Originally Posted by Asher
The study by Williams et al, 2005 (which I have attached previously) got an arm and ankle systolic pressure to calculate the ABI by putting the PPG probe on the digit (finger or toe) and using the pressure cuff in the usual way above the elbow and ankle. So the doppler was not used on the brachial, dorsalis pedis or posterior tibial arteries to determine the systolic pressure.
They mention that they have found no significant difference in measurements between the standard Doppler method and the PPG method.
Does anybody do the ABI this way?
Does anybody know of any literature that has shown that there is no significant difference between the two methods?
I can see that the PPG method would save time and I would think be more repeatable. Can anyone see any problems with it though.
the PPG I use is vey sensitve to body motion and I find the cut off point more ambiguous than doppler sounds. I not sure if this is specific to my equipement or techique but given what is being measured suspect this could be generalised.
I only use PPG because I find using doppler on digits unreliable.
how are you getting on with qualitative interpretation of Doppler and PVR? I find this a very useful way of providing alternative view of effects of compensatory vasodilation and providing cross check against ABPI or TPBIs.
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