Chapter 7 - Laser doppler

Question 1

Laser doppler principle

Answer 1

1) uses optic/light waves
2) do not penetrate more than a few mm
3) photos scattered and can generate doppler shift
4) photodetector converts optic signal to electronic signal

Question 2

Laser doppler technique

Answer 2

inflate cuff to get volume indicator to < 0.1% = skin perfusion pressure

Question 3

Interpretation of laser doppler results

Answer 3

Skin perfusion > 40 mmHg = likely to heal
SSP 30-40 mmHg = marginal heal
SSP < 30 mmHg = unlikely to heal

Question 4

Benefit of laser doppler

Answer 4

1) determine healing potential of wound, ulcer, amputation level
2) can use in presence of calcium or edema

Question 5

Limitation of laser doppler

Answer 5

1) cannot do over ulcer
2) patient has to not move
3) not widely available