Suture tie-down forces and cyclic contractile forces after an undersized tricuspid annuloplasty using a 3-dimensional rigid ring in an ovine model

Abstract OBJECTIVES This study was conducted to measure suture tie-down forces and evaluate cyclic contractile (CCFs) in beating hearts after undersized 3-dimensional (3D) rigid-ring tricuspid valve annuloplasty (TAP). METHODS Eight force transducers were attached the 3D rigid TAP ring. Segments 1 8 from mid-septal anterior-septal commissural area a counterclockwise order. Two-sizes-down ring TAPs performed 6 sheep. Tie-down CCF recorded analysed at annular segments 3 levels of peak right ventricular pressure (RVP: 30, 50 70 mmHg). RESULTS The overall average 4.34 ± 2.26 newtons (N) 0.23 0.09 N, respectively. an RVP 30 mmHg higher areas (segments 3, 5 8) than other segments. increases following changes statistically significant only (P = 0.012). However, mean CCFs remained low all positions (ranges 0.06–0.46 N). CONCLUSIONS risk dehiscence down-sized might be minimal because absolute even condition high RVP. careful suturing septal commissures is necessary prevent tear during TAP.