Transcutaneous oxygen tension TcPo

This measurement is a non-invasive method for monitoring arterial oxygen tension and reflects local arterial perfusion pressure. A heated oxygen sensitive probe is placed on the dorsum of the foot. Normal TcPo, is greater than 40 mmHg. A level below 30 mmHg indicates severe ischaemia and indicates the need for further vascular assessment such as non-invasive angiography. However, levels can be falsely lowered by oedema and cellulitis.

Values in the foot can also be compared with those on the chest wall to derive a regional perfusion index, which is independent of fluctuations in systemic oxygen delivery, although commonly, the absolute pressure on the dorsum of the foot is used.

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