This is a pilot study investigating a new concept of intra-procedural percutaneous duplex ultrasound (DUS) volume flow-guided balloon angioplasty for the quantification and optimization of endovascular treatment outcomes of dysfunctional autologous arteriovenous fistulae (AVF).
This is a prospective, single-center, single-arm clinical trial introducing a new functional index of clinical success of endovascular treatment and investigating the feasibility of volume flow-guided balloon angioplasty of dysfunctional AVF assessed with intraprocedural percutaneous DUS. The study will include consecutive patients undergoing fluoroscopically-guided percutaneous balloon angioplasty due to dysfunctional AVF in the investigator's center. Exclusion criteria will be: (i) not available volume flow values at the time of AVF maturation, (ii) patients with arteriovenous synthetic grafts. Patients' demographical data, dialysis access history, and procedural details will be recorded. Intraprocedural volume flow measurements will be obtained just prior to the procedure and after each balloon dilation. Volume flow measurements will be correlated with digital subtraction angiography quantitative vessel analysis (QVA) performed by an independent investigator blinded to the volume flow analysis outcomes. Follow up DUS imaging including volume-flow assessment will be set at 24h, 6, and 12 months after the index procedure, while fistulograms with QVA analysis will be performed at 6 and 12 months. All DUS measurements will be performed using the same imaging protocol and the same operator. The study's primary endpoints will be (i) the quantification of angioplasty outcome using sequential DUS volume flow analysis following each balloon catheter dilation and (ii) to assess the correlation between volume flow and clinical success defined as high-quality dialysis for a period of at least one month. Secondary endpoints will be (i) re-intervention-free interval defined as the time interval between endovascular treatment and reintervention due to dysfunction recurrence of the treated AVF and (ii) correlation between volume flow and QVA measurements.
Study Type
INTERVENTIONAL
Allocation
NA
Purpose
DIAGNOSTIC
Masking
NONE
Enrollment
20
Volume flow measurements using DUS will be obtained at the end of each balloon dilation, at 24 hours, 6 months, and one year after index procedure.
"Attikon" University General Hospital
Athens, Attica, Greece
Medifil SA Hemodialysis Centre
Athens, Attica, Greece
Nefrologiki SA Hemodialysis Centre
Athens, Attica, Greece
Quantification of angioplasty outcome
The quantification of angioplasty outcomes will be performed using sequential DUS volume flow analysis
Time frame: At the end of the procedure
Duplex Ultrasound volume flow values achieved following angioplasty and clinical success
The investigators will use ROC analysis to define a cut off value of volume flow increase (ml per minute) at the end of the procedure to predict clinical success.
Time frame: 1 month
Re-intervention-free interval
The time interval between endovascular treatment and reintervention due to dysfunction recurrence of the treated AVF
Time frame: 6 months
Comparison of Duplex Ultrasound volume flow values with digital subtraction angiography QVA measurements.
To assess wheather a significant volume flow decrease of \>50% measured by Duplex ultrasound indicates an analougously significant late lumen loss (mm) of the target lesion measured with QVA analysis of digital subtracted venography
Time frame: 6 months
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