Stabsarzt Dr. S. Rascher
Stabsarzt Dr. E. Finke
I. Problem of the Experiment
Up to the present time there has been no basis for the treatment of shipwrecked persons who have been exposed for long periods of time to low-water temperatures. These uncertainties extended to the possible physical and pharmacological methods of attack. It was not clear, for example, whether those who had been rescued should be warmed quickly or slowly. According to the current instructions for treating frozen people, a slow warming up seemed to be indicated. Certain theoretical considerations could be adduced for a slow warming. Well-founded suggestions were missing for a promising medicinal therapy.
All these uncertainties rested in the last analysis upon the absence of well-founded concepts concerning the cause of death by cold in human beings. In the meantime, in order to clarify this question, a series of animal experiments were started. And, indeed, these officials who wished to make definite suggestions to the doctors in the sea-rescue service had to assume a great deal of responsibility if it came to a question of convincing and consistent results in these animal experiments. At this particular point it is especially difficult to carry the findings in animals over into the human field. In the warm-blooded, one finds a varied degree of development in the heat-regulating mechanism. Besides this, the processes in the skin of the pelted animals cannot be carried over to man.
II. General Procedure of the Experiment
The effect of water temperatures of 2°, 3°, to 12° C. [34°, 37°, to 54° F.] were investigated. A tank 2×2×2 m. [6-2/3×6-2/3×6-2/3 ft.] served as an experimental basin. The water temperature was attained by addition of ice, and remained constant during the experiment. The experimental subjects were generally dressed in equipment such as the flier wears, consisting of underclothing, uniform, a one piece summer or winter protective suit, helmet, and aviators fur-lined boots. In addition they wore a life preserver of rubber or kapok. The effect of additional protective clothing against water-cold was tested in a special series of experiments, and in another series the cooling of the unclothed person was studied.
The bodily warmth was measured thermoelectrically. Following preliminary experiments in which gastric temperatures were measured by a thermic sound, we adopted the procedure of continuously registering rectally the body temperature [Kerntemperatur]. Parallel with this, the recording of the skin temperature was undertaken. The point of measurement was the skin of the back at the level of the fifth thoracic certebral process. The thermoelectrical measurements were controlled before, during, and after the experiments by thermometric tests of the cheek and rectal temperature.
In severe cooling, checking of the pulse is difficult. The pulse becomes weaker, the musculature become stiff, and shivering sets in. Auscultation during the experiment by means of a tube stethoscope fastened over the tip of the heart proved effective. The tubes were led out of the uniform and made possible the continuous listening to the heart during the stay in the water.
Electrocardiographic controls were not possible in the water. After removal from the water they were possible only in those cases in which, a too severe muscle shivering did not disturb the electrocardiograph records.