In the examination of a body in a case of apparent death from cold, the limbs and internal organs may be found frozen. It must be remembered that this occurs after, not before, death; and the frozen condition must not be mistaken for “rigor mortis.”
In cases where a body is found, in freezing conditions of atmosphere, showing commencing putrefaction, the death must not be hastily attributed to cold, which prevents putrefaction. It is evident that if cold was the cause of death the temperature of the body had been raised since that event, or, more probably, death occurred from other causes and the body remained some time before becoming frozen.
The finding of a body in the snow or frozen in severe weather must not preclude the search for other causes of death, such as apoplexy, etc., which may have occurred anterior to the freezing.
Observers generally have agreed upon the presence of certain post-mortem conditions in cases of death from cold.
Externally.—Upon the skin are found dusky reddish patches, irregular in outline, which are in sharp contrast with the general pallor of the surface. Krajewskey,[691] Ogston,[692] Dieberg,[693] and others, in the several series of cases reported by them, all describe this condition. The skin otherwise is pale.
Internally.—The viscera, including the brain, are congested. The heart contains a large quantity of blood in the cavities of both sides, and the large vessels leading from it are also full. The color of the blood is a bright red, resembling its arterial hue. This condition has been generally noted and described; but some excellent observers have not referred to it.
EFFECTS OF EXTREME HEAT.
The application of moderate heat to the surface of the body causes dilatation of the cutaneous capillaries. In such application the exhalant and perspiratory function of the skin is increased, by which means a rise in general body temperature is prevented. If, however, severe physical exertion accompany the exposure, a more pronounced result is induced and a depressing effect upon the nervous system becomes manifest. If the degree of heat be raised and the exertion increased and prolonged, marked depression ensues. Under circumstances of quiet and rest a high degree of temperature is borne by man without depression or discomfort, but with continued and severe muscular effort the rise in animal temperature is productive of distress and depressing conditions. In the Turkish or Russian baths, in the healthy subject, a temperature of 48.8° to 54.4° C. (120° to 130° F.) produces profuse perspiration but no depression, and a plunge in or affusion of cold water is not only borne with impunity but is acceptable. In conditions of heat accompanied by physical exhaustion, such sudden exposure to cold would prove extremely dangerous.
In the condition of rest, exposed to external heat, the tendency to elevation of body temperature arises from the external causes alone, which in no way specially modify the nutritive functions. But in the second condition the internal processes of nutrition, which have been subject to great stimulation, are suddenly embarrassed by suppression of the compensating activity of the cutaneous surface, and severe organic and nervous derangements follow.