Thenar Measurement Site
The shunting of blood to vital organs during hypovolemia is a well-recognized physiologic phenomenon.1 It follows that the ideal measurement site of StO2 in trauma patients would be a sensitive indicator of oxygenation in peripheral muscle.
After studying the viability of several potential anatomic sites, Hutchinson Technology found the thenar eminence to be the optimal solution. Not only is the thenar eminence easily accessible, it provides consistent results between patients.
1 Thorén O. Blood flow patterns of the forearm of critically ill post-traumatic patients. A plethysmographic study, Acta Chir Scand Suppl. 1974;443:1-59.