Laser Doppler Flashcards
Laser Doppler is similar to what other test
TcPO2
laser light is reflected back from RBC’s
Laser Doppler is similar to what other test
TcPO2
laser light is reflected back from RBC’s
a _________ delivers low -power light beam to the capillary beds of the skin
fiber - optic cable
Light energy is ________ by RBC’s
scattered
the photo detector changes the optical signal into an electronic signal which is analyzed to determine the microvascular ______ _______.
blood volume
VPR are obtained using principles of what
plethysmography
describe procedure for laser Doppler
6
Bilateral brachial BP recorded
test sites cleaned with alcohol wipe
laser Doppler and cuff applied
PVR waveforms obtained with cuff inflated
40 mmHg
skin perfusion pressure (SPP) mode activated
100 mmHg
the cuff pressure is held
what % drop should be seen in vol indicator for SPP measurement
if
pt leg is elevated untill the specific vol drop occurs
this is how the SSP is obtained
Interpretation
Norm:
VPR eval is same as PPG for digits
SPP > 40 mmHg healing likely
SPP 30-40 mmHg marginal healing
Abnorm:
VPR in poor quality
SPP < 30 mmHg less likely to heal
a _________ delivers low -power light beam to the capillary beds of the skin
fiber - optic cable
Light energy is ________ by RBC’s
scattered
the photo detector changes the optical signal into an electronic signal which is analyzed to determine the microvascular ______ _______.
blood volume
VPR are obtained using principles of what
plethysmography
describe procedure for laser Doppler
6
Bilateral brachial BP recorded
test sites cleaned with alcohol wipe
laser Doppler and cuff applied
PVR waveforms obtained with cuff inflated
40 mmHg
skin perfusion pressure (SPP) mode activated
100 mmHg
the cuff pressure is held
