What is confusing is -- why does the monophasic waveform of a diseased peripheral artery (ie. unidirectional flow through the cardiac cycle) at 1:44 look so similar to the low resistance waveform shown on the next slide at 1:52? In the former situation, loss of reversal of flow means you are going to a high resistance state (a stenosed artery that loses its elasticity), but in the latter situation it signifies a low resistance downstream organ (ie blood can come and go freely). Is there a way to distinguish one from the other? Meaning, if imaging findings aren't clearly suggestive, how do you know if a waveform's loss of reversal of flow is due to increased arterial disease or a low resistance downstream organ?
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What is confusing is -- why does the monophasic waveform of a diseased peripheral artery (ie. unidirectional flow through the cardiac cycle) at 1:44 look so similar to the low resistance waveform shown on the next slide at 1:52?
In the former situation, loss of reversal of flow means you are going to a high resistance state (a stenosed artery that loses its elasticity), but in the latter situation it signifies a low resistance downstream organ (ie blood can come and go freely). Is there a way to distinguish one from the other? Meaning, if imaging findings aren't clearly suggestive, how do you know if a waveform's loss of reversal of flow is due to increased arterial disease or a low resistance downstream organ?