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False Positive Ductus Venosus A Wave Reversel – ONEMinute Learning

Welcome to ONEMinute learning show, the aim of the show is to learn something new while having a cup of coffee.
Let’s learn something new directly from our Mentor in just one minute. I’m your host Khushboo and today’s topic is how can we avoid false-positive ductus venosus a-wave reversal, on Doppler ultrasound the flow of ductus venosus shows triphasic waveform. Where in the normal physiological situation flow should always be in a forward direction that is towards the fetal heart triphasic waveform comprises with S, A, and A wave Have you triphasic waveform comprises with s, d, and a wave Have you ever come across a situation where you are getting a a-wave reversal and wondering how can I avoid such situation?

False Positive Ductus Venosus A Wave Reversal


We can do that by understanding the bright Peak sign, the ductus venosus is too close to the IVC, and when the sample ductus venosus is too close to the IVC and when the sample box collects Information from both the ductus venosus and IVC. We will get the bright wave reversal from the IVC falling on the ductus venosus and appear as a false positive sign. Look at this Doppler the ductus venosus waveform is gray in color and the superimposed IVC waveform is bright in color. So the normal wave reversal of the IVC appears as a wave reversal of the ductus venosus.
So by comparing the signals, we can avoid a false-positive diagnosis of ductus venosus a-wave reversal.

We can do that by understanding the bright Peak sign, the ductus venosus is too close to the IVC, and when the sample ductus venosus is too close to the IVC and when the sample box collects Information from both the ductus venosus and IVC. We will get the bright wave reversal from the IVC falling on the ductus venosus and appear as a false positive sign. Look at this Doppler the ductus venosus waveform is gray in color and the superimposed IVC waveform is bright in color. So the normal wave reversal of the IVC appears as a wave reversal of the ductus venosus.
So by comparing the signals, we can avoid a false-positive diagnosis of ductus venosus a-wave reversal.

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