Early duplex predicts restenosis after renal artery angioplasty and stenting

Abstract

Early renal artery PSV within 1 week after RA-PTAS predicted renal artery restenosis and lower postprocedure renal function. Recurrent stenosis demonstrated no association with absolute elevation in PSV prior to RA-PTAS nor with the change in PSV after RA-PTAS. These data suggest that detectable differences exist in renal artery flow parameters following RA-PTAS that are predictive of restenosis during follow-up but are not apparent on completion arteriography or detectable by intra-arterial pressure measurements. Further study is warranted.

Development of a Duplex Ultrasound Protocol for Baseline and Follow-Up Imaging of a Branched Aortic Endoprosthesis

“…As stated previously, DUS has been used to monitor the patency and function of stents in the celiac, superior mesenteric, and renal arteries. 5,[10][11][12][13][14][15][16][17][18][19] Studies have reported velocity thresholds for stented vessels and described technical standards regarding use of a Doppler angle of 60 degrees or less to detect elevated peak systolic velocities (PSV) and decreased end diastolic velocities (EDV). However, there is little data available for applying velocity criteria to fenestrated and branched stent-grafts, and thus prospective longitudinal studies evaluating DUS velocity values and changes in velocity over time are needed to allow for the development of criteria that would indicate when the stentgraft is patent and function is normal or when intervention may be needed.…”

“…5,[20][21][22][23] Components from published protocols were incorporated into the creation of the TAMBE pre-and postprocedure DUS imaging protocol. 5,7,10,14,15,[17][18][19][20][21][22] The purpose of this study is to describe the DUS protocol for imaging pre-and postplacement of the TAMBE device and show an example of how DUS is able to detect branch vessels at risk for thrombosis in patients with branched and fenestrated endovascular aneurysm repair.…”