# EVAR vs Open Repair > EVAR versus open repair for NEET-SS Vascular Surgery: EVAR-1 fifteen-year lessons, endoleak types and lifelong surveillance after stent grafting. - Canonical URL: https://prepelephant.com/topics/neet-ss/vascular-surgery/evar-vs-open - Exam / course: NEET-SS · Subject: Vascular Surgery - Publisher: PrepElephant (https://prepelephant.com) — Prepared and reviewed by the PrepElephant Academic Review Team - First published: 2026-10-02 - Last updated: 2026-10-02 - How to cite: "EVAR vs Open Repair", PrepElephant, https://prepelephant.com/topics/neet-ss/vascular-surgery/evar-vs-open ## Direct answer Endovascular aneurysm repair excludes the aneurysm from within using a stent graft introduced through the femoral arteries, and it demands specific anatomy: a proximal neck of roughly 15 mm or more below the renal arteries, neck diameter commonly under about 30 mm, angulation under 60 degrees, and iliac access that accepts the delivery sheath. The randomised story runs in three acts: EVAR-1 showed a clear early mortality advantage (about 1.8% versus 4.3% at 30 days); by 15 years the advantage had evaporated, with aneurysm-related mortality converging and then exceeding the open group after eight years, along with roughly two and a half times more reinterventions; DREAM and OVER tell the same story of early benefit and late attrition. EVAR therefore trades a smoother perioperative course for lifelong imaging surveillance and a reintervention burden the patient must live long enough to accumulate. ## What you must remember - Anatomy is destiny: neck length about 15 mm or more, diameter usually under 30 mm, angulation under 60 degrees, heavy circumferential thrombus or calcification unfavourable, and adequate iliac access vessels. - EVAR-1 15-year follow-up (Lancet 2016): all-cause mortality ultimately equal; aneurysm-related mortality converged and then favoured open repair after eight years, driven by late rupture and reintervention-related deaths. - Endoleak taxonomy: type I (incomplete seal at the neck or iliac landing zone) and type III (component separation or fabric tear) need prompt repair; type II (retrograde lumbar or inferior mesenteric filling) is the commonest and is usually observed; type IV is graft porosity with coagulopathy; type V is endotension — sac growth with no demonstrable leak. - Intervention for type II endoleak is reserved for sac expansion — often quoted as growth of 5–10 mm — since most remain stable or thrombose spontaneously. - Surveillance typically pairs CT angiography early (around one month and one year) with annual ultrasound if the sac is stable; patients are never discharged from surveillance. - Fenestrated and branched grafts extend endovascular repair to juxtarenal and thoracoabdominal aneurysms in patients unfit for open surgery. - Ruptured aneurysms can be treated endovascularly in selected anatomy under dedicated protocols, with outcomes comparable to open repair in randomised experience. ## Reasoning it out: two patients, one aneurysm A 76-year-old with two previous laparotomies and a hostile abdomen holds obvious appeal for EVAR — until the CT shows an 8 mm neck angulated at 70 degrees. Anatomy vetoes the technology, and she is left choosing between open repair and fenestrated grafting if her fitness allows either. Contrast a 60-year-old marathon runner with a 25 mm straight neck and good iliacs: EVAR would have him home in days, but he has 25 more years to accumulate surveillance CT scans, endoleaks and reinterventions, while open repair offers durable exclusion in one admission. The reasoning is that EVAR's benefit is front-loaded into the perioperative weeks and open repair's advantage accrues late — so life expectancy, anatomy and fitness each get a vote, in that order. This framing, spoken in a viva, is worth more than reciting trial acronyms. ## Where students slip Endoleak patterns are recited but not applied. The examiner gives a vignette: contrast outside the graft at the neck on the completion angiogram — type I — back to theatre or an extension cuff, never observation. Six months later the same patient's sac grows with delayed filling from a lumbar artery — type II — observe unless expansion continues. The second slip is presenting EVAR as a cure; the honest sentence is that EVAR converts a one-off operation into a lifelong graft-clinic relationship, and the third is forgetting that EVAR-1's late excess was aneurysm-related — rupture of the excluded sac among patients lost to surveillance. Non-attendance is itself a complication. ## Frequently asked questions ### What anatomic criteria must be met for standard EVAR? A proximal neck of roughly 15 mm or more below the renal arteries, diameter commonly under 30 mm, angulation under 60 degrees with limited thrombus, plus iliac vessels accepting the delivery sheath. ### How is a type II endoleak managed? Mostly by observation with imaging surveillance; intervention — embolisation or translumbar sac puncture — is reserved for sac expansion, commonly quoted as 5–10 mm of growth. ### Why did EVAR-1's early advantage disappear? Because late aneurysm-related deaths from rupture and reinterventions accumulated in the endovascular group after about eight years, equalising overall survival. ### What surveillance follows EVAR? Imaging for life — typically CT angiography around one month and one year, then annual ultrasound if the sac is stable, with reintervention for endoleak, sac growth or limb occlusion. ### What is endotension? Persistent sac expansion after endovascular repair without a demonstrable endoleak on standard imaging, managed after excluding occult leaks by observation or, if growth continues, operative exploration. ### When is open repair preferred to EVAR? Young fit patients valuing durability, anatomy hostile to graft fixation, infective aneurysms, and anyone unable to comply with lifelong surveillance.