Arterial patterns on wall and floor in conjunction with large accumulation of blood from victim with malfunctioning arterial venous shunt. There are cases where the victim has sustained arterial injury inflicted while down on a surface such as a bed, carpet, floor, or ground where the subsequent expelling of blood forms a pool or saturation stain. Typical arterial spurting or gushing patterns are not present. It is important to attend the autopsy or examine the autopsy report to correlate the presence of arterial patterns with evidence of a damaged artery. The presence of arterial bloodstain patterns indicates arterial damage, but their absence does not preclude arterial damage from having occurred. Arterial bloodstain patterns have also been the result of therapeutic misadventure such as a malfunctioning arterial/venous shunt.
Fig.1 Arterial patterns on walls and floor.
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