Medical Jurisprudence, Forensic medicine and Toxicology. Vol. 1

by R. A. Witthaus; Tracy C. Becker

There are certain general pathological or occasional conditions of the body in which the blood during life does not coagulate at all or only imperfectly, as in scurvy and in the case of the menstrual blood. Also blood in a serous cavity, especially if it be abundant or there exists inflammation, is found not to coagulate or only imperfectly. Post mortem the blood remains liquid long after death in cases of death by drowning, asphyxia, etc., and in such cases hemorrhage may be free in a wound made some time after death. Furthermore, after putrefaction has set in the blood again becomes more or less liquid, and may flow away from a wound like a hemorrhage, but it no longer coagulates.

The principal signs of a wound inflicted during life are (1) hemorrhage, (2) coagulation of the blood, (3) eversion of the lips of the wound, and (4) retraction of its sides.

1. Hemorrhage varies in amount with the size of the wound, the vascularity of the part, and the number and size of the large vessels involved. In incised or punctured wounds the amount, as a rule, is quite considerable. If there is a free exit most of the blood runs off; the rest stays in the wound, where it soon coagulates with the exceptions mentioned above. But besides partly filling the wound in the form of a clot, the edges of the wound are deeply stained with the coloring matter of the blood, and this stain cannot be removed by washing. This staining involves especially the muscular and cellular tissues.

Further, a hemorrhage during life is an active and not a passive one; the blood is forced into the interspaces of the tissues in the vicinity of the wound, and is found infiltrated in the cellular tissue, the muscles, the sheaths of the vessels, etc. It is here incorporated, as it were, with the tissues so that it cannot be washed away. In an ante-mortem wound the arterial nature of the hemorrhage may show by the marks of the jets of blood about the wound or on the clothes or surrounding objects. When a large vessel has been divided and the exit for the blood is free, this may run off without infiltrating the tissues or even staining the edges to any considerable extent, and there may remain but little in the wound. In the case of lacerated and contused wounds the amount of hemorrhage is less, but rarely fails entirely, and if the wound is in a vascular part it is liable to cause death from hemorrhage, though a whole limb may possibly be torn off without much hemorrhage. In the latter case, however, there are usually found clots of blood adhering to the edges of the lacerated wound and the ends of the vessels. In contusions where there is no wound of the skin the blood is prevented from flowing externally, and its accumulation and distribution form an ecchymosis. Here again we see the active power of the hemorrhage which infiltrates between the tissues, stains them deeply, and appears either as a mere stain or in fine clots incorporated, as it were, with the tissues or partly occupying a cavity formed by an extensive displacement of the surrounding parts. The amount of blood varies under the same conditions as in incised wounds, and also according to the greater or less disintegration of the tissues by the blow, allowing a larger or smaller central cavity to be formed. In “bleeders” the amount of the hemorrhage does not vary under the normal conditions, but a fatal hemorrhage may occur from a very insignificant wound. After hemorrhage from a wound made during life the veins are empty about the wound, especially those situated centripetally, while normally after death the blood is mostly aggregated in the veins. They are the source of post-mortem hemorrhage, but do not empty themselves to any great extent.

The hemorrhage from a wound made after death may be extensive if the blood remains fluid as in the cases mentioned above, i.e., after death from drowning or asphyxia or after the commencement of putrefaction. Otherwise the amount of hemorrhage decreases with the length of time after death, until the blood loses its fluidity and hemorrhage no longer occurs. In general, it is slight unless a large vein is opened, for the veins are the source of the hemorrhage. There is usually scarcely any hemorrhage after the first two to four hours. This applies also to subcutaneous hemorrhages or ecchymoses. These post-mortem hemorrhages are passive and not active, consequently there is less infiltration of blood into the surrounding tissues, which merely imbibe it, and the stain is less deep and may be washed off the edges of the wound, in contrast to the stain of ante-mortem wounds. After putrefaction has set in the hemorrhage may be more abundant, as the blood is driven to the surface by the formation of gas in the abdomen and thorax. At the same time, the coloring matter of the blood transudes through the walls of the veins and is imbibed by and stains the tissues, so that it may be impossible to distinguish it from a true ecchymosis. Fortunately these conditions are of small moment, as an examination is seldom deferred so long.

Cadaveric ecchymoses show almost invariably while the body is still warm and the blood more or less liquid, i.e., during the first eight or ten hours after death. They are not due to injury or violence before or after death, but they may closely resemble ecchymoses produced on the living body and be mistaken for them. This is the more important as they are quite constant on the cadaver.

In this connection, it may be said that an ecchymosis due to a blow before death may not show till after death, as it requires some time for a deep ecchymosis or even an ecchymosis covered by a thick layer of skin to show superficially. Thus a man kicked in the abdomen died thirty-five hours after the injury from peritonitis, due to a rupture of the bladder. No ecchymosis appeared at the site of the injuries until after death. It is not uncommon in cases of hanging to observe an ecchymosis along the course of the cord appearing only after death. Huize met with a case of this description. Devergie remarked that on the bodies of those drowned ecchymoses are often hidden for a time on account of the sodden state of the skin, and they appear only after the water has evaporated, which may require some days. Furthermore, it is not necessary to survive long after an injury in order that an ecchymosis may show post mortem. If the blood is fluid at the time of the blow and any capillaries or larger blood-vessels are torn, then we may have an ecchymosis though death be almost instant. Casper thought that it required some time before death for an ecchymosis to develop, and that if the person injured by a contusion died soon after the injury, an ecchymosis would not appear after death. There are many well-authenticated cases to prove that Casper’s opinion is wrong. Among the most famous of these is that of the Duchesse de Praslin.[615] She was attacked and killed by her husband while she was asleep in bed. The thirty or so wounds showed a mortal conflict, and she could not have survived more than one-half hour, and yet after death there were numerous ecchymoses from the contusions.

Another case is also mentioned by Taylor.[616] A young man died suddenly after a blow from a companion, having been struck in the side a fortnight before by a heavy box, which knocked him senseless and nearly killed him. The post mortem revealed an ecchymosis on the side which on the authority of Casper’s opinion was attributed to the old injury. The color of the ecchymosis would be sufficient to settle all such doubts, as the changes of color would have fully developed or the color even disappeared in part in fourteen days’ time.

An ecchymosis made post mortem does not undergo the color changes seen in ecchymoses during life, unless the tissues are œdematous in which the ecchymosis occurs. These changes in color have already been described, the deep blue changing to violet in eighteen to twenty-four hours at the earliest. In support of the foregoing and disproving Casper’s views, Christison found that within two hours after death severe blows on a dead body are followed by a livid discoloration, similar to those produced by a blow shortly before death. This livid discoloration is due to the effusion of a very thin layer of blood external or superficial to the true skin, sometimes in a stratum of the true skin or more rarely into the cellular tissue, staining deeply the partition walls of the fat-cells. Of course, a more or less recent contusion or ecchymosis on a dead body was not necessarily produced at the same time as the cause of death. It should be borne in mind in this connection that ecchymosis is not a necessary result of a blow or contusion.

According to Devergie, ecchymosis does not appear when a blow inflicted post mortem is received by skin directly covering a bony surface beneath, and rarely appears where there is a large amount of fat and no solid point of resistance beneath the site of the blow.