Miscellaneous Non-imaging Testing

Question 1

This test is for wound healing and amputation level determination

Answer 1

Transcutaneous oximetry or TcP02

Question 2

With TcP02, an electrode heats the skin to ____ degrees C. To increase blood flow and melts the ____ layer in fatty tissue, then allows more ___ to escape through skin and measured by sensor in electrode.

Answer 2

Skins heated to 45 degrees C (113 F)
Melts the LIPID layer
Allows 02 to escape through skin

Question 3

The chemical reaction that occurs in the electrolyte solution (located between skin and electrode surface) is converted to a “current” reading which is ?

Answer 3

Converted to a p02 reading in mmHg

Question 4

The technique for TcP02 is:

1. After cleansing skin with alcohol wipe and air dried, we place a ______ on skin
2. A few drops of ______ is put inside ring and attach the _____
3. Reference reading (upper Lat. chest) is obtained first, followed by specific sites (e.g. Near toes, BK, AK)
4. After manual calibration, it takes about _____ minutes per site to obtain p02

Answer 4

1. An airtight self-adhesive FIXATION RING placed on skin
2. Drops of ELECTROLYTE SOLUTION put in ring and attach ELECTRODE/SENSOR
3. Takes about 15-20 minutes per site

Question 5

A p02 reading of > 50 mmHg suggests ____
< 40 to < 50 mmHg suggests ____
< 30 mmHg suggests ____

Answer 5

A p02 reading of > 50 mmHg suggests HEALING should occur
< 40 to < 50 mmHg suggests BORDERLINE HEALING
< 30 mmHg suggests NON-HEALING (number also varies)

Question 6

Laser Doppler has similar capabilities, limitations, and patient positioning as

Answer 6

TcP02

Question 7

With laser Doppler, a _____ cable delivers a low-power light beam to the _____ beds of the skin and illuminates a sample volume of tissue

Answer 7

FIBER-OPTIC cable

Delivered to the CAPILLARY beds of the skin

Question 8

The light energy being delivered during laser Doppler is scattered by this

Answer 8

Scattered by MOVING red blood cells

Question 9

During laser Doppler, what is the difference between energy effects of moving red blood cells and stationary ones

Answer 9

Energy from moving RBC are DOPPLER-SHIFTED in FREQUENCY, energy from stationary RBC are NOT

Question 10

With laser Doppler, part of the laser light is gathered by a RECEIVING OPTICAL FIBER and returned to the _____

Answer 10

Photodetector

Question 11

In laser Doppler, this is what changes the optical signal to an electronic signal which is analyzed to determine the microvascular blood volume

Answer 11

The photodetector

Question 12

Technique for laser Doppler begins with getting the bilateral BP of the brachials then applying the laser Doppler and cuff to the clean/dry test sites (e.g. Toe, foot) to obtain pulse volume waveform (Cuff inflated to 40mmHg). The next step is to activate _____, inflating the cuff to ____mmHg

Answer 12

Activate the SKIN PERFUSION PRESSURE (SPP)

Question 13

For laser Doppler, what is required in order to have a SPP measured

Answer 13

There needs to be a change of < 0.1% drop in volume

Question 14

With laser Doppler, healing is likely with SPP at _____, marginal healing with SPP at _____, and less likely healing with SPP at ____

Answer 14

Healing = SPP > 40 mmHg
Marginal Healing = SPP between 30-40 mmHg
Less likely healing = SPP < 30 mmHg