454-158 | Development of a Duplex Ultrasound Protocol for Baseline and Follow-Up Imaging of a Branched Aortic Endoprosthesis-Aggregated blood flow volume in the vertebral arteries did not vary significantly with age.

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Pdf Summary

Researchers have developed a standardized duplex ultrasound (DUS) protocol for baseline and follow-up imaging of a branched aortic endoprosthesis called the Thoracoabdominal Branch Endoprosthesis (TAMBE). This protocol aims to provide reproducible and accurate imaging for individuals who have undergone endovascular repair of their thoracoabdominal aortic aneurysm. DUS is a low-risk and widely available imaging modality that can be used to monitor stent patency and changes in hemodynamics over time.<br /><br />The protocol involves performing DUS imaging after an 8 to 12 hour fast to minimize the presence of bowel gas, which can interfere with imaging. Doppler measurements of peak systolic and end diastolic velocity are made at specific arterial segments in the aorta and the celiac, superior mesenteric, and renal arteries. Pulsed-wave Doppler is used to record spectral Doppler data, and color Doppler is used to ensure proper placement of the Doppler sample volume and correct angle of interrogation.<br /><br />This DUS protocol can complement computed tomography angiography (CTA) imaging for surveillance of individuals who have received the TAMBE device. While CTA is the gold-standard imaging for stent patency, DUS can provide important hemodynamic information and identify qualitative changes in the Doppler waveform that may indicate stent patency or stenosis. DUS is a preferred modality due to its lower cost and absence of radiation exposure and contrast agent use.<br /><br />By adhering to this imaging protocol, sonographers can provide accurate and reproducible DUS examinations. The protocol also has the potential to identify signs of device failure before symptoms or events occur, thus allowing for timely intervention and preventing end-organ damage.

Keywords

duplex ultrasound

DUS protocol

branched aortic endoprosthesis

endovascular repair

stent patency

hemodynamics

Doppler measurements

color Doppler

computed tomography angiography (CTA)

device failure