Transcutaneous Oximetry TcP02

Question 1

Capabilities of transcutaneous oximetry:

Answer 1

• wound healing and amputation level determination
• reflects tissue oxygen tension and relies on a balance between oxygen supply and consumption

Question 2

Limitations of transcutaneous oximetry:

Answer 2

• inability to keep electrode fairly flat on the skin surface
• electrode placement must be on intact skin

Question 3

Patient positioning for transcutaneous oximetry:

Answer 3

supine, head slightly elevated; room is warm

Question 4

The electrode heats skin to:

Answer 4

45 degrees celsius

Question 5

What happens when the electrode is increased to 45 degrees celsius?

Answer 5

• blood flow increases
• lipid layer in fatty tissue melts
• more “02” escapes through skin, measured by sensor in electrode

Question 6

As 02 escapes, a chemical reaction occurs where?

Answer 6

in the electrolyte solution, located between skin and electrode surface.

Question 7

Electrode converts chemical reaction to a:

Answer 7

current reading

Question 8

What is a “current” reading converted to?

Answer 8

p02 reading in mmHg

Question 9

Technique used when performing transcutaneous oximetry TcP02?

Answer 9

• skin cleansed with alcohol wipe; air dried
• airtight self-adhesive fixation ring placed on the skin
• few drops of electrolyte solution put inside ring
• electrode/sensor is affixed to fixation ring

Question 10

Normal interpretation:

Answer 10

Healing should occur with a p02 reading of 70-80 mmHg

Question 11

Borderline healing interpertation:

Answer 11

30-40 mmHg

Question 12

Non-healing (poor values) interpertation:

Answer 12

10-15 mmHg

*number can vary