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Buerger's test
Buerger's test is used in an assessment of arterial sufficiency. The ''vascular angle'', which is also called ''Buerger's angle'', is the angle to which the leg has to be raised before it becomes pale. In a limb with a normal circulation the toes and sole of the foot, stay pink, even when the limb is raised by 90 degrees. In an ischaemic leg, elevation to 15 degrees or 30 degrees for 30 to 60 seconds may cause pallor. (This part of the test checks for ''elevation pallor''.) A vascular angle of less than 20 degrees indicates severe ischaemia.〔Browse's introduction to the symptoms and signs of surgical disease/4th edtition/International student edtition/Page 175〕
From a sitting position, in normal circulation, the foot will quickly return to a pink colour. Where there is peripheral artery disease the leg will revert to the pink colour more slowly than normal and also pass through the normal pinkness to a red-range colouring (''rubor'' - redness) often known as ''sunset foot''. This is due to the dilatation of the arterioles in an attempt to rid the metabolic waste that has built up in a reactive hyperaemia. Finally the foot will return to its normal colour. This part of the test is known as a check for ''rubor of dependency''.
== See also ==
*Peripheral vascular examination
*Claudication
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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