[Pattern of experimentally-induced subcutaneous hematoma]

Healthy persons were each injected with 1 ml autoblood into the subcutis of the inner upper arm. Following this, different objects were applied to each haematoma area and kept pressed on the area for one hour by means of a sphygmomanometer cuff (30 mm Hg), to establish whether this would lead to secondary shape or pattern changes of the haematoma. When the haematomata were compressed by shaped objects, there developed patterned blanched areas or intensity differences, respectively, becoming more marked in the course of several days in the living experimental persons. In corpses greater quantities of blood were injected (10 ml) and higher contact pressures applied (up to 180 mm Hg). In some cases a markedly delimited imprint reflecting the configuration of the object became discernible already one hour post injectionem.