Question | Answer |
What are the capabilities of laser doppler? | 1.Determine healing potential of wound/ulcer and amputation level
2. Used in presence of calcific arteries and edema
3. Evaluate pedal artery flow in diabetics
4. Beneficial in angiosome-guided testing |
What does SPP stand for? | Skin perfusion pressure |
What do photons do? | Scatter random directions by both cell types |
What does laser doppler used to assess? | Characteristics of microvascular blood volume in capillary beds of the skin |
What type of waves does laser doppler use? | |
What are the 2 types of cells use by photons? | Red blood cells
Station at cells |
What are Photons? | Light energy |
7 | |
What does a photodetector? | Converts optical signal into electrical signal that processes it to determine microvascular blood vokume |
| Pulse volume recording
Volume pulse recording |
What does SPP stand for? | Skin Perfusion Pressure |
What is the prep for SPP? | Obtain brachial pressure.
Wipe site with alcohol prep.
Place cuff and doppler. |
What is the likely and marginal healing pressures for skin perfusion? | >40 mmhg likely to heal
30-40 mmhg marginally to heal |
What is the technique for laser doppler? | 1. Pulse volume waveforms rec.
2. Skin perfusion pressure mode & cuff inflates 100mmhg
3. Pressure held 10 sec, watch volume drop to 0.1%
4. If no drop, increase to 20 mmhg
5.repeat til volume drops
6. SPP obtained and Slow deflate 10mmhg every 5 sec |
How do you obtain a patient's SPP? | 1.Tech sees steady baseline
2.followed by doubling/more of graphs pressure scale
3.patients actual pressure,confirmed by increasing size change of bars on scale during deflation |
What are the abnormal pressure for skin perfusion? | Dampened or diminished waveforms
SPP of <30mmhg less likely to heal |