Wikis > Peripheral Vascular Disease > Vascular Assessment > Non-invasive Investigations > Doppler Signal
Doppler Signal:
Doppler probe placed over artery with use of gel – character of sound is considered
Normally – sharp and high pitched hissing sound during systole – should be triphasic or biphasic; second sound(s) is backward flow during diastole; small vessels may only be monophasic as too small for backward flow
Sounds become higher pitched when blood flow is greater eg narrowed vessel.
Print out:
Steeper the waveform, the faster the blood flow.
Normal pattern is triphasic.
Limitation – Doppler signal cannot reliably penetrate atherosclerotic plaques
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