LDF and SPP

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Last updated 8:20 PM on 3/15/26
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8 Terms

1
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laser doppler flowmetry (LDF)

  • non-invasive technique measuring real-time blood perfusion in mcrocirculation

  • uses low-power laser - doppler shift created by moving RBCs


2
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skin perfusion pressure (SPP)

  • blood pressure at which microcirculatory flow returns after occlusion

  • not affected by arterial calcification

  • useful in pts with diabetes


3
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clinical applications of SPP:

  • predicting wound healing potential

  • selecting amputation level based on perfusion

  • diagnosing PAD/CLI when ABI is unreliable


4
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an SPP value of >40 mmHg indicates:

high healing probability

5
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an SPP value of 30-40 mmHg indicates:

  • grey zone

  • requires further evaluation


6
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an SPP value of < 30 mmHg indicates:

  • critical ischemia

  • revascularization often needed


7
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advantages of SPP:

  • non-invasive

  • reproducible

  • effective for non-compressible arteries


8
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limitations of SPP:

sensitive to motion, temperature and tissue condition