Endovascular Treatment for Delayed Type Ib Endoleak with Hostile Arterial Anatomy After Endovascular Abdominal Aortic Aneurysm Repair
Endovascular abdominal aortic aneurysm repair (EVAR) has emerged as a primary treatment option for abdominal aortic aneurysms (AAAs) due to its minimally invasive nature and reduced perioperative morbidity compared to open surgery. However, EVAR is associated with a higher risk of reintervention, particularly due to complications such as endoleaks. Among these, type Ib endoleak, which occurs due to inadequate sealing at the distal attachment site of the stent-graft, poses significant challenges, especially in patients with hostile arterial anatomy. This article presents a detailed case study of a 71-year-old male patient who developed a delayed type Ib endoleak after EVAR and discusses the technical challenges and strategies employed to manage this complication.
The patient had undergone EVAR 17 months prior to presentation using Zenith stent-grafts (Cook Inc, Bloomington, IN, USA) to treat a right common iliac artery (CIA) aneurysm with a diameter of 4.4 cm. Postoperative follow-up at 8 months revealed no evidence of endoleak, and the stent-graft appeared well-positioned. However, at 17 months post-EVAR, computed tomographic angiography (CTA) revealed a newly developed type Ib endoleak at the left iliac limb. The patient was asymptomatic, and vital signs were stable. The presence of a type Ib endoleak necessitated reintervention to prevent aneurysm sac enlargement and potential rupture.
Initial attempts to access the left iliac limb via the left femoral artery were unsuccessful due to severe calcific stenosis and tortuosity of the external iliac artery (EIA). Consequently, a left axillary artery puncture was performed. A guidewire was advanced into the main body and left limb of the stent-graft and captured using a snare through the left femoral artery. However, attempts to insert a stent-graft into the distal end of the preexisting stent-graft failed. Angiography revealed that the guidewire had passed through a tiny space between the stent and graft, exiting into the iliac artery lumen.
To address this issue, a Zenith stent-graft with a diameter of 12 mm was deployed in the EIA to reduce tortuosity. This maneuver allowed the guidewire to successfully traverse the preexisting stent-graft and reach the proximal aorta. Finally, an additional 12 mm stent-graft was deployed to seal the type Ib endoleak. Postoperative CTA on the 7th day confirmed the absence of endoleak, and the patient was discharged without complications.
This case highlights several critical aspects of managing delayed type Ib endoleaks, particularly in patients with hostile arterial anatomy. Type Ib endoleaks are often associated with unfavorable anatomical features, such as large CIA diameter, heavy calcification, or severe aortoiliac tortuosity. These factors complicate reintervention and necessitate innovative approaches to ensure successful treatment. In this case, the use of a double approach—combining femoral and axillary access—and the deployment of a stent-graft to correct EIA tortuosity were instrumental in achieving a favorable outcome.
The case also underscores the importance of intermittent angiography during endovascular procedures. Despite the smooth passage of the guidewire through the preexisting stent-graft, it inadvertently penetrated the stent-graft, leading to an unexpected complication. This emphasizes the need for continuous imaging guidance to minimize misreadings and prevent procedural complications.
Delayed type Ib endoleaks are relatively rare but require vigilant follow-up after EVAR. Persistent monitoring is essential to detect and address complications promptly. The risk of reintervention highlights the need for careful patient selection and thorough preoperative planning, particularly in patients with hostile anatomy. Additionally, the use of advanced imaging techniques, such as CTA, is crucial for accurate diagnosis and treatment planning.
In conclusion, the management of delayed type Ib endoleaks in patients with hostile arterial anatomy presents significant technical challenges. However, with appropriate strategies, such as the use of a double approach and corrective stenting, successful outcomes can be achieved. Intermittent angiography during procedures is essential to minimize complications and ensure accurate device placement. Persistent follow-up after EVAR is critical to detect and manage complications such as type Ib endoleaks, thereby reducing the risk of aneurysm sac enlargement and rupture.
doi.org/10.1097/CM9.0000000000001784
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