Background To compare the early and late postoperative outcomes of chordal reconstruction (CR) and quadrangular resection (QR) in patients with posterior mitral valve prolapse (PMPL). Methods Between January 2008 and December 2018, 305 patients with PMPL who underwent mitral valve plasty (MVP) were included in this retrospective analysis. The CR and QR procedures were performed in 169 patients (CR group) and 136 patients (QR group), respectively. Early and late postoperative outcomes were compared between the groups. Results Follow-up was complete in 96.4% (294/305) of patients, with a mean follow-up of 81.2 ± 30.4 months. No 30-day mortality was observed in any of the patients. The success rate of the mitral valve repair was similar in both groups (99.4% vs. 98.5%, P = 0.850). The incidence of early postoperative hemolysis was lower in the CR group than in the QR group (0.00% vs. 3.0%, P = 0.024). Postoperative left ventricular end-diastolic diameter (LVEDD) decreased more significantly in the CR group than in the QR group at 3 months (8.15 [1.30,12.65] vs. 3.25 [− 0.05, 8.75] mm, P < 0.001). During follow-up, the overall survival rates were 95.1% and 94.6% in the CR and QR groups, respectively. The incidence of reoperation for moderate or severe mitral regurgitation (MR) was similar in both groups (4.3% vs.5.4%, P = 0.653), but the time interval between the initial operation and reoperation was shorter in the QR group than in the CR group (84.3 ± 36.1 vs. 120.9 ± 27.6 months, P = 0.026). The LVEDD enlargement was more significant in the QR group than in the CR group (4.5 [3.6, 4.5] vs. 2.4 [1.3, 2.8] mm, P < 0.001). Conclusion CR and QR are effective techniques for patients with PMPL. Both techniques resulted in a low incidence of recurrent MR. However, CR can reduce early postoperative hemolysis and LVEDD more significantly. During the long-term follow-up, reoperations due to recurrent MR were performed at a longer interval after the initial operation. LVEDD expansion was better avoided in the CR group.

Background: To compare the early and late postoperative outcomes of chordal reconstruction (CR) and quadrangular resection (QR) in patients with posterior mitral valve prolapse (PMPL).Methods: Between January 2008 and December 2018, 305 patients with PMPL who underwent mitral valve plasty (MVP) were included in this retrospective analysis. The CR procedure was used in 169 patients (CR group), and the QR procedure was used in 136 patients (QR group). Early and late postoperative outcomes were compared between the groups. Results: Follow-up was complete in 96.4% (294/305) of patients, with a mean follow-up of 81.2±30.4 months. No 30-day mortality was observed in any of the patients. The success rate of the mitral valve repair was similar in both groups (99.4% vs. 98.5%, p=0.850). The incidence of early postoperative hemolysis was lower in the CR group than that in the QR group (0.00% vs. 3.0%, p=0.024). Postoperative left ventricular end-diastolic diameter (LVEDD) decreased more significantly in the CR group than in the QR group at 3 months (8.15 [1.30,12.65] vs. 3.25 [-0.05, 8.75] mm, p<0.001). During follow-up, the overall survival rates were 95.1% and 94.6%, respectively. The incidence of reoperation for moderate or severe mitral regurgitation (MR) was similar in both groups (4.3% vs.5.4%, p=0.653), but the time interval between the initial operation and reoperation was shorter in the QR group than in the CR group (84.3±36.1 vs. 120.9±27.6 months, p=0.026). The LVEDD enlargement was more significant in the QR group than in the CR group (4.5 [3.6, 4.5] vs. 2.4 [1.3, 2.8] mm, p<0.001). Conclusions: CR and QR are effective techniques for patients with PMPL. Both techniques resulted in a low incidence of recurrent MR. However, CR can reduce early postoperative hemolysis and LVEDD more significantly. During the long-term follow-up, reoperations due to recurrent MR were performed at a longer interval after the initial operation. LVEDD expansion was better avoided in the CR group.

In order to simplify the method of human-computer interaction, through the analysis and research of the motion capture system and the robot arm system, a motion imitation platform based on the Marker ball motion capture system combined with the six-axis robot arm was built. The collected coordinate data is obtained through the inverse kinematics solution of the robot to obtain the joint Angle data of the manipulator, and the trajectory of the joint Angle is smoothed by MATLAB simulation software.The simulation was carried out based on the RoBoDK simulation environment. The simulation experiment results showed that the motion reduplication method could be applied to the imitation of human arm movements by the robot arm, and the motion accuracy could meet the working requirements, and the motion imitation effect was good.