Cho Sungkyu, Park Chan Hun, Shin Heean, Lim Jae Hong, Sohn Suk Ho, Kim Ji Seong, Choi Jae Woong, Lee Jung Chan, Kim Woong-Han, Hwang Ho Young
Department of Thoracic and Cardiovascular Surgery, Seoul National University Hospital, Seoul, Seoul National University College of Medicine, Seoul, South Korea.
Interdiscplinary Program in Bioengineering, Seoul National University Graduate School, Seoul, South Korea.
Interdiscip Cardiovasc Thorac Surg. 2023 Jul 19;37(1). doi: 10.1093/icvts/ivad121.
This study evaluated suture tie-down forces and cyclic contractile forces (CCFs) after undersized tricuspid annuloplasty using a hybrid band.
Downsized tricuspid annuloplasty was planned in adult male sheep using 8 force transducers attached from the septal to the anterior annular areas of the ring (segments 1 and 2, flexible septal; segments 3 and 4, semi-rigid posterior; segments 5 and 6, semi-rigid anterior; segments 7 and 8, flexible anterior). CCFs were analysed at 3 different levels of peak right ventricular pressure (RVP): 30, 50 and 70 mmHg.
Eight 5-year-old male Corriedale sheep (average body weight = 66.8 kg) were used. The average suture tie-down force was 4.42 [standard deviation (SD): 2.32] N. When the forces were compared, it was lowest in the flexible anterior area and highest in the flexible septal area (P < 0.001). With the RVP of 30 mmHg, the average CCFs was lowest at segment 3 [0.07 (SD: 0.07) N] and highest at segment 7 [0.15 (SD: 0.08) N]. The CCFs were 0.12 (SD: 0.1) N, 0.09 (SD: 0.12) N, 0.14 (SD: 0.1) N and 0.13 (SD: 0.09) N in the flexible septal, semi-rigid posterior, semi-rigid anterior and flexible anterior parts, respectively (P = 0.208). As the peak RVP increased to 50 and 70 mmHg, the CCFs of each area increased significantly (P < 0.001). Despite this increase, the CCFs remained low (0.1 and 0.3 N), and differences in CCFs between segments and between annular areas showed similar patterns.
The flexible end of the hybrid band reduces the CCFs and might prevent annular tears after ring tricuspid annuloplasty, and the risk of tear would be low even in the septal area.
本研究评估了使用混合带进行尺寸过小的三尖瓣环成形术后的缝线固定力和周期性收缩力（CCFs）。
计划在成年雄性绵羊中进行尺寸缩小的三尖瓣环成形术，使用8个力传感器从环的间隔区连接到前环区（第1和2段，柔性间隔区；第3和4段，半刚性后区；第5和6段，半刚性前区；第7和8段，柔性前区）。在3个不同的右心室压力（RVP）峰值水平：30、50和70 mmHg下分析CCFs。
使用了8只5岁的雄性考力代绵羊（平均体重 = 66.8 kg）。平均缝线固定力为4.42 [标准差（SD）：2.32] N。比较各部位的力时，柔性前区最低，柔性间隔区最高（P < 0.001）。当RVP为30 mmHg时，第3段的平均CCFs最低[0.07（SD：0.07）N]，第7段最高[0.15（SD：0.08）N]。柔性间隔区、半刚性后区、半刚性前区和柔性前区的CCFs分别为0.12（SD：0.1）N、0.09（SD：0.12）N、0.14（SD：0.
