Fenestrated and Branched EVAR in Singapore

Fenestrated EVAR and branched EVAR are endovascular treatments for selected complex aortic aneurysms. They allow a graft to extend across the level of important arteries while keeping blood flowing to organs such as the kidneys and intestines. They are more complex than standard abdominal EVAR and need detailed imaging, a suitable device and an experienced multidisciplinary aortic team.

Why might a standard stent graft be unsuitable?

An aortic graft needs an effective seal against an appropriate segment of artery. Some aneurysms begin very close to the kidney arteries, involve their origins, or extend through the chest and abdomen. Simply covering these branches with a standard graft could interrupt vital blood flow. Complex endovascular designs address this problem in selected anatomy.

The aortic disease guide explains aneurysms and the decision to repair. Even when a complex graft is technically possible, surveillance or open repair may be more appropriate after weighing the untreated risk, operative risk, durability and your priorities.

What do the different terms mean?

Fenestrated EVAR: fEVAR

A fenestration is a carefully positioned opening in the graft fabric. It aligns with a branch artery so blood can reach that organ. Connecting stents are commonly used to maintain the route between the aortic graft and the target artery. The openings and the patient's arteries need to match accurately.

Branched EVAR: bEVAR

A branched graft has dedicated connections that are joined to the organ arteries with bridging stent grafts. This arrangement may be useful when more extensive aneurysm disease leaves space between the main graft and the branch origins. A repair can use fenestrations, branches or a combination; these labels describe the graft design, not a guaranteed level of safety.

Custom-manufactured and standard-design devices

A custom-manufactured graft is made to a plan based on a person's scans. Custom manufacture is not a separate operation: a custom device may contain fenestrations, branches or both. Planning, manufacture and delivery take time, so the team must consider whether waiting is safe.

Some standard-design branched devices can be used without individual manufacture if the anatomy fits. They still require careful selection. Device availability, local authorisation and the team's experience need confirmation. Physician modification of a graft is a different approach from manufacturer production and is not assumed to be an available routine option here.

What does assessment and treatment involve?

CT planning examines the entire affected aorta, access arteries and each organ artery. Kidney function, heart and lung health, previous aortic surgery, frailty and medicines are reviewed. The team also considers inherited aortic disorders, which may change the suitability of endovascular treatment.

The graft and its branch connections are introduced through arterial access under imaging guidance. Additional access sites and a longer or staged procedure may be required. For extensive thoracoabdominal disease, staging and measures to protect spinal-cord circulation are considered. The agreed plan should explain which arteries will be incorporated and whether another stage is expected.

Patients should understand what would happen if access, sealing or a branch connection proved inadequate. Alternatives can include a different endovascular design, open surgery, a combined approach or non-operative management. An emergency may remove the option of waiting for a custom device.

What risks require particular discussion?

Alongside bleeding, infection, access injury, heart or lung complications and death, complex repair introduces risks related to the organ branches. Narrowing or blockage of a kidney artery can cause kidney injury or dialysis. Loss of bowel blood supply can be life-threatening and require further surgery. Extensive aortic coverage can cause spinal-cord injury with weakness or paralysis; stroke is another serious risk.

Endoleaks, branch-stent problems, graft movement, aneurysm growth and later reintervention remain possible. A less invasive access route does not mean a minor procedure. Ask for an explanation of your individual risks and the consequences of choosing each alternative.

How is recovery different?

Recovery depends on the extent and urgency of treatment, kidney and neurological function, and whether treatment is staged. Some patients need intensive monitoring or rehabilitation. Instructions on medicines, activity and return to work must be individualised.

Long-term surveillance checks the aneurysm, main graft and each incorporated artery. Additional imaging or procedures may be needed even without symptoms. Use the aortic awareness guide to keep track of the plan and warning signs.

Common questions

Is a custom graft always better?

No. It is one way to match a design to anatomy. Waiting time, suitability, durability, available alternatives and overall health matter more than the label.

Is there a video explaining the basic principle?

The EVAR video introduces a stent graft inside the aorta. It explains the foundation, rather than all the additional steps and risks of a complex repair. Dr Choong's aortic publications and book chapters provide further background to his academic work.

Discuss a complex aortic second opinion

For a planned consultation at Mount Elizabeth Novena Specialist Centre, contact Andrew Choong Vascular Surgery. Bring complete scan images, reports and previous operation records. Sudden severe chest, back or abdominal pain, collapse or new weakness needs emergency care: call 995 in Singapore.