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Steps of pressure measurement. After the cannula tip has been inserted to distal end of transverse carpal ligament, catheter is then inserted A : There are two marks, spaced 1 cm, each other, on the catheter. Then the catheter is inserted so that 1 cm passed after the second mark on the catheter B : Pressure is measured after the removal of cannula. Pressure at D3 is measured C : Note the second mark of the catheter (arrow).
