Ultrasound Evaluation of Pseudoaneurysms and A-V Fistulas

The echocolor Doppler technique is useful for identifying the pseudoaneurysms and the arteriovenous fistulas.

The ultrasound evaluation of the pseudoaneurysm allows to identify the size of the pseudoaneurysm and of the communicating channel: spectral waveforms in the communicating channel demonstrate “to-and fro” flow (forward flow in systole and complete reversal of flow in diastole).

The arteriovenous fistula is an abnormal communication between an artery and a vein.

The ultrasound evaluation is useful for identifying the level of the abnormal vascular communication and the flow disturbances produced by the communication: the spreading of color pixels into the extraluminal soft tissues, the high diastolic flow in the arterial waveform proximal to the fistula, the decreased flow in the artery caudal to the fistula and the arterialized waveform in the draining vein.

This lesson describes the echocolor Doppler characteristics of the  pseudoaneurysms and the arteriovenous fistulas.

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