Pre-emptive Coil Embolization in Endovascular Aortic Repair (PRIZE)

Uppsala University

Status: Not yet enrolling

Conditions: Abdominal Aneurysm; Endoleak; Endovascular Aortic Repair

Treatments: Procedure: EVAR; Device: Concomitant embolization

Study type: Interventional

Funder types: Other

Identifiers

NCT06975215

PRIZE

Details and patient eligibility

About

Abdominal aortic aneurysms are often treated with a minimally invasive procedure called endovascular aortic repair (EVAR). While EVAR is widely used, it can sometimes lead to complications over time, and some patients may require further procedures. One of the main issues is endoleak, which occurs when blood continues to flow into the aneurysm sac after treatment. This often happens because small nearby blood vessels, or other sources, continue to supply blood to the aneurysm.

A potentialy strategy to reduce the risk of endoleak is pre-emptive embolization-a technique used during EVAR to block these sources of persistent blood flow. This can include embolization of side branches, the aneurysm sac, or other contributing vessels. Early findings suggest that pre-emptive embolization may lower the risk of endoleaks, but it is still uncertain whether it improves long-term outcomes.

The PRIZE study (Randomized Controlled Trial on Pre-emptive Coil Embolization in Endovascular Aortic Repair) is designed to answer this question. In this research, patients are randomly assigned to one of two groups: one group will receive EVAR with pre-emptive embolization, and the other will receive EVAR without it.

Two main outcomes will be assessed. The first is aneurysm sac regression at two years, meaning a reduction in the size of the aneurysm sac after treatment. This is important because sac shrinkage after EVAR has been linked to lower overall mortality, even though the exact reasons for this are not yet fully understood. The second main outcome is the rate of aortic-related events over five years, as ensuring the long-term durability of treatment is a key goal of this study. Secondary outcomes, including quality of life, patient satisfaction, and cost-effectiveness will also be evaluated.

Currently, there is no clear agreement on whether pre-emptive embolization should be routinely used during EVAR. In a recent international survey, 76% of aortic specialists agreed that more evidence is needed. The PRIZE study aims to provide that evidence. If pre-emptive embolization proves effective, it could become a standard addition to EVAR, helping to improve both the immediate success and long-term durability of treatment. If not, the study will help avoid unnecessary procedures, ensuring patients receive only treatments that offer real benefits.

Enrollment: 332 estimated patients

Sex: All

Ages: 18+ years old

Volunteers: No Healthy Volunteers

Inclusion criteria

• Abdominal aortic aneurysms with a maximum aortic diameter above the threshold for repair level.
• High-risk criteria for type 2 endoleaks

Exclusion criteria

• Does not fulfill instructions for use for standard EVAR
• Contraindication for EVAR
• Life expectancy less than 2 years

Trial design

Primary purpose: Treatment

Allocation: Randomized

Interventional model: Parallel Assignment

Masking: Single Blind

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332 participants in 2 patient groups

EVAR

Active Comparator group

Description:

EVAR, as per standard of care

Treatment:

Procedure: EVAR

EVAR + embolization

Experimental group

Description:

EVAR, as per standard of care, associated with concomitant embolization

Treatment:

Device: Concomitant embolization

Procedure: EVAR