Emphysema, as a medical disease, is opposed to the surgical disease, in not being an extravasation of air into the cavity of the chest, but a dilatation of the air-cells formed for its reception. It is of two kinds, Vesicular and Interlobular—vesicular when dependent on the enlargement of one or more air-cells; interlobular when, from the sudden rupture of an air-cell, the air has found its way into the interlobular structure of the lung. A third and very rare kind has been added, in which air, being extravasated under the pleura, has raised it in the form of a pouch. The morbid appearances these diseases afford, and the symptoms they give rise to, do not fall within the range of surgical skill; and are not frequently within the controlling power of medical science and ability.
Emphysema is free from redness, and is distinguished from edema, or the swelling containing a serous fluid which is also colorless, by its not pitting on pressure, or retaining the mark of the finger. It is, on the contrary, elastic; and the displacement of the air, on pressing on the part, gives rise to a peculiar noise, resembling the crackling of a dry bladder partly filled with air on its being compressed, usually called crepitation. This swelling extends as the air introduced increases in quantity until the whole of the areolar tissue of the body may be fully distended.
Emphysema most commonly occurs from fractured ribs, a point from one or more of which abrades the surface of the lung. Through the opening thus made, the air escapes into the sac of the pleura, and thence by the side of the broken part of the ribs into the cellular membrane. The distress in breathing arises from the air being diffused over the surface of the lung, which it gradually causes to collapse under the pressure exercised by the act of expiration; while, at the same time, the mediastinum yielding, the opposite lung suffers in a similar way, although to a less extent, until the aerification of the blood is so greatly obstructed as at last to interfere with life, unless relief be obtained by the equalization of the pressure made on the lung by the compressed air in the cavity of the pleura, with that exercised on the inside of the lung through the glottis.
In ordinary but not severe cases of fractured ribs, a slight degree of emphysema is frequently observed over the injured part, implying that the lung has been wounded; such a case requires the application of a compress, wetted with a little spirit and cold water, retained by a bandage. The great art in the treatment of broken ribs by compress and bandage consists in their proper application, which can only be ascertained by the feelings of the patient. The application of a broad flannel bandage, so as to restrain the motions of the chest, and to cause the sufferer to breathe by the diaphragm, has been recommended from the earliest periods of surgery; but many persons with injured or broken ribs cannot bear the pressure of a bandage, while others derive much ease from its use. A tight bandage generally disagrees when the injury has been sustained at the lower part of the chest, and is more frequently useful when the fracture is above the fifth or sixth rib.
When the emphysematous swelling extends so as to invade a considerable portion of the body, the further diffusion of air should be prevented by punctures made through the skin in such places as may be thought necessary, and in extreme cases even by incisions; but these are things more often spoken of and written about than practiced, or than are even necessary.
323. Mr. J. Bell had so alarmed all military surgeons by stating, in his able discourses on the Nature and Cure of Wounds, that emphysema was “peculiarly frequent in gunshot wounds of the chest, both at the orifice of entrance and of exit of the ball,” that they thought of little else. They could not withstand the brilliant manner in which this remarkable error—for error it is—was expressed. To such of us as had served in the first part of the war in Portugal it was no longer a bugbear; we slept in peace after the battles of Roliça and Vimiera, of Corunna, of Oporto, and Talavera—laughing, perhaps, a little at the credulity of the surgical portion of mankind; for the opening made by a musket-ball rarely admits of emphysema. A slanting wound made by a pistol-ball may sometimes give rise to it. After long and tortuous wounds made by swords or lances it is seen more frequently, but then it takes place shortly after the receipt of the injury.
A soldier, at the battle of Albuhera, was wounded in the right side of the chest by a sword, which had passed slantingly under the shoulder-blade, from which injury he did not suffer much, until the whole side as well as the body and neck began to swell and impede his breathing, which was effected with some difficulty and with any ease only when sitting up. The external wound was enlarged until I could distinctly hear the air rush out and see the part where the weapon had penetrated between the ribs; upon which he declared himself relieved, when the wound was closed by compress and bandage. It did not unite, however; active inflammation of the cavity of the chest ensued, requiring frequent and considerable losses of blood for its suppression. At the end of three weeks the man was sent to Elvas, in a favorable state for recovery.
324. When an opening is made into the cavity of the chest in the dead body, the lung recedes from the pleura lining its wall, for some distance; it is said to collapse; but this does not take place in anything like the same extent in the living body; and if the continued admission of air through the wound be prevented, it scarcely takes place at all; or, should it have done so, the air is usually absorbed and the lung quickly recovers its natural dimensions and functions. Neither does a wound in the chest, when kept open, usually cause this collapse to the extent which it is generally supposed to do in the living body. The lung can be seen in motion and performing its office, although imperfectly, as it does not fill the cavity of the pleura. When the lung has been wounded by a ball actually going through its substance, it does not necessarily collapse; and abrasions or deeper injuries of its surface lead to no such result. To cause the complete collapse of a living lung, its surface must be compressed by a fluid, as in empyema, or by confined air, as in emphysema or in pneumothorax.
In extreme cases, when the patient can no longer lie down, but sits up, supported, in the greatest agony of respiration, approaching to suffocation, the face and lips swollen and blue, the pulse almost imperceptible and countless, an opening should be made into the chest by a small trocar and canula, for the purpose of evacuating the highly compressed and compressing air, and to allow the expansion of the lung after its evacuation. When this compressed air has been drawn off, as in the case of Lord Beaumont, the compressing power being removed, the lung expands in part, if not entirely, in spite of the breach in it, and the mediastinum and heart return to their natural situation, the distress in breathing is removed, the failing circulation is restored, and the opposite lung resumes its functions.
The course then to pursue in such extreme cases is merely to puncture the chest, evacuate the air, withdraw the canula, and close the opening. The life of the patient having been thus saved, time is given for the wound in the lung to heal under the usual inflammatory processes, provided it will do so without a recurrence of the mischief. This, if it should take place, must be met by another puncture, or the opening in the chest should be made permanent in order to equalize the pressure of the air in the cavity.