EFFECTS OF BURNS.
The effects of burns may be considered as I., Local, and II., Constitutional.
Local Effects.—In different instances the effects vary in accordance with the extent and severity of the burn. Redness, blisters, destruction of the cuticle and of the subcutaneous cellular tissue, blackening of the skin, scorching of the hair, and roasting of portions of the body are met with in varying degrees. In some severe cases all these are found upon a single body. The redness produced varies in intensity and extent, according to the nature of the agent producing the burn, its form, and the length of time the part was exposed.
Very soon after the infliction of the burn a special line of redness appears between the burned parts and the uninjured skin. This red line of demarcation is formed by intensely injected vessels and becomes a very important medico-legal sign in some cases. The vesication may be single or multiple, consisting of one or two large and full blisters or a number of large and small ones, scattered over the portions burned, some unbroken and still holding their contents, others broken and denuded of cuticle or with breaks from which their serum has escaped upon the surrounding parts. In some cases of burning cracks or fissures in the skin occur, due to the effect of the heat, making it dry and brittle and causing it to rupture by the movements of the patient (Case 8). These fissures are most frequently noted in proximity to the joints.[704] They resemble wounds, and it occurs occasionally that it is important to accurately distinguish their character. In some cases the skin only is fissured; in others the subjacent tissues are also involved. This difference depends upon the depth of the burn. In the first condition the skin splits, leaving the subcutaneous fat exposed, which in some instances is partially melted by the heat and flows out over the edge of the crack upon the surrounding skin (Cases 8, 13). The blood-vessels in such cases usually are not burned and, owing to their elasticity, remain stretching across the fissure (Case 14). The smaller may be seen by careful examination with a lens: they should always be looked for. In the second class of injuries the vessels are involved in the burn and break with the cracking of the skin. The importance of careful observation of these fissures is emphasized in cases of apparent wounds associated with burning. It may be necessary to decide whether the wounds are the result of the action of heat as above described or were caused by some sharp instrument or weapon. Careful inspection of the edges of the wounds will show whether they are ragged, as the result of fissure, or clean-cut by some sharp instrument. The absence of evidences indicating hemorrhage upon the surrounding parts and the detection of uncut blood-vessels extending across the fissure will establish the differential diagnosis. Wounds of the above character resulting from the action of fire may exist on the same body with wounds of actual violence. It is important, therefore, in all cases to examine each wound with special care and record its position, shape, depth, and other characteristics.
Constitutional Effects.—As in all sudden and violent injuries, the effect of a severe burn upon the nervous system is very marked. This is manifest in the symptoms of “shock,” with pallor and coldness of the surface of the body, a feeble pulse, chills or shivering, and a tendency to collapse. In other cases, proving immediately fatal, these symptoms are followed by obstructed respiration with death from coma succeeding. In other cases convulsions precede death, while in such as are not immediately fatal a reaction more or less imperfect ensues upon the first constitutional symptoms.
Death from cerebral congestion or effusion may result before any definite evidence of reaction appears. In some instances pulmonary congestion or œdema occurs, with or without pleural effusion, terminating in death before reaction. This period usually covers the first two days. In some cases immediate death results from the depression produced by the severity of the pain. During the subsequent two weeks a period of inflammatory reaction succeeds, when inflammations of the thoracic and abdominal viscera, with ulcerative processes in some organs, are developed and induce a fatal termination (Cases 10, 11, 16).
Causes of Death.
The causes of death are due to several conditions. This fact is explained in part by the relation which exists between the cerebro-spinal and sympathetic nervous systems, and of the nervous supply of the surface to that of the internal organs, which in cases of extensive injury proportionately modify the conditions of the visceral organs. As death in burning results from various causes, it is convenient to consider them under two classes:
1st. Those immediately fatal.
2d. Those fatal after an interval.
The FIRST DIVISION would include cases in which the deprivation of fresh air and the presence of asphyxiating products of combustion (carbon monoxide and carbon dioxide) were the immediate causes of death by suffocation or asphyxia (Cases 9, 18).
Accidents in endeavoring to escape or injuries by falling walls or timbers may cause death immediately, and burning the body occur subsequently.
Immediate death may result from syncope or collapse from the violence of the shock to the nervous system by the pain resulting from the burns.
The SECOND DIVISION includes those conditions where death may result early, from a series of causes less immediate than those just mentioned.
Cerebral congestion and effusion, resulting in death from coma, is not unusual (Case 15). In this connection Taylor[705] cites a case of alleged poisoning by opium, in the treatment of a burn, in a child dying comatose, and emphasizes the undesirability of administering opium or its preparations to children in cases of burns of any severity. The danger claimed to exist is hardly to be considered. In the case referred to, Abernethy, who was a witness in the case, ascribed death to coma induced by the effect of the burn. The powerfully depressing influence of the pain in sensitive organizations and liability to death from shock therefrom must be remembered.
Inflammatory conditions of the respiratory tract or organs are common results; pneumonia, bronchitis, and sudden congestion or œdema of the lungs are frequent (Cases 11, 15, 16).
Inflammation of the intestines, inducing peritonitis and ulcerations of the intestines with or without resulting hemorrhage, occurs as a frequent lesion (Case 10).
Gangrene or septicæmia causes death in other instances.
Exhaustion, from extensive and prolonged suppuration or from severe and long-continued pain and other conditions, terminates other cases (Case 12).
Legally, burns and scalds are included among injuries endangering life, but are not described as wounds. They may be considered dangerous according to the extent of surface which they cover, rather than the depth to which they involve the tissues.
The extensive injury to the sensory nerve structures and the suspension of function or destruction of a considerable portion of the perspiratory tracts render large superficial burns far more fatal than those confined to a small part of a limb, for example, which may be deeply burned. From a medico-legal point it is desirable to establish the fact of how large a surface must be injured to prove fatal. The effort to reduce the subject to a statement of an exact minimum area of square inches seems very objectionable and liable to lead to erroneous conclusions.
It is possible to make a general statement, subject to some qualifications, which may serve as a basis of conclusion, as each individual case must be considered in its own circumstances.
A burn involving two-thirds of the body may be regarded as necessarily fatal; but the injury of a much less proportion, even one-fourth of the surface, has resulted in death. The qualifications to be made in burns of less extent are pronounced. The part affected is of much importance. Burns of the trunk are more fatal than those of the extremities; and those of the genital organs[706] and lower part of the abdomen are especially so (Case 7).
The character of the burn, whether single and continuous or multiple and scattered over various portions of the body, is a very important modifying circumstance, involving the questions of excessive pain and the difficulty in insuring necessary treatment for all parts injured.
The physical condition of the patient and sensitiveness of the nervous system to pain exert a powerfully determining influence. Burns in children and sensitive, nervous females are specially serious and call for an unfavorable prognosis.
Spontaneous Combustion.—Spontaneous combustion of the human body has been seriously discussed in this connection, and explanations of popularly reported cases have been attempted. The writer refers to the subject here for the sole purpose of stating that no trustworthy evidence of the possibility of any such condition or result exists.
Treatment.
In cases of severe burns the constitutional as well as the local conditions demand attention. Locally, a great variety of applications has been employed: starch, gum, oxide of zinc, solution of caoutchou, collodion, cotton wadding, a mixture of linseed oil and lime-water on cotton or lint, and many other agents are used. The important consideration is to exclude the air from and to afford a protective covering for the injured surface. The constitutional treatment varies in different cases; but its main object is to relieve pain, induce reaction from the shock, and support the depressed nervous system.
For the first opium or its preparations in proper doses is indicated. Alcoholic stimulants in some cases are demanded in addition. After the stage of reaction has occurred the therapeutics must be governed by inflammatory conditions; or later by the exhaustion from continued pain, suppuration, etc.
Post-Mortem Appearances.
In the EXTERNAL post-mortem examination of a burned body careful note should be made of the sex, probable age, and every circumstance leading to the establishment of the identity of the individual. The parts burned should be specially examined as to their condition, whether exhibiting redness, vesication, or charring. The amount of surface covered by the burns should be computed; also the relation of the burned parts to those uninjured, whether separated by a sharply marked line of redness or merging into the sound skin without a line of demarcation. The condition of the blisters should be examined as to whether they are full or empty and their contents as to whether consisting of clear or turbid serum.
Internally.—In some cases no lesions are found on examination. These are usually cases where death occurred from shock or severe pain (Case 12). Ordinarily the mucous membrane of the respiratory tracts is congested. In some instances, however, no redness has been discernible. Where death occurred by suffocation and asphyxia, the trachea and bronchial tubes have been found to contain a dark smoky or sooty mucus[707] (Case 9).
The serous membranes of the brain, thorax, and abdomen are in many cases found reddened with effusions, more or less considerable, into the ventricles of the brain and the pleural, pericardial, and peritoneal cavities from the sudden inflow of blood from the surface, caused by the local injuries.
When the body has been badly charred or incinerated the skeleton usually remains, and it is possible to determine the age from the size and development of the bones and the sex from the shape of the bones of the pelvis. Careful search should be made for special articles of identity. False teeth,[708] a watch and chain, buttons, etc., have alone been sufficient to identify the incinerated remains (Case 23). Where the whole body and even the bones have been reduced to ashes, some portions of bone, etc., may be found on careful search. Sifting the ashes will give some pieces of bone, etc., which may be sufficient to disclose the presence of human remains[709] (Case 24). A chemical analysis of the ashes also will aid in establishing this fact. In cases where cremation of the body has been resorted to to conceal crime, the length of time necessary to entirely consume the human body may become an important question. A period of less than ten hours has been proven sufficient.[710]
Period of the Occurrence of Death.
As already indicated, death may occur from direct causes during the first forty-eight hours after the infliction of the burn, or may take place during a period extending from the second day to the fifth or even the sixth week. In the great majority of cases the fatal result occurs during the first five or six days. In some instances it may be important to establish the fact as to how long after the infliction of the burn the person may have survived.
Inflammation and suppuration would not ordinarily begin until about the third day, hence the existence of this condition would indicate that the person had probably lived two days or more; and the state of advancement of these processes would afford some further evidence. The existence of intestinal inflammations and ulcerations, which require some days for their appearance and development, would also give some indication of the probable time elapsing.