Part 36

In croup, there is confusion and pain of the head, the lips are of a livid hue, and the veins of the neck are much distended. Respiration is extremely laborious, the chest and nostrils heave, and all the auxiliary muscles of respiration are called into play. Sleep is broken and unrefreshing; the patient starts, much alarmed, from a feeling of impending suffocation, and catches at the nearest object. The circulation is accelerated, and becomes weak and irregular as the disease advances.

A common cause of croup is exposure to cold and damp; but the frequency of its occurrence in children is attributable to dentition. Dentition induces a long catalogue of infantile diseases, and is intimately connected with most cases of croup. Children are besides of a peculiarly irritable system; and in them disorder of the digestive organs may, in many instances, be considered as at least a predisposing cause, and in all cases it is a constant attendant on the disease. It may also be occasioned by inflammatory action extending to the larynx and trachea from a neighbouring surface; from the fauces, for instance. In some instances inflammatory swelling has been produced by the direct application of stimuli to the membrane; as by the patient inadvertently swallowing boiling water, and a portion of the hot fluid, or rather of the steam, being drawn into the windpipe. It is supposed that certain slight degrees of this affection are to be ascribed to spasm; in nervous and hysterical females, paroxysms of slight difficulty in breathing are not of unfrequent occurrence, and in them it may be ascribed, with much probability, to a spasmodic action. The expiration may be then performed with difficulty, and occasionally there is almost complete aphonia. In children, dyspnœa, apparently dependent on spasm, is produced by some affection of the base of the brain.

The most desirable termination of the disease is of course resolution—the cough, pain, and uneasiness subsiding, and the constitution gradually attaining its former state of composure. Too frequently, however, the inflammatory action proceeds unabated, and terminates in effusion of lymph, which is generally of great extent, adhering to the surface of the mucous lining, and forming what is termed a false or adventitious tubular membrane. On the occurrence of lymphatic formation, dyspnœa is much aggravated; and the second stage of the disease is then said to have commenced. Occasionally the patient sinks before effusion has taken place. The extent to which the pseudo-membranous deposit occurs is extremely various; in some cases it is confined to the larynx, or to the upper part of it; in others it lines the whole of the windpipe, and often is prolonged, either in flakes or tubes, into the ramifications of the bronchi. In general, it is not at every point adherent to the mucous membrane, but more or less detached, particularly at its inferior extremity, by a quantity of vitiated mucus which intervenes between it and the mucous surface, and is intimately adherent to the latter. The mucous membrane is also slightly elevated by effusion into the subjacent cellular tissue.

By the formation of false membrane, the symptoms may be so much increased as to cause speedy dissolution; but in many cases the patient’s strength is not altogether exhausted, and the extraneous substance by its irritation causes frequent and violent attempts to expectorate, by which the lymph is not unfrequently expelled either entire or in irregular portions; the relief thereby afforded, though considerable, is in general temporary, for lymph is speedily redeposited, or there is a profuse muco-purulent expectoration, and the patient succumbs. It has been already stated that a portion of the false membrane is usually detached from the lining membrane of the canal, and from this the existence of the membrane is in general easily recognised; for on its being moved by the passage of air in the canal, a peculiar sound is frequently audible, and has been compared to that made by the movement of the valve or clapper of a pump. When perceived during inspiration, it indicates that the membrane is detached at its superior extremity; when in expiration, that the separation has occurred inferiorly. A fatal termination may suddenly take place, in consequence of the detached extremity being so displaced by the passage of the air as to form a complete valve, obstructing respiration, and causing death by suffocation.

When the inflammation extends into the bronchi and substance of the lungs, laborious breathing and the mucous rattle occur. The bronchi are obstructed by vitiated mucus, or by lymph, and serum is effused at the base of the brain; and from either or both of these circumstances the patient soon perishes. In children the gums should be looked to, and if swollen or tender, they must be freely scarified; this always affords relief, and often forms the most important part of the treatment. The bowels must be completely freed from the fetid dark-coloured matter which they contain; and if this be effected at an early period, it will generally be sufficient to arrest the progress of the disease. Calomel is the medicine usually preferred, not only from its excellent qualities as correcting and purging out the vitiated secretions, but also on account of its supposed effect of preventing lymphatic effusion. To the procuring of copious evacuations from the stomach and bowels, the attention of the practitioner ought to be chiefly directed at the commencement. With the same view, emetics are of much service. The warm bath will be of use in promoting the cutaneous discharge, and assisting to allay irritation. When the inflammatory symptoms are violent, bleeding, both local and general, is indispensable, and must be had recourse to early; for during the commencement only of the disease can it be of service. The first, or acute, inflammatory stage is of but short continuance, speedily terminating in effusion; and when this has occurred, the symptoms all denote debility of the system, and will be irreparably aggravated by depletion. The most effectual mode of abstracting blood, is by opening the external jugular vein, and this may be followed by the application of leeches to the forepart of the neck; in the second stage of the disease, their place is to be supplied by blisters, and other counter-irritants. Much benefit will be derived from the continued use of nauseating doses of the tartrite of antimony; in the first stage the vascular action will be thereby subdued, and in the second the medicine acts as a powerful expectorant, determines to the surface, and promotes the evacuations from the bowels. Often, however, the disease defies all sanative measures, and advances unsubdued to a fatal termination.

Tracheotomy has been both proposed and performed in this disease. Recourse to it is not warrantable till the later period of the affection, and then it will be found unavailing. If performed early, there is found no obstruction to respiration that can be removed; it can therefore be of no service, and is not required. If it be undertaken at a more advanced period, lymph will most probably be found to extend below the incision; the bronchial tubes and the substance of the lungs are then the principal seat of the disease, and consequently the operation is futile, at least in children. When first I entered on practice I was several times prevailed on to perform tracheotomy on children labouring under croup; the results were unsuccessful, and from my own experience I cannot recommend the practice.

The fauces and larynx of children are occasionally injured, as stated above, by the attempt to swallow by mistake boiling water, and inhaling the steam. The alarming symptoms follow in a very few hours, in consequence of the formation of numerous minute vesicles, with swelling, from effusion of serum into the submucous tissue. Great pain is generally experienced at the moment, but after crying violently the child may fall asleep and awaken croupy, and with threatened suffocation. By this time inflammatory action has been fairly established, the submucous effusion has begun to take place, and it is this that gives rise to the danger. The excited action is to be combated by leeching and exhibition of calomel in small doses, with or without opium frequently repeated, so as to arrest the lymphatic effusion, which is apt to supervene. When these means fail, tracheotomy must be resorted to without delay. The fauces and upper part of the larynx are only involved at first; this practice is sound, and good success may be expected from the operation. The breathing has been suddenly suspended in children by the attempt to swallow acrid fluids, such as alkaline solutions, or concentrated acids.

Cynanche laryngea, in adults, is of comparatively rare occurrence; at least that kind of inflammation of the windpipe, which in children is so rapid in its progress, and so prone to terminate in effusion of lymph, is not often met with in persons of an advanced age. Inflammatory affections of the larynx and trachea are, however, by no means unfrequent in adults; but are of a very different character, as to symptoms, progress, and termination, from that affection which is strictly denominated croup. Pain is felt in the region of the windpipe, and is aggravated by pressure on the forepart of the neck, by speaking, and by deglutition; expectoration is increased, and ultimately assumes a muco-purulent character. The voice is altered in tone and in strength, and occasionally there is complete aphonia. Frequently these symptoms, after having continued for a short time, gradually subside; if not, the mucous membrane, particularly in the upper part of the larynx, becomes thickened and considerably softened in texture, with effusion of serous fluid in the subjacent cellular tissue, and apparently in the substance of the membrane itself. In consequence of such effusion, the difficulty of breathing is much increased. Occasionally lymph is effused on the surface of the membrane; but this is seldom met with, and when it does take place, is generally confined to the upper part of the larynx. The larynx and trachea of an old lady of seventy years is here shown, with very extensive false membranes blocking up the bronchi; a large portion besides was coughed up. The specimen, a rare one, is in my collection.

The effusion of serum is often abundant, causing protrusion of the mucous membrane, and narrowing of the canal; and when it is limited to the upper part of the larynx, as frequently happens, the disease is termed Œdema Glottidis. In this affection, the majority of the symptoms, which have been already enumerated as attendant on laryngitis, are all present, and in an aggravated form. Inspiration is extremely difficult and sibilant, and occasionally the patient experiences a sensation, as if a foreign body were lodged in the passage, and had changed its position on the muscles of the part being put in motion. The symptoms of œdema come on gradually in some cases, in others with alarming rapidity. They often follow ulcerations of the soft palate, and of the root of the tongue, as shown in treating of diseases of that organ, occurring on the patient being exposed to cold or moisture, or supervening rapidly when discharge from the ulcerations is by any accident suddenly suppressed. The difficult breathing, with cough and violent attempts at expectoration, takes place in paroxysms, and often to so alarming a degree as to threaten immediate suffocation, especially during the night. The patient, if he has fallen asleep, often starts up suddenly, and catches at the nearest object, having dreamed probably of drowning or strangulation. Deglutition is seriously impeded, the strength is exhausted, the body is emaciated, the features become contracted, and evince great anxiety. As already stated, the serous effusion is chiefly situated in the upper part of the larynx, particularly on the lips of the glottis, and on the inferior surface of the epiglottis; and on introducing the finger, a soft swelling can be felt beneath this cartilage. Perhaps the following sketch exhibits the most complete instance of œdematous swelling of the rima glottidis to be found in collections of morbid anatomy. The patient was brought to the Royal Infirmary labouring under all the symptoms of the disease in a very aggravated form. Tracheotomy was performed without delay, and with instant relief. The patient fell into a quiet and profound sleep, which lasted for six or seven hours. He started up suddenly and fell down dead; probably the end of the tube had become obstructed by mucus. It is scarcely to be supposed that the patient could have breathed at all with such a state of parts at the top of the air-tube, as here represented. Could any of the swelling have come on in the interval betwixt the performance of the operation and his sudden death? In some instances, the disease rapidly proceeds to a fatal termination, the glottis being speedily and entirely shut by the swelling; in others, the patient lingers for weeks, or even months.

Depletion, local and general, especially the former, if employed on the first appearance of the inflammatory symptoms, will often arrest their progress; but if practised at a more advanced period, it can be productive of no benefit, and if any advantage does follow, it is merely temporary. Sometimes considerable benefit will be derived from the use of blisters, or from the unguentum tartritis antimonii being rubbed on the sides of the neck and over the larynx, so as to produce an eruption of numerous pustules. When all hopes of procuring resolution have passed, and when the urgent symptoms occasionally threatening suffocation supervene, tracheotomy should be performed without delay; and it ought to be borne in mind, that the more early this operation is resorted to, the greater is the chance of success. It has been repeatedly stated, that the disease is confined to the larynx, and, in most instances, to the upper part of it; so that, by making an opening in the windpipe below the thyroid gland, the disease is situated above the incision, the patient breathes through a canal which is in its healthy state, the affected parts are set at rest, and from their remaining comparatively motionless the disease often subsides spontaneously; if not, the various applications to the parts can be employed much more successfully than before; for when the parts remain subject to constant irritation from the movements necessary for respiration and nutrition, all medicines and all topical applications are generally productive of little or no benefit. But if the incision be made into the crico-thyroid membrane, we shall, in most instances, cut into the very middle of the disease; at any rate, the affected parts can be at no great distance from the incision, and the irritation of the tube will be a sufficient cause to excite inflammatory action in parts contiguous to the original disease, and already disposed to assume a similar action; thus the disease may be extended. I have performed tracheotomy on a very considerable number of patients afflicted with œdema glottidis, and I may say, with almost uniform success. The disease was speedily subdued, and in most of them there was no great difficulty in closing the artificial aperture, and restoring natural respiration. The relief afforded by the operation is almost instantaneous; the performance of it, if skilful, is attended with no danger; and want of success will generally be found to proceed from its having been too long delayed.

In consequence of laryngitis, or of long-continued irritation in the neighbourhood, the mucous membrane becomes indurated, and subsequently ulcerates; or ulceration may extend from the fauces. In some cases, the ulcers of the larynx are few, and of slight extent; in others, they are more numerous, and of considerable width and depth; and in some there is extensive and uninterrupted destruction of the surface, surrounded by thickened and elevated mucous membrane. This disease is termed Phthisis Laryngea. It is characterised by constant tickling cough with expectoration of purulent matter; by pain in the region of the larynx increased on pressure; by great prostration of strength, with general sinking of the vital powers, and frequently by hectic fever. From extension of the ulceration, the vocal chords, the ventricles of the larynx, and the mucous folds forming the rima glottidis, are more or less injured, and frequently altogether obliterated; partial or complete aphonia is the consequence. In phthisis laryngea, especially when advanced, swelling from serous effusion, to a greater or less degree, almost certainly supervenes, the œdema is found in the upper surface of the epiglottis, beneath the mucous membrane, upper and forepart of the pharynx, and occasionally also in the lips of the glottis,—an effect of the contiguous ulceration,—in the same way as œdema glottidis supervenes on ulceration of the lining membrane of fauces and pharynx; the usual train of symptoms denoting phthisis laryngea may thus be interrupted by those of œdema of the glottis becoming (each paroxysm) more and more urgent, terminating in suffocation or relieved by tracheotomy.

From the reasons which have been already stated, inspiration is performed with difficulty, and accompanied with a wheezing and rattling sound, resembling the passage of air through a narrow aperture lined with viscid fluid. Deglutition is difficult; and, from the inactive state of the muscles which naturally close the glottis during swallowing, and from the greater or less destruction of the epiglottis, a portion of the fluid taken by the mouth escapes into the windpipe, produces violent coughing, and is ejected by the mouth or nostrils. As the disease advances, the lungs become affected, the patient is incapacitated for ordinary exertion by the dyspnœa which ensues, he grows weak and languid, and seems, in fact, to labour under phthisis pulmonalis. Not unfrequently the two diseases are combined; but, in the majority of cases, the affection of the lungs supervenes on that of the larynx. Ulcers with tubercular bases are very frequent about the ventricles of the larynx in subjects dead of pulmonary phthisis. The chordæ vocales are thus often exposed. The affection of the lungs is perhaps attributable to frequent and harassing cough, occasioned by the state of the larynx and ejection of profuse vitiated secretions.

When the ulceration extends deeply, portions of the cartilages sometimes become diseased; the soft parts surrounding them are destroyed, they become necrosed, and are expectorated along with a quantity of highly fetid purulent fluid. In some instances, the expectorated portions are osseous, of loose texture, irregular margins, and dark colour, exhaling an odour intolerably fetid. It sometimes happens that the ulcerations proceed still more deeply, perforating the parietes of the canal, and establishing a communication betwixt the windpipe and gullet; or, if the perforation is anteriorly, the communication is with the cellular tissue on the forepart of the neck, abscess forms which may attain a large size and be productive of much inconvenience and danger.

The disease has been frequently produced by mercury, when the abuse of that mineral was common; its abuse is still far from uncommon.

The symptoms may be mitigated by counter-irritation. The parts covering the trachea should not be subjected to counter-irritation; in consequence of repeated blistering, the application of irritating ointments, effusion and thickening of the cellular tissue is caused, and this may prove a serious obstacle in the performance of tracheotomy, should that afterwards, as is too likely, be required. Setons may be inserted on the sides of the neck, and applications made over the box of the larynx. But tracheotomy affords the only hope of permanent relief; and if performed at an early period, if the lungs are not the seat of tubercular disease, as they too frequently are, there is every reason to expect that it will prove successful. It is followed by the beneficial results mentioned when speaking of the preceding disease, and the nitrate of silver can be applied to the more external ulcers, along with the internal use of sarsaparilla, &c. Ulcers, which there is every reason to suppose had been both extensive and deep, have healed even after the discharge of portions of dead, sometimes ossified, cartilage. The symptoms abate; the patient recovers, though in general with imperfect voice, as might be expected.

It may even be practicable to employ topical applications to the ulcers within the cavity of the larynx, as in the following case, which, though unsuccessful, shows the advantages to be expected from similar procedure adopted at a more early period. T. C., aged 22, had laboured under the symptoms of phthisis laryngea for five months previous to his application. He was much emaciated, and experienced great difficulty in swallowing, on account of the irritation induced in the region of the glottis; he had occasional cough, purulent sputa, and aphonia almost complete. The larynx was painful when pressed, the epiglottis was seen to be œdematous, and the general symptoms were of a hectic character. The œdema of the epiglottis was reduced by scarification.

The symptoms increased, notwithstanding counter-irritation and tonic remedies. The stethoscopic indications regarding the chest were so far favourable.

Tracheotomy was performed, and the patient felt very much relieved in consequence. On the tenth day after the operation, the inner surface of the larynx was touched with a strong solution of the nitrate of silver, applied by means of a bit of lint wrapped round the end of a probe slightly bent, and introduced upwards from the wound. The solution was applied every second or third day, and under its use the patient was remarkably benefited. He swallowed, spoke, slept, and looked better; the purulent sputa diminished, and the cough abated. He complained of less pain in the larynx, and seemed to be regaining strength, though slowly.

But after the lapse of several weeks, from imprudent exposure to cold, evident symptoms of bronchitis supervened, under which his constitution already shattered, speedily sank. The larynx was found extensively ulcerated, but at a number of points there were distinct marks of recent cicatrisation. The state of the lungs clearly showed that phthisis pulmonalis had not only commenced, but made considerable progress. The practice here detailed has been repeated again and again with good success.

Dyspnœa is caused by other circumstances besides those already mentioned; some rare cases are met with in which warty excrescences have grown from the seat of the vocal chords: a beautiful specimen from the collections of my friends, Messrs. Grainger and Pilcher, is here delineated. Dyspnœa frequently arises from paralysis of the muscles of the larynx, in consequence of effusion at the base of the brain, from long-continued irritation, as from an irritating cause seated in the mouth, and in old people from a general decay of the animal powers. In the last case, it is generally a symptom of approaching dissolution, as is the dysphagia which often attends it.

Severe dyspnœa is sometimes caused by external violence. A fine healthy child, aged eight, in running across the street, fell, and struck the larynx with great force upon a large stone. She was taken up quite lifeless, and some time elapsed before respiration was at all established. A gentleman finding her face livid, opened the temporal artery, and applied leeches to the throat, with some relief. I saw her about three hours after the accident. The breathing, inspiration more particularly, was exceedingly difficult; and this appeared to proceed not only from the injury to the larynx, probably occasioning loss of power in the muscles, but from the collection of some fluid in the trachea and its ramifications. The child was evidently in such a state that, unless active measures were resorted to, and that speedily, a fatal termination would soon take place. Tracheotomy was performed; a quantity of coagulated blood and bloody mucus was evacuated from the opening; and when the discharge and coughing had ceased, a tube was introduced. In eight days the tube was withdrawn, the aperture closed; and no unfavourable symptom recurred. In the museum at Chatham is a larynx showing fracture of the thyroid cartilage from the kick of a horse. The immediate consequence was great difficulty of breathing and rapid general emphysema. The patient, a young soldier, died soon after the injury.

Large or irregular foreign bodies, as coins, pebbles, portions of stone or of coal, seeds of fruit, &c., put heedlessly into the mouth, are apt to become impacted in the rima glottidis, and give rise to severe and dangerous dyspnœa, or even cause sudden dissolution. Smaller and smooth substances pass through into the trachea. Such accidents happen most frequently to children. Peas, beans, small shells, &c., slip into the air-passage, are obstructed for a short time in the rima, but are soon forced by the convulsive actions of the patient into the trachea, and frequently lodge in the right bronchus, it being more capacious, and more a continuation of the trachea than the left; or they remain loose in the trachea, and are moved up and down by the passage of the air. Immediately on their introduction, most violent coughing takes place, respiration is convulsive and imperfect, the patient writhes in agony, and is in dread of instant suffocation; the countenance becomes inflated and livid, and most strenuous efforts are made by nature to expel the foreign body. At length he is exhausted, and an interval of perfect quiet ensues; but this is soon interrupted by renewed attempts at expulsion. After a time, the intervals of repose increase in duration, and in many cases are so long continued, as to lull the patient and his friends into a belief that the windpipe contains no extraneous substance. But still violent fits of coughing supervene from time to time, and the dyspnœa is very alarming; on attentive examination, the presence of this foreign body may be ascertained beyond doubt by the peculiar noise produced by its movements in the passage; at the same time, thin mucus is copiously discharged from the lining membrane. Occasionally the foreign body becomes so placed in the canal as to form a complete valve, and then the labours of the patient to dislodge it are most painfully severe; if they fail, he is suffocated. During laborious breathing the neck sometimes becomes emphysematous. The parts may at length get accustomed to the presence of the foreign body, and all uneasiness subside. But danger, though not immediate, still remains. Foreign bodies have remained for years without causing much inconvenience; but in such cases they have generally settled in some remote ramification of the bronchial tubes; abscess commonly, sooner or later, takes place around, purulent expectoration follows, all the symptoms of pulmonary phthisis are established, the patient becomes hectic, and dies.

The existence of the foreign body, when suspected, is to be ascertained by accurate and attentive examination along the forepart of the neck, and by listening carefully to the sounds which may be present in the trachea; but the urgency and continuance of the symptoms will seldom leave the surgeon to entertain a doubt. If he attentively watch the patient, he can scarcely be mistaken. It has been recommended to examine the œsophagus previously to adopting active measures, a large foreign body impacted in that passage being capable of materially obstructing respiration by compression of the trachea; and it is safe and prudent to follow this recommendation whenever the least uncertainty exists regarding the real nature of the case.

When a foreign body has lodged in the windpipe, tracheotomy should be had recourse to without delay. In general, the offending substance presents itself immediately after the division of the trachea, and is expelled by a strong current of air. But in some cases it may be necessary to introduce instruments—probes, scoops, or small forceps—upwards or downwards, to dislodge and extract the body. A case in which a foreign body, which had lodged in the right bronchus for about six months, was successfully extracted, is detailed fully in the Lancet, and noticed shortly in the Practical Surgery, p. 416. A little blood from the wound may cause coughing for some minutes, but this soon ceases; the wound is closed after a few hours, respiration is completely reëstablished, and all that the surgeon has then to combat are the evil effects on the mucous membrane which the contact of a foreign body may have occasioned.

Tracheotomy is, in nearly all cases, preferable to laryngotomy. In disease of the windpipe, as formerly stated, it is better to cut into a sound part of the passage, or at least as far as possible from the seat of the disease. When an adult, for example, labours under acute laryngitis, the effused lymph is generally confined to the larynx, as was already mentioned; an opening below the thyroid gland is removed from the effusion, and by means of it the patient breathes through the natural tube yet sound; whereas, if the opening is made in the crico-thyroid membrane, the surgeon frequently cuts into the middle of the diseased part; little or no benefit follows, and, if the danger is not increased, equivocal good is all that can be expected from such an operation. Tracheotomy is also preferable for the removal of foreign bodies, unless it is certain that the body is impacted in the rima, for in such circumstances laryngotomy is much more suitable. In tracheotomy, the incision of the tracheal rings can be extended with much less injury than can division of the laryngeal cartilages, when the largeness of the foreign body, its being firmly fixed, or other circumstances, require that the wound be of considerable size. The risk or danger in the one operation is not much greater than in the other. Division of the crico-thyroid membrane and skin is effected by one incision; there is nothing important in the way of the knife. In very young children, when suffocation is threatened, as from the effects following upon the attempt to swallow very hot fluids, and the inhalation of steam, this operation may with great propriety be performed. Tracheotomy, on the contrary, requires to be proceeded in more carefully, particularly in children, in whom the neck is short, and the trachea deep. The tube is moreover very small, and not easily steadied. I had occasion, not long since, to open the passage in a child under sixteen months old, who had tried to swallow the contents of a teapot recently filled with boiling water. The difficulty experienced in such cases is often very great. Obstacles may also be presented by the thyroid and other veins being distended, and the soft parts are perhaps tumid and infiltrated with serum.

The patient, if adult, should be seated with the trunk erect, and by throwing back the head, space in the neck is gained. In a female on whom I operated some years since, this advantage could not be obtained on account of induration in the belly of the sterno-mastoid muscle, with contraction. The incision of the integument is commenced in the mesial line over the cricoid cartilage, and carried downwards, an inch in the adult, but proportionally shorter in children. The cellular tissue is divided by a few touches with the point of the instrument (a small scalpel or bistoury); the finger is then introduced to separate the sterno-hyoid muscles, and to feel for any stray vessels which may be in the way; for the thyroid arteries sometimes cross the line of incision, and it may happen that some of the larger arteries of the neck, by following an unusual course, become liable to injury, if the operation were rashly performed. The plexus of veins on the forepart of the neck is pushed downwards, and the isthmus of the thyroid gland, if it exist, is displaced slightly upwards; thus the rings of the trachea are cleared. The patient is desired to swallow his saliva, in order to elongate and stretch the windpipe; and the surgeon, seizing the favourable opportunity, pushes the point of the knife, with its back towards the top of the sternum, into the tube at the lower part of the incision. The instrument is carried steadily upwards, so as to divide three or four rings. It is not at all necessary to cut out any part of the rings of the trachea as recommended by some writers; contraction of the tube may afterwards result; nor can any good purpose be served by making the opening crucial.

If the operation has been undertaken for the removal of a foreign body, its object is usually accomplished immediately on division of the rings; if not, the substance must be dislodged by proper instruments, as was previously remarked. The opening is allowed to close after the oozing of blood has entirely ceased; but its edges must be kept asunder till then, lest the blood be drawn into the bronchial tubes, which occurrence, however slowly it take place, is always dangerous. The union and cicatrisation of such longitudinal wounds are soon accomplished; they close permanently in a few days, even after having been open for many weeks with a foreign substance interposed between their edges. The same obstacles do not interfere as in transverse wounds; on the contrary, every circumstance is in favour of rapid union.

When the object of the operation is to relieve respiration, impeded by disease in the superior part of the canal, a silver tube, of convenient curve, length, and calibre, is introduced into the wound immediately on the knife being withdrawn, and secured by tapes attached to the rings at the orifice of the tube, and tied round the neck. Frequently a violent fit of coughing, alarming to the patient, follows the introduction, in consequence of some blood having entered the trachea. But on the ejection of some frothy mucus, mixed with blood, the patient becomes quiet and tranquil, breathes easily, and feels composed and relieved. The form of the tube—the calibre gradually increasing from below towards the orifice—completely prevents any farther ingress of blood, by the uniform compression which it makes on the edges of the wound. The secretion of mucus in the trachea is increased by the presence of the foreign body, but the patient easily frees himself from its annoyance, being instructed to place his finger on the orifice of the tube, so as to narrow the aperture, when he wishes to cough and expectorate. In those cases where the operation has been performed without there being diminution of calibre of upper part by swelling or otherwise, expectoration through the tube is more difficult. Mucus, however, is apt to adhere to the inner surface of the tube, and thereby obstruct breathing; to prevent this, it is necessary occasionally to introduce a feather, or a probe wrapped round with lint, for some hours after the operation; the attendance of an assistant may be necessary for this purpose, but the patient readily undertakes the duty himself, on being made aware of its necessity. A double tube has been recommended, to facilitate the keeping of the passage clear, the inner one being occasionally withdrawn, cleaned, and replaced. But this is not in ordinary cases necessary. The frequent introduction of a feather, or probe, is sufficient for some hours after the operation, and in a very short time the patient finds that he breathes freely, though the tube is removed for a few minutes, in order to be cleaned. At first, a funnel-shaped tube is used, to compress the edges of the wound and prevent oozing, as already mentioned; afterwards, one of uniform calibre is more easily coughed through. The patient should be kept in an atmosphere of warm and equal temperature, and it is also prudent to place some cloth of very loose texture over the tube, that the temperature of the respired air may resemble as much as possible that passing through the whole track of the windpipe; thus bronchitis may be averted.