title: Morphometry and classification in abdominal aortic aneurysms: patient selection for endovascular and open surgery.
abstract: OBJECTIVE
  To evaluate the anatomic morphology of abdominal aortic aneurysms (AAAs) and compose a classification system to facilitate patient selection for endovascular graft (EVG) repair.
  
  
  METHODS
  Data on 242 consecutive AAA patients evaluated on a nonemergent basis in a 3.5-year period to July 1996 were prospectively entered into a registry. Patients were examined using sequential intravenous spiral computed tomographic angiography and intraarterial digital subtraction angiography. The data collected and analyzed included: diameters of the supra- and infrarenal aorta, aneurysm, aortoiliac bifurcation, and iliac arteries; lengths of the proximal neck, distal cuff, and aneurysm; degrees of iliac artery tortuosity; and occlusion of the visceral, renal, or iliac arteries.
  
  
  RESULTS
  The 242 aneurysms could be easily grouped into three distinctive categories related to the extent of the aneurysmal disease. Type I AAAs (11.2%) had nondilated, thrombus-free infrarenal (15 mm) necks and distal (10 mm) cuffs appropriate for EVG anchoring. In type II and its subgroups (72.3%), a sufficient proximal neck was present, but the aneurysm extended into the iliac arteries; 56% of these were eligible for a bifurcated endograft. In type III (16.5%), a sufficient proximal neck was missing, independent of distal involvement. In all, 51.7% were good EVG candidates based on AAA morphology. Taking into consideration relevant concomitant vascular diseases, proximal iliac kinking, and iliac, renal, or visceral occlusive disease, only 30.2% of the population were potential candidates for an efficient and secure EVG repair using the devices currently available.
  
  
  CONCLUSIONS
  In contrast to classical open repair, detailed preoperative measurements are recommended for EVG planning. The use of liberal EVG indications may lead to a higher incidence of complications, whereas restrictive morphology-based selection criteria may offer excellent results.
authors.affiliation: Department of Surgery, Ruprecht-Karls University of Heidelberg, Germany.
authors.forename: H
authors.initials: H
authors.lastname: Schumacher
authors.forename: H H
authors.initials: HH
authors.lastname: Eckstein
authors.forename: F
authors.initials: F
authors.lastname: Kallinowski
authors.forename: J R
authors.initials: JR
authors.lastname: Allenberg
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D015901:Angiography, Digital Subtraction; D017130:Angioplasty / Q000379:methods*; D017544:Aortic Aneurysm, Abdominal / Q000000981:diagnostic imaging* / Q000601:surgery; D001027:Aortography; D005260:Female; D006801:Humans; D017543:Iliac Aneurysm / Q000000981:diagnostic imaging / Q000601:surgery; D008297:Male; D008875:Middle Aged; D018579:Patient Selection; D011446:Prospective Studies; D012078:Renal Artery Obstruction / Q000000981:diagnostic imaging / Q000601:surgery; D014057:Tomography, X-Ray Computed