The BRAIN and pia mater are generally congested. This is said to be invariable if the eyes are congested. Mackenzie in thirteen cases found the brain congested in all.
The HEART varies much in appearance and condition. The right side is often full of blood; occasionally empty. Sometimes subpericardial ecchymoses are found, usually along the coronary vessels. The blood in the heart may be partly coagulated if the agony has been prolonged and there has been a partial access of air, which is gradually diminished. Mackenzie[912] found the right cavities full and the left empty in nine out of thirteen cases. Johnson[913] as a result of experiment on animals claims that when access of air is prevented there is a rise in pressure in the arteries, the right side of the heart fills, the pulmonary capillaries become empty, and therefore the left side of the heart becomes empty. As a result of further experiments[914] he verified his former conclusion, and added that in the last stage of asphyxia there is increased pressure on the pulmonary artery and lessened pressure in the systemic vessels. He thinks[915] that when both sides of the heart contain blood, there is paralysis of vaso-motor nerves and the arteries.
The TRACHEA is usually bright red and often contains bloody froth. The LARYNX or trachea as well as PHARYNX or ŒSOPHAGUS may contain a foreign body. If the latter has been removed the resulting irritation may be seen. The LUNGS are sometimes congested, at others normal; color red or pale. Sometimes one lung only is affected. They may be emphysematous. Mackenzie found them congested in all of thirteen cases examined by him. The lungs of young persons may be found comparatively small, almost bloodless, and emphysematous. Tardieu, Albi, and others believed that the punctiform subpleural ecchymoses indicated suffocation, and were due to small hemorrhages from engorged vessels which ruptured in the efforts at expiration. These spots are usually round, dark, from the size of a pin-head to a small lentil, and well defined. They are not like the petechiæ in the lungs and heart after purpura, cholera, eruptive fevers, etc., nor like the hemorrhages under the scalp after tedious labor, all of which are variable in size. These punctiform spots are usually seen at the root, base, and lower margin of the lungs. Hofmann states (“Lehrbuch”) that they are found in the posterior part of the lungs and in the fissures between the lobes. They are indisputably frequent after death from suffocation, and if well marked either in adults or infants that have breathed, they indicate suffocation, unless some other cause of death is clear. Simon, Ogston, and Tidy, however, have shown that they are sometimes absent in fatal suffocation, and are sometimes present in the absence of suffocation, as after hanging and drowning; in fœtuses before labor has begun; often in still-births, although some of these are probably due to suffocation from inhaling fluid or from pressure. Also in death from scarlet fever, heart disease, apoplexy, pneumonia, and pulmonary œdema. Grosclaude[916] quotes from Pinard, who declares that these ecchymoses are found in fœtuses which die from arrest of circulation. Grosclaude himself made a large number of experiments on animals by drowning, hanging, and strangling, and fracturing the skull. The ecchymoses were found in nearly all the cases.
The ecchymoses are partly the result of venous stasis, which overcomes the resistance of some capillaries; and the latter rupture, partly from the aspirating action of the thoracic wall, the lung being unable to fill itself with air, but mainly[917] from vaso-motor contraction and lateral pressure at the maximum of the asphyxia, the time of tetanic expiration. If the asphyxia is interrupted before this stage, the spots do not appear. Similar ecchymoses may be found under the scalp, in the tympanum, retina, nose, epiglottis, larynx, trachea, thymus, pericardium, in the parietal pleura, along the intercostal vessels, rarely the peritoneum, in the stomach, and sometimes the intestines; and in other parts of the body, especially the face, base of neck, and front of chest; in convulsive affections, as eclampsia and epilepsy, and in the convulsions of strychnia and prussic acid poisoning there may be suffusion and congestion of the lungs though not the punctated spots.
Mackenzie, in thirteen cases of suffocation from various causes, failed to find the Tardieu spots either externally or internally. Briand and Chaudé[918] state that they are less constant and characteristic in those who have been buried in pulverulent substances.
Ogston[919] holds that in infants that are smothered the ecchymoses are found in greater number in the thymus gland; while in adults dying from other forms of asphyxia they were found only once in that gland. The spots are found in clusters in infants that are smothered, but only single and scattered in adults who die from drowning, hanging or disease. They were wanting in the lungs of but one infant.
They may be recognized as long as the lung tissue is unchanged. The apoplectic spots in the lungs seen in strangulation are not found in suffocation.
Tardieu[920] from experiments on animals and examination of twenty-three new-born infants who showed traces of violence around the mouth, found the lungs rather pale and anæmic, subpleural ecchymoses well marked. All the deaths were rapid. In cases of compression of chest and abdomen[921] the congestion of the lungs was extensive, and pulmonary apoplexy frequent; more so than in other forms of suffocation. He gave strychnia to animals which died in convulsions, and found very irregular and partial congestions, generally not marked because death was so prompt; blood always fluid; no subpleural ecchymoses.
The LIVER, SPLEEN, and KIDNEYS are generally congested; the kidney more than the other organs named. The spleen is said to be often anæmic. Semen has sometimes been found, unexpelled, in the urethra.