon whom he had operated during an attack assures me that he left the doctor's office feeling much better than when he entered it. This is mentioned because hay-fever patients are excessively nervous, and timidity on their part has hitherto prevented many of them from availing themselves of this form of treatment.

It will be seen that, thus far, the operation has been performed in but ten cases, but the results have been so uniformly successful as to justify the belief that it is capable of relieving many cases of this hitherto intractable disease. Whether this hypertrophied condition is present in every case, as claimed by many, or in even the majority of cases of hay fever, has not as yet been determined; and until further observation shall have decided this question it will be impossible to form an opinion in regard to the general application of this method of treatment.

{227}

DILATATION OF THE BRONCHIAL TUBES, CIRCUMSCRIBED AND DIFFUSED.

BY SAMUEL C. CHEW, M.D.

DEFINITION.--Enlargement of the calibre of a bronchial tube or tubes, whether confined to a limited portion of one tube, or reaching throughout a great part of its extent, or involving several or many tubes.

SYNONYM.--Bronchiectasis, from [Greek: bronchos], a bronchial tube, and [Greek: echtasis], an expansion.

HISTORY.--The change in the physical condition and size of a bronchial tube, designated as bronchial dilatation, never occurs as a primary affection, but is always the result of some preceding disease, especially of chronic bronchitis or fibroid phthisis. The full consideration of its pathological origin belongs, therefore, to the natural history of those causative affections.

Later writers have in general followed Laennec's description of the different varieties of bronchial dilatation; which, indeed, can hardly be improved upon, for such was the accuracy of that great clinician and pathologist as an observer that nothing was likely to escape him as regards physical conditions, though he may sometimes have been in error as to the theoretical explanation of what he saw. Previously to Laennec's observations dilatation of the bronchial tubes was, as he remarked himself, almost entirely overlooked both by pathologists and practitioners. The reason of this is evident from the considerations that a smaller tube when dilated would, except to the most careful examination, closely resemble a larger tube of normal size, and that a large dilatation might be mistaken by the ear at the bedside and by the eye at the necropsy for a pulmonary vomica.

Two principal forms of bronchial dilatation are met with. In the first, or diffused bronchial dilatation, known also as the cylindrical form, the tube is uniformly enlarged in calibre, so that, whereas in the normal state it would have admitted only a fine probe, in its enlarged condition it may be of the size of a goosequill. In this state it may be readily mistaken, when seen by itself, for a larger tube; but the alteration is conspicuous when the tube is seen to be larger than the branch from which it is given off. In the second or circumscribed form, which is also termed sacculated dilatation, a pouch-like or fusiform distension occurs in the continuity of a tube. In a third form, which is far less common, several successive enlargements are met with in the course of one tube, which thus presents a beaded appearance. It happens at times that all of these different varieties of dilatation may be encountered in the bronchial tubes of the same lung. The second, or sacculated, form is the most common, especially in young persons.

ETIOLOGY.--In both of the more common forms of bronchial dilatation the previous existence of bronchitis is to be regarded as the chief causative agency, though other conditions may serve to increase the dilatation when it has once been established. Laennec's observations led him to connect the {228} occurrence of bronchitis with the production of dilatation of the bronchial tubes, though his explanation of the mechanism of this production was erroneous, inasmuch as he considered the accumulation of secretion in the affected tubes, and the forcible inspiratory efforts made in coughing to dislodge this accumulation, to be the direct causes of the enlargement. The part played by bronchitis in producing dilatation is, however, less immediate and mechanical than Laennec held it to be. It may, in a general way, be considered the direct cause of the cylindrical and the indirect cause of the saccular form of dilatation.

The long continuance of chronic bronchitis gives rise to weakness and atony of the bronchial walls, so that they yield to the pressure brought to bear upon them in the violent or protracted and repeated respiratory efforts that are made in coughing. In such cases the tubes which are themselves affected by the inflammatory process may yield throughout a greater or less extent of their continuity, and thus the cylindrical form of dilatation may be established. The same mechanism may be supposed to give rise to the beaded variety of the disease if the inflammatory action should be greater at several points along the course of a tube, with intervals of tissue in a healthier or less atonic state.

In the saccular form, on the other hand, the dilatation does not occur in the portion of the tube which is chiefly affected with the inflammatory process, but is the consequence of a local capillary bronchitis involving the ultimate ramifications of the affected tube and occasioning collapse of a portion of the lung. This collapse operates in two ways in causing a pouch-like dilatation of an adjacent bronchus--partly through the atmospheric pressure within the affected tube, tending to fill the space created by the collapsed portion, and partly by the traction of this collapsed lung-tissue outside of the tube.

In addition to the part played by bronchitis and atelectasis of the lung in occasioning bronchial dilatation, another important factor in its production is to be found in the condition described by Corrigan in 1838 as cirrhosis of the lung, and since recognized as interstitial pneumonia or fibroid phthisis. In this affection there is formed around the blood-vessels and terminal bronchi, as well as around the air-vesicles, a hyperplasia of the connective tissue, which, as is the case with connective-tissue formations in other situations, ultimately contracts, obliterating the air-cells, smaller bronchi, and blood-vessels, and thus converts the lung-tissue into a tough, fibrous mass. By the contraction thus produced the bronchial tubes of a larger size, which have been previously weakened by bronchitis and have lost their elasticity, are subjected to traction on all sides, and thus become dilated. Dilatations of all forms may thus be produced, cylindrical, sacculated, or beaded, according to the amount of lung involved in the contracting process and to the degree and situation of the bronchitis which favors the dilating action.

The determining causes, then, of bronchial dilatation are--1st, chronic bronchitis; 2d, atelectasis; and, 3d, fibroid phthisis or cirrhosis of the lung.

SYMPTOMATOLOGY.--The general symptoms of bronchial dilatation, as well as the course and duration of the affection, are such as belong to the pulmonary diseases favoring its production, especially chronic bronchitis and fibroid phthisis. The cough and dyspnoea of these diseases are aggravated by bronchial dilatation; but these symptoms, together with the impairment of nutrition, are due rather to the underlying affections than to the mere fact of dilatation. Increased and fetid expectoration, which often occurs in bronchial dilatation from retained and altered secretion, is by no means characteristic of this condition, since it may occur where no sign of dilatation exists.

There is generally some degree of dulness on percussion over a dilated {229} bronchial tube, due to the condensation of the lung-tissue surrounding it, and varying in extent and degree with the amount of that condensation, and also with the amount of secretion retained within the tube. Sometimes, however, increased resonance of a tympanitic character is observed, especially if the dilatation be of the saccular form and near the surface of the lung. Such differences in the percussion sound are analogous to what occurs over a pulmonary vomica, which will generally give a dull sound, though, if the cavity be superficial and thin-walled, it may yield a tympanitic resonance. On auscultation bronchial respiration may be heard along the course of tubes affected with cylindrical dilatation when they are free from secretion; and this is more intense in proportion as the tube is more dilated and the lung-tissue around it more condensed. Bronchophony and increased vocal resonance also occur, and if mucus be present in the dilated tubes coarse moist râles will be heard. In a saccular dilatation there may be true amphoric breathing, with the gurgling sounds heard in a vomica. In some cases there is an alteration in the appearance of the chest-wall, which is retracted by the shrinking of the condensed lung beneath.

Now, of the auscultatory signs that have been mentioned, the bronchophony and increased vocal resonance, together with the percussion dulness, belong also to pneumonia, which, however, at least in its acute form, can be distinguished from bronchial dilatation by the previous history, the febrile movement, and the general phenomena of the case, and by the fact that the tubal breathing of pneumonia, besides being less persistent, is most frequently met with in the lower part of the lung, and that of bronchial dilatation in the upper part.

But the diagnosis between a dilated bronchus and pulmonary phthisis is in some cases a very difficult problem, the signs of the cylindrical form closely simulating those of the stage of deposit in phthisis, because involving the same physical condition, and those of the saccular variety corresponding often with the auscultatory signs of a cavity. In the former case there may be the same localized dulness on percussion, the same bronchial or broncho-vesicular breathing, and the same sinking or contraction of the chest-wall apparent on inspection. In the latter case there may be equally in saccular dilatation and in a vomica amphoric breathing, gurgling, and pectoriloquy. In the establishment of the diagnosis between these two conditions Austin Flint, Sr.,[1] justly attaches importance to the circumstance that there is in general a greater degree of percussion dulness over a cavity than over a dilated bronchus, so that a relatively greater prominence of the auscultatory signs as compared with the degree of dulness makes the diagnosis of dilatation more probable. But the most important evidence on the point is to be gotten from the history of the case. If in a case where the auscultatory signs would leave the examiner in doubt there were found loss of flesh, fever, night-sweats, quickened pulse, and the other general phenomena belonging to phthisis, the existence of this affection would be rendered probable in the highest degree, and the auscultatory signs should be taken as corroborating an opinion founded on the general symptoms.

[Footnote 1: _Dis. of Resp. Organs_, p. 353.]

Positive evidence, again, may be furnished by a microscopic examination of the sputa; the discovery of particles of lung-tissue or the so-called bacillus tuberculosis pointing clearly to phthisis. Conversely, the absence of the general symptoms of phthisis would, in a case presenting the above auscultatory signs, render it probable that they are due to bronchial dilatation. Long-continued cough and abundant expectoration are the chief symptoms common in both forms of disease. There are, however, some cases in which even with the most careful examination and weighing of evidence the physician will be left in doubt, inasmuch as in some cases of otherwise {230} well-marked phthisis the usual constitutional symptoms are absent or imperfectly declared. In such exceptional cases the estimate of probabilities is to be based on the fact that while bronchial dilatation is comparatively rare, pulmonary phthisis is extremely common.

PATHOLOGY AND MORBID ANATOMY.--Enlargement of the bronchi may be met with throughout almost the entire extent of a lung; when limited to a part of the organ the change most frequently occurs, according to Laennec, Rokitansky, and other observers, in the superior lobe and toward the anterior border. The tubes of the third or fourth order in respect to size are most frequently affected, the primary bronchi being never involved except in association with tracheal dilatation.

In the different forms of dilatation the bronchial walls are found in various states. In the cylindrical variety they are for the most part thickened and hypertrophied, both as to the mucous and the fibrous coats; the mucous membrane being in a catarrhal state, covered often with muco-purulent discharge, and easily broken down and detached, while underneath the white fibrous coat is sensibly thickened.

In the sacculated form, on the other hand, the bronchial wall generally presents a thin and atrophied appearance, the mucous membrane undergoing but little change, except that the stretching to which it has been subjected gives it a smooth and shining look. This difference in the degree of thickening of the bronchial walls in the two forms of dilatation is in part due to the fact that in the saccular variety the enlargement in calibre is far greater than it is in the cylindrical form for a corresponding extent of a tube, so that its wall is much more stretched and attenuated, and thus the tendency to hypertrophy which has play in the cylindrical form is more than overcome in the saccular. But the chief reason of the difference in the state of the walls in the two forms of dilatation is found in the different modes in which they are respectively brought about, as already described.

DIAGNOSIS.--It has been shown that the determination of the existence of bronchial dilatation is at times one of the most difficult problems in diagnosis, from the fact that the auscultatory signs belonging to it may be equally met with in other affections, especially in pulmonary phthisis. The diagnosis is to be established, when this is possible, only by a careful consideration of the physical signs in connection with the general symptoms, so that the sources of doubt arising from the one set of phenomena may be as far as possible corrected by the other. These signs and symptoms, and the various affections to be discriminated by them, have been sufficiently set forth under the head of Symptomatology. While in this way a clear conclusion may be reached in many cases, yet there are others in which, notwithstanding the utmost care, there may still be a doubt as to whether the symptoms and signs indicate a dilated tube or a pulmonary cavity.

PROGNOSIS.--The prognosis of bronchial dilatation is directly connected with that of the affections which chiefly give rise to it--viz. chronic bronchitis and fibroid phthisis. When chronic bronchitis has lasted long enough to cause dilatation, it is seldom if ever cured, and, though improvement may take place from time to time in its symptoms, yet the dilated bronchi can hardly undergo diminution in their size. And in fibroid phthisis, while the progress of the disease is often very slow, yet it is on a downward grade, and the connective-tissue contraction giving rise to the dilatation increases with the advance of the malady.

TREATMENT.--The treatment of cases of bronchial dilatation resolves itself in great degree into that of the underlying and causal diseases on which it depends. As regards methods specially directed to the areas of dilatation, they consist of alterative, astringent, stimulant, and antiseptic remedies, either administered by the stomach or used by the process of inhalation. Cough {231} may be allayed with the syrup of lettuce containing in each dose from one-eighth to one-fourth of a grain of sulphate of codeia or 10 or 12 drops of the spirit of chloroform. If expectoration is very profuse, sulphate of atropia, in the dose of one-hundredth to one-eightieth of a grain, or the extract or tincture of belladonna, may be used. Turpentine and eucalyptol have a controlling influence over this symptom, and are specially beneficial if the bronchial secretion is fetid. They may be given by the mouth in the dose of minim v-xx in emulsion, and applied also by inhalation of their vapor or by spray. Inhalations of solutions of carbolic acid, minim j-x to an ounce of water, are more effective than anything else in checking fetor of the expectoration and the breath. This agent may also be administered by the mouth in the dose of fluidrachm j-iv of a 1 per cent. solution.

{232}

EMPHYSEMA.

BY SAMUEL C. CHEW, M.D.

DEFINITION.--The term emphysema is derived from [Greek: emphysaô], to inflate, and signifies an increased amount of air in a part or the whole of one or both lungs. Accordingly as the situation of this excess of air is _(a)_ in the air-vesicles or _(b)_ in the connective tissue between the lobules, emphysema is divided into Vesicular emphysema and Interlobular or extra-vesicular emphysema.

HISTORY.--These two affections are different pathologically and anatomically, vesicular emphysema being a much more common and important affection than the interlobular form. The distinction between the two forms was first drawn by Laennec. Previously to his time the essential difference between them was unknown; and, as the accurate diagnosis of the disease can be made only by auscultation, its existence was no doubt very often entirely overlooked. It has been remarked by Rokitansky[1] that "had Laennec done nothing else for medical science, his discovery of this diseased condition, and of the causes giving rise to it, would have sufficed to render his name immortal."

[Footnote 1: _Path. Anat._, vol. iv. p. 53, Am. ed.]

VESICULAR EMPHYSEMA.

Vesicular emphysema may be defined as an absolute or relative increase in the amount of air contained in the vesicles of a part or the whole of one or both lungs. As a substantive disease it occurs in two principal forms--hypertrophic and atrophic; but besides these it is met with as a secondary affection due to other diseases and limited to certain areas of the lungs, sometimes acute and sometimes chronic in its production and duration. It will therefore be best to consider the disease under the following different forms:

1st. Acute lobular emphysema;
2d. Chronic lobular emphysema;
3d. Hypertrophic lobar emphysema;
4th. Atrophic lobar emphysema.

1. Acute Lobular Emphysema.

This form of the disease is the result of the rapid distension beyond their natural size of air-vesicles which had previously been healthy. It is most frequently met with in children and as the consequence of bronchitis or {233} whooping cough. The paroxysms of cough occurring in these affections, especially in the latter, are attended by deep inspirations, by which the vesicles are directly distended, and by violent expiratory efforts, with closure of the glottis, so that the air is forced into those portions of the lungs where there is least resistance, particularly at the apex and along the margins. In a large proportion of cases of acute lobular emphysema, when the distending cause is removed by the cessation of the cough, the vesicles return to their normal size through their natural elasticity, which has not been destroyed. But in some cases, when the cough has been of unusual violence or of very long duration, the change may be permanent through loss of this elasticity, and thus a form of chronic lobular emphysema is produced.

SYMPTOMS AND SIGNS.--Unless emphysema of this form is extensive and extreme in degree, it is not attended with symptoms additional to those of the affections giving rise to it. When very great it may occasion increased percussion resonance.

TREATMENT.--The treatment is only what is required by the causal affections.

2. Chronic Lobular Emphysema.

In many cases emphysema is confined to a limited number of lobules, especially at the apices, the anterior borders, or about the base of the lung; and being gradual in development and permanent in duration, it is then termed chronic lobular emphysema. This is the form frequently met with in the different varieties of pulmonary phthisis, in which its development seems supplementary to the incapacitation of other portions of the lung. The lobules nearest to the surface of the lung or immediately beneath the pleura are found to be most distended, so that they often project beyond the adjacent surface.

Chronic lobular emphysema is chiefly of interest in connection with the other pulmonary diseases which give rise to it. The mechanism of its production is like that of acute lobular emphysema, but the diseases occasioning it being chronic the emphysema to which they give rise is equally permanent. At the apex of the lung, its most common situation, it is very often associated with tubercle in a calcareous state. The changes accompanying this deposit of tubercle favor the loss of elasticity in the vesicles of the apex, and the violent expiratory efforts, with closure of the glottis, occurring in the attacks of cough to which phthisical patients are subject, force the air into this part especially, and also into other regions of less resistance, and thus occasion permanent distension of the vesicles.

SYMPTOMS AND SIGNS.--The signs of this form of emphysema are so often masked by those proper to phthisis that the detection of the former is difficult or impossible. This, however, is of no practical importance in respect to treatment. At times the distension of the vesicles at the apex is so great as to produce bulging in the supra-clavicular region and to overcome the dulness due to deposit by the resonance it occasions.

TREATMENT.--No special treatment beyond that of the causative affections is required.

3. Hypertrophic Lobar Emphysema.

This is a substantive affection, and is much the most important form of the disease, both in its origin and development and in the consequences to which it leads. Though sometimes limited to one lung, or even to a single lobe of {234} one lung, yet it more commonly involves the greater part of both lungs, which are increased in size, as shown by the alteration of the contour of the chest during life and by the appearance of the organs after death. This enlargement of a lobe or of a whole lung is of course the aggregate of the increase in size of the individual vesicles, the changes in which form the pathological units of the disease.

ETIOLOGY.--In no disease is the study of etiology as throwing light on treatment, both medicinal and hygienic, of more value than in emphysema, the important question being as to whether it takes its origin from some immediate mechanical cause acting upon the healthy cell-walls, and thus distending them, or whether they suffer such distension only when they have been previously weakened by some degenerative process in their tissue. The importance of determining this point correctly with reference to treatment is obvious.

In partial and lobular emphysema the change may have been wrought by causes mechanical in their nature and directed specially to the affected parts, such as have been already referred to; but in the general diffused or lobar form of the disease, in which by degrees the greater part or the whole of a lung is involved, we are almost compelled to assume the existence of some degenerative process or tendency coextensive with the malady and determining its existence. That any one form of degeneration is present in all cases has never been proved; indeed, it may be said to have been disproved. Rainey's view, that the change in the air-cells is essentially dependent on fatty degeneration of their walls, was based mainly on observations made upon a single case, and, although favored by the eminent authority of C. J. B. Williams, it has not been substantiated. The same thing must be said of Sir William Jenner's teaching, that fibroid degeneration is the essential lesion. Though both fibroid and fatty changes are found in not a few cases, yet in others a careful examination has failed to detect either the one or the other of them, so that neither can be regarded as the essential condition explaining all cases. Nevertheless, it is probable in the highest degree that a degenerative change of some kind, due to imperfect or perverted nutrition of the cell-walls, always exists in general lobar emphysema, though its nature may sometimes elude observation.

In cases of well-marked emphysema there may be no discoverable morphological changes in the walls of the alveoli, though, as remarked by Hertz,[2] "a tissue-relaxation may be present in the lung without our being able to recognize any corresponding microscopic abnormality."

[Footnote 2: _Ziemssen's Cyclop._, vol. v. p. 373.]

It may be said, then, that while in partial or local emphysema the alteration in the air-vesicles may be effected by extraordinary efforts brought to bear upon healthy cell-walls, in general or lobar emphysema, on the other hand, it may be produced by ordinary efforts acting upon weakened and diseased cell-walls. The morbid change is probably not in all cases alike, being sometimes fatty, sometimes fibroid, degeneration, and in other cases of a kind not ascertained.

In addition to other considerations, the markedly hereditary nature of emphysema in not a few instances would of itself render the existence of some constitutional predisposing cause highly probable. On this point A. T. H. Waters[3] quotes the observations of Greenhow and Jackson. Out of 42 cases collected by Greenhow, 23 showed an hereditary tendency, and in 28 reported by Jackson, 18 were of emphysematous parentage. In stating his belief that substantive or general emphysema is the result of some degenerative process, Waters bases it on the following considerations: 1st. The high degree of development which the disease often reaches, without any {235} previous history of violent or long-standing cough, in connection with either bronchitis, whooping cough, or any similar affection. 2d. The frequency with which the disease attacks the whole of both lungs, and the uniform character of the morbid changes often observed throughout all parts of the lungs. 3d. The hereditary nature of the disease, as shown by observations. 4th. The manner in which the disease is influenced by certain remedial measures which are known to act beneficially on other diseases attended with degeneration of tissue.

[Footnote 3: _Diseases of the Chest_, pp. 122, 123.]

As to the nature of the immediate exciting cause of emphysema, whether in the general or local form, different views have been maintained. The most important of these are the inspiratory and expiratory theories.

The former of these theories, that in accordance with which the disease is referred to inspiratory action, was maintained by Laennec, and under the influence of his authority was at one time generally accepted. In accordance with this view, the existence of bronchitis is an important factor in the production of emphysema, as undoubtedly it often is in the lobular form. The dilatation of the air-vesicles was attributed to their over-distension by inspiratory efforts allowing the free entrance of air, the escape of which was impeded by bronchial mucus. Inspiration was thus regarded as a more powerful act than expiration, which was considered too feeble to drive the air beyond the accumulated mucus. In this way the air was supposed to accumulate in gradually increasing amount within the cells, which thus became distended.

But in opposition to this view it has been shown by Hutchinson's researches that Laennec was wrong in supposing inspiratory power to be greater than that of expiration; and it is further opposed by the researches of Mendelssohn and Traube, and those of Gairdner, which have shown conclusively that the presence of a pledget of mucus in a bronchial tube, so far from causing distension of the air-vesicles to which it leads, must ultimately ensure their collapse. The collapse thus occasioned, which is most common in the lower parts of the lungs, may lead, partly perhaps through inspiratory pressure, to vicarious emphysema in the upper portions, which receive a relatively larger quantity of air, in accordance with Williams' theory of negative inspiratory pressure.

It is true, then, as maintained by Laennec, that bronchitis may occasion emphysema, but the emphysema does not occur in the vesicles to which the affected tubes directly lead, nor from the force of inspiration applied to these vesicles, as Laennec taught, but in other portions of the lungs.

The expiratory theory affords a more satisfactory explanation of emphysema than does the inspiratory theory, and one more completely in accordance with the physiology of respiration and the anatomy of the thorax.

In ordinary expiration, in which the lungs are uniformly and equably compressed by the chest-walls, there is nothing tending to force air into one part of these organs more than into another, and thus produce emphysematous dilatation. But in forced expiration, such as occurs in the act of coughing, it may be plainly seen, if the chest be uncovered, that the air is driven upward to the top of the lungs, so as to produce a perceptible bulging in the supra-clavicular region. This bulging is notably increased in the coughing-spells of emphysematous subjects; and this fact is urged by Sir William Jenner both as throwing light upon the expiratory act as a principal factor in the disease, and as accounting for the special frequency of emphysema in the upper parts of the lungs. The explanation of this phenomenon is found in the circumstance that in the strong expiratory efforts of coughing the abdominal muscles force the diaphragm upward, and thus compress the lungs from below; at the same time the strong lateral anterior and posterior thoracic walls resist pressure, while the superior part of the thorax, covered over {236} with fascia, but not completely protected by a bony structure, offers least resistance. To this unprotected part of the lungs and to the free margins and borders, which contain normally the smallest amount of air, will the strong currents produced by violent expiratory efforts be driven, so as to cause distension of their vesicles. Thus, the frequent coughing-spells of bronchial catarrh, so commonly associated with emphysema, give rise to the expiratory efforts which are the immediate cause of the emphysema.

While, therefore, it is probable that in some cases and to a certain degree inspiration may have a share in occasioning emphysema, yet expiration is to be regarded as a more important and more frequent factor in its production. This, at least, is probably the case in partial and lobular emphysema, and in some instances of the lobar form where the disease gradually spreads throughout a lobe. But in rapidly-diffused and extensive lobar emphysema such an explanation cannot always be admitted, because sometimes the disease advances steadily, so as to involve the greater part of one or both lungs without the occurrence of any paroxysms of cough which could distend the air-cells by their violent expiratory efforts. In such cases the only distending force would seem to be that of ordinary inspiration, which, while it might have no effect upon healthy lung-tissue, may easily be supposed to exercise sufficient dilating power upon air-cells, the walls of which are in a state of degeneration, and, thus being unnaturally weak, yield to pressure.

SYMPTOMS AND SIGNS.--One of the earliest symptoms of emphysema is shortness of breath; and, though at first it may not be very marked, yet as the disease advances it becomes more and more urgent, especially on going up stairs or walking up hill. Distension of the stomach by a full meal is likely to induce it, and even a slight degree of bronchial catarrh may render it extremely distressing. This symptom is due chiefly to two causes: First, the obliteration of numerous capillaries in the pulmonary system, occasioned by the thinning and destruction of the cell-wells in which they ramify, interferes with oxygenation, so that an increased number of inspiratory acts is required to supply the deficiency, and thus respiration is hurried; and, secondly, the impairment of the natural elasticity of the air-vesicles prevents the expulsion of their contents; the residual air remains, therefore, unchanged, and cannot supply oxygen to the blood; and thus increased expiratory efforts are made in order to expel the stagnant air and obtain a fresh supply. Notwithstanding this increase of both inspiratory and expiratory action, the movements of the chest are but slight. As far as bronchial catarrh is a cause of dyspnoea in emphysematous patients, improvement may take place in the warm dry weather of summer, when this symptom is often much mitigated.