On-X弁による大動脈弁置換術

Aortic Valve Replacement with the On-X Valve

On-X弁（On-X Life Technologies社）を用いた大動脈弁置換術（AVR）の良好な成績が報告されている1～6）．われわれはOn-X弁によるAVRを4例に施行し，最長15年の経過観察をしえたので報告する．

This is 4-case report of aortic valve replacement （AVR） with an On-X valve （On-X Life Technologies）. Case 1 （64-year-old male） underwent AVR （23-mm valve） and mitral valve replacement, and 2 years later was diagnosed refractory pyogenic spondylitis from a traffic accident. Case 2 （57-year-old male） and Case 3 （59-year-old male） received a 21-mm valve. Case 3 had cerebellar hemorrhage without any abnormal neurological deficits in 11 years after AVR. Case 4 （65-year-old female） was implanted with a 19-mm valve. All cases have been doing well in New York Heart Association （NYHA） functional class Ⅰ or Ⅱ without any thromboembolic or major hemorrhagic events for 15, 13, 12, and 9 years, respectively. Their On-X valve performance by echocardiography were similar to those in “On-X instructions for use” and other reports and have been maintained during the follow-up period. The On-X valve demonstrated good long-term results, although further study is needed.