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.
Franco Accorsi, MD
Member of the Order of Physician of Bologna n° 6728
I am a specialist in Medical Angiology and I am based in Bologna, Italy. Until 2008 (voluntary resignation) I worked at Maggiore Hospital in Bologna as "Dirigente Medico" in the Department of Internal Medicine and as Angiologist in the Angiology Unit with a position of "Alta Professionalità" in "Vascular Ecography and Angiology".
I am currently working in Bologna as an independent professional in the areas of angiology and vascular diagnostics.
I have been a speaker at national and international courses/congress and I have taught duplex ultrasound method in GIUV and SIUMB courses at the Maggiore Hospital, Bologna and courses of echocolor Doppler of extracranial and intracranial arteries at the Stroke Unit of S. Maria Nuova Hospital, Reggio Emilia.