Journal of Chest Surgery

The Korean Society for Thoracic and Cardiovascular Surgery (대한심장혈관흉부외과학회)
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Mitral Valvuloplasty using New Mitral Strip (Mitracon^{(R)}$)

새로운 Strip (Mitracon^{(R)}$)을 이용한 승모판막 성형술

  • Kang, Seong-Sik (Department of Cardiothoracic Surgery, Eulji University Hospital, College of Medicine, Eulji University) ;
  • Kim, Sang-Pil (Department of Cardiothoracic Surgery, Eulji University Hospital, College of Medicine, Eulji University) ;
  • Song, Meong-Gum (Department of Thoracic and Cardiovascular Surgery, College of Medicine, Konkuk University)
  • 강성식 (을지대학교 의과대학 을지대학병원 흉부외과학교실) ;
  • 김상필 (을지대학교 의과대학 을지대학병원 흉부외과학교실) ;
  • 송명근 (건국대학교 의과대학 흉부외과학교실)
  • Published : 2008.06.05
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Abstract

Background: Numerous surgical devices for mitral repair have been used in the past with good results. In this study we describe a simple annuloplasty technique with using a new device ($Mitracon^{(R)}$). The aim of this study was to assess its efficacy and surgical results with using $Mitracon^{(R)}$. Material and Method: From May 2003 to October 2005, 46 patients (21 women and 25 men (mean age of $51.4{\pm}17.8$ years) with mitral regurgitation from various causes were treated with either the $Mitracon^{(R)}$ (the $Mitracon^{(R)}$ group) or the Capentier Edward rigid ring (the CE group). The median follow-up duration was 18.9 months. Result: The mean grade of mitral regurgitation before and immediately after surgery in the $Mitracon^{(R)}$ group and the CE group decreased from $3.2{\pm}0.8$ to $0.6{\pm}0.7$ and $3.4{\pm}0.7$ to $0.3{\pm}0.5$, respectively. There were no significant changes in the ejection fraction either between the two groups or before and immediately after surgery. No deaths were seen in either group. Early postoperative echocardiography of all 46 patients showed only trivial mitral regurgitation or none at all. Echocardiography at a median of 18.9 months also showed no progression in mitral regurgitation. The mean grade of mitral regurgitation in the $Mitracon^{(R)}$ group at this time point decreased from $3.2{\pm}0.8$ to $0.8{\pm}0.7$ (p<0.05). The CE group also showed a similar degree of decrease from $3.4{\pm}0.7$ to $0.3{\pm}0.6$ (p<0.05). The mitral valve area in the $Mitracon^{(R)}$ group at 1 year follow-up was $3.3{\pm}0.9cm^2$. The mitral valve area in the CE group was $2.7{\pm}0.6cm^2$. The mean mitral pressure gradient in the $Mitracon^{(R)}$ group at 1 year follow-up was $3.1{\pm}1.3$ mmHg. The mean pressure gradient in the CE group was $4.5{\pm}2.1$ mmHg, although any statistical significant difference for this between the groups was not reached. Conclusion: The present study showed the described technique to be safe and effective in the intermediate term. Because long term results are unavailable, a more extensive prospective randomized multicenter trial may be warranted to determine whether this procedure should be generally applied for repair of mitral valve disease.

배경: 현재 승모판막 폐쇄부전증 치료로 사용되는 판막 링은 여러 가지가 있으나 각각 단점이 있다. 이런 단점들을 보안한 $Mitracon^{(R)}$ (ScienCity Co., Seoul, Korea)은 부드러운 재질의 C자형 strip으로써 승모판막 전엽의 움직임을 억제하지 않고, 후판막륜의 확장을 교정하고, 대동맥판막의 움직임에 영향을 미치지 않는 목적-으로 개발 제작되었다. 본 연구의 목적은 $Mitracon^{(R)}$을 사용하여 다양한 병인의 승모판막 폐쇄부전증 환자에게 시술하고 그 성적을 비교 평가함으로써 임상적 효용성을 알아보기 위함이다. 대상 및 방법 2003년 5월부터 2005년 10월까지 46명의 환자에서 한명의 외과의사에게 승모판막 성형술을 시행 받은 환자들을 연구 대상으로 후향적으로 조사하였다. 환자 선택을 $Mitracon^{(R)}$을 이용하여 수술한 $Mitracon^{(R)}$군(23명)과 Carpentier-Edwards ring (Edwards lifesciences, Irvine, USA, CE ring)을 이용하여 수술한 CE군(23명)으로 나누어 무작위 선발하였다. 남자가 25명, 여자가 21명이었으며 평균 연령은 $51.4{\pm}17.8$ ($Mitracon^{(R)}$군 $49.2{\pm}18.2$, CE군 $53.5{\pm}17.3$)세였다. 현재 임상 성적이 많이 보고된 CE ring과 새로운 $Mitracon^{(R)}$을 비교 분석하였다. 추적검사로는 심초음파 검사를 수술전, 수술 후 $7{\sim}10$일(immediate), 수술 후 6개월, 수술 후 1년, 그 이후는 1년에 1회 시행하였다. 심초음파 검사 항목 중 심구혈률(EF), 승모판막 페쇄부전 정도(MR grade), 승모판막 면적(MVA), 좌심실말기 수축기 용적(LVESV), 좌심실 말기 이완기 용적(LVEDV), 승모판막 평균 전후 압력차(Mean PG) 등을 비교 분석하였다. 추적관찰 기간의 중간 값은 18.9개월이었다. 결과: 전 예에서 링 분리(dehiscence) 등의 기구 연관 합병증((device-related complication)과 승모판막의 수축기 전방운동(systolic anterior motion, SAM), 조기사망, 재수술, 혈뇨, 혈전 색전증 등의 발생은 없었으며, 46명의 환자 전원에서 수술 중 시행한 경식도 초음파에서 승모판막 폐쇄부전은 완전 교정되었다. 수술 후 퇴원하기 전 시행한 심초음파(echocardiography) 검사 결과, 46명의 환자 전 예에서 승모판막 폐쇄부전 정도의 평균이 1 이하로 교정되었다. 수술 직후 승모판막 폐쇄부전의 정도는 $Mitracon^{(R)}$군 $0.6{\pm}0.7$, CE군 $0.3{\pm}0.5$ (p=0.24)이었다. 수술 1년 후 승모판막 폐쇄부전의 정도는 $Mitracon^{(R)}$군 $0.8{\pm}0.7$, CE군 $0.3{\pm}0.6$ (p=0.02)이었다. 심초음파 검사의 승모판막 폐쇄부전의 정도는 두 군간 통계적으로는 유의한 차이를 보였으나 두 모두 승모판막 폐쇄부전의 정도의 평균이 1이 되지 않았고 임상적 증상정도는 동일하였다. 수술 1년 후 승모판막의 면적은 $Mitracon^{(R)}$군 $3.3{\pm}0.9cm^2$, CE군 $2.7{\pm}0.6cm^2$ (p=0.04) 통계적으로 유의한 차이를 보였다. 수술 1년 후 승모판막의 판막 전후 평균 압력차는 $Mitracon^{(R)}$군 $3.1{\pm}1.3$ mmHg, CE군 $4.5{\pm}2.1$ mmHg (p=0.16)로 통계적으로 유의하지 않았으나 $Mitracon^{(R)}$군이 작았다. 결론: 다양한 판막 병변에 의한 승모판막 폐쇄부전증을 치료하기 위하여 적용된 $Mitracon^{(R)}$(ScienCity Co., Seoul, Korea)은 Carpentier-Edwards ring) (Edwards lifesciences, Irvine, USA)과 비교하여 생존율과 심초음파 추적검사에서 판막폐쇄부전을 교정하고 판막 전후 평균 압력 차는 통계적 유의성에서 동등하였으며, 협착을 야기하지 않고 판막면적을 유지시키는 면에서는 우월한 성적을 나타내었다. 향후 장기 추적 검사와 다기관 공동 연구가 필요하다고 사료된다.

Keywords

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