LAUSR

Introduction: Failure at the proximal neck for endovascular aortic repair (EVAR) in abdominal aortic aneurysm (AAA) is more common in the presence of unfavorable proximal neck anatomy. In patients with hostile neck, EndoAnchors provide proximal fixation and reduces potential type I endoleak or endograft migration. However, the population size for AAA patients with hostile anatomic neck among Korean is unknown and cost-analysis with regard to EndoAnchors has not been established. Methods: To figure out the population size of AAA patients with hostile neck anatomy, retrospective medical chart review was conducted from four major medical centers. Hostile proximal aortic neck was defined as any or all of neck length 28 mm, infrarenal neck angulation >60°, ≥50 percent of circumferential thrombus, ≥50 percent of calcified neck, and conical neck. Cost-analysis on EndoAnchor use for treatment purpose was conducted based on Korean National Health Insurance Claims dataset (HIRA-NIS 2015). Results: Two-hundred and ten patients’ anatomic data treated with EVAR were included; 130 (61.9 percent) patients met the criteria for a hostile aortic neck and 32 (15.2 percent) patients had multiple hostile anatomy parameters. Endograft migration was reported in four (1.9 percent) patients and intra or post-op type I endoleak was reported in 21 (10.0 percent) patients. Based on 1-year claims data, 1,607 patients were treated with EVAR in 2015 and the annual average medical costs for open repair were USD 16,151. Given the patients with type I endoleak or endograft migration needs open repair if not treated with EndoAnchors, the estimated annual costs for patients treated with EndoAnchor were USD 2,234,321 and those for patients without EndoAnchor were USD 2,595,508, therefore USD 361,187 can be saved annually. Conclusions: The population size with hostile aortic neck in Korea was comparable with those in western countries. Economically, EndoAnchor is a cost-saving treatment for type I endoleak and migration after EVAR from Korean payer.