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Abdominal aortic aneurysm neck morphology: proposed classification system.

C O McDonnell¹, M Halak, A Bartlett

¹Dept of Vascular Surgery, Sir Charles Gairdner Hospital, Perth, Western Australia. comcdonnell@eircom.net

Irish Journal of Medical Science

|November 1, 2006

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Aneurysm neck shape is a crucial factor in endovascular abdominal aortic aneurysm repair (EVAR) outcomes. Analyzing neck morphology can improve patient results and guide future treatment strategies.

Area of Science:

Vascular Surgery
Medical Imaging
Biomedical Engineering

Background:

Previous research on endovascular abdominal aortic aneurysm repair (EVAR) has focused on neck length, angulation, and width.
Aneurysm neck shape has not been extensively studied in relation to EVAR outcomes.

Purpose of the Study:

To investigate the impact of abdominal aortic aneurysm (AAA) neck morphology on the success of EVAR.
To establish a classification system for AAA neck shapes to aid in preoperative assessment.

Main Methods:

Pre-operative CT scans and graft plans from 70 patients undergoing EVAR were analyzed.
Aneurysm necks were categorized into six distinct shapes: flared, parallel, irregular, conical, barrel, and hourglass.
Study endpoints included mortality, Type I endoleak, and graft migration.

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Main Results:

The most common neck shapes were flared (46%) and parallel (34%).
Irregular, conical, barrel, and hourglass shapes were less frequent (9%, 6%, 3%, and 3%, respectively).
Over a mean follow-up of 20.2 months, there was one Type I endoleak, one graft migration, and no aneurysm-related deaths.

Conclusions:

Aneurysm neck morphology assessment should be a standard part of preoperative planning for EVAR.
Implementing a classification system for AAA neck shapes can enhance surgical planning and potentially improve patient outcomes.