Physician-Modified Endografts for Complex Aortic Aneurysms and Thoracoabdominal Aneurysm Repair in High-Risk Patients

Summary

This single-arm FDA-monitored protocol intends to broaden endovascular device applicability using physician-modifications in patients who A) Have anatomical conditions not amenable to endovascular repair using currently marketed grafts in the United States. B) Are at high risk for open surgical repair. C) Are high-risk subjects with previously placed endovascular devices and have developed failure of their previous devices. The use of physician-modified endografts aims to shift the seal zone proximally above the celiac artery in order to treat their complex or thoracoabdominal aneurysms in a minimally invasive fashion. These patients are considered too high risk to survive open surgical repair and do not meet anatomic criteria for the Gore Thoracoabdominal Multi Branch Endoprosthesis, which is currently the only FDA approved device in the US to treat these aneurysms.

The primary objective is to evaluate safety and effective of physician modified endografts in the treatment of thorax-abdominal aneurysms and complex aortic aneurysms. For primary safety endpoints, mortality and major adverse events (MAE) will be analyzed at 30 days or in hospitalization (if this exceeds 30 days). Primary endpoints include the following: 1. Mortality related to primary aortic disease 2. Aneurysm rupture 3. All cause mortality

For primary effectiveness endpoints, treatment success will be analyzed as the proportion of patients to achieve treatment success at 12 months. Treatment success is defined by a composite endpoint, which includes all of the following criteria: Technical success (defined as successful delivery and deployment of the physician modified endograft with perseveration of those branch vessels intended to be preserved, freedom from type I or type III endoleak, freedom from stent graft migration, freedom from aneurysm enlargement \>5mm, freedom from aneurysm rupture or conversion to open repair.

Secondary objectives of the study include assessment of individual safety and effectiveness endpoints as follows: technical success, procedure success, mortality, major adverse events - specifically renal, cardia, pulmonary, gastrointestinal, and neurologic. Each endpoint will be analyzed separately. Secondary endpoints will be individually analyzed at 4-8 weeks, 6 months, and annually at 1,2,3,4, and 5 years.

Secondary endpoints to be analyzed are the following: 1. Evidence of Aortic Disease Progression: Monitoring for aneurysm growth \> 5 mm from baseline measurements. 2. Device Failure: Evaluation of device performance, including migration \> 10 mm, device degradation, and loss of device integrity. 3. Endoleaks: Monitoring for the occurrence and classification of endoleaks as outlined in the clinical outcome definitions. 4. Secondary Interventions: Description and analysis of secondary interventions aimed at treating branch vessel stenosis, occlusion, or embolization. 5. Significant Lifestyle-Limiting or Disabling Complications: Assessment and reporting of complications resulting in significant impairment of daily life, such as stroke-induced paralysis (paraplegia). 6. Cardiac Dysfunction: Monitoring and analysis of cardiac events, including myocardial infarction, congestive heart failure, and cardiac ischemia requiring intervention. 7. Renal Events: Evaluation of renal complications, including the need for dialysis, deterioration of renal function, and renal failure. 8. Mesenteric Events: Description and classification of mesenteric complications, such as ischemia and the need for surgical resection. 9. Respiratory Events: Monitoring for respiratory complications, including respiratory failure and prolonged intubation

Secondary endpoints will be individually analyzed at 4-8 weeks, 6 months, and annually at 1,2,3,4, and 5 years

Conditions

• Abdominal Aortic Aneurysms
• Thoracoabdominal Aneurysms
• Pararenal Aortic Aneurysm

Interventions

DEVICE

Physician Modified Endograft

The Zenith Alpha and TX2 grafts are tubular grafts made of polyester fabric sewn to stainless steel stents that keep the graft open. The graft will be opened under sterile conditions and modifications for fenestrations or branches will be created based on the patient's specific anatomy. The graft will be inserted through arteries in the leg (called endovascular repair). This procedure uses catheters that go inside the blood vessel to place a stent graft above and below the aneurysm. The graft includes 1 to 5 small holes (fenestrations) or cuffs (side branches). The arteries to the liver, intestine, and kidneys will be have a stent (small tubular stainless steel structures) to help keep the arteries open and aligned with the fenestrations or branches.

Sponsors & Collaborators

• Baylor College of Medicine

  collaborator OTHER

• Steven Maximus

  lead OTHER

Principal Investigators

• Steven Maximus, MD · Baylor College of Medicine

Study Design

Allocation

NA

Purpose

TREATMENT

Masking

NONE

Model

SINGLE_GROUP

Eligibility

Min Age

18 Years

Sex

ALL

Healthy Volunteers

No

Timeline & Regulatory

Start

2025-09-01

Primary Completion

2026-09-01

Completion

2030-09-01

FDA Device

Yes

Countries

• United States

Study Locations