Objective:By observing the changes of P-V loop in capacity shock intervention Under Goal-directed Hemodynamic Management in patients undergoing total knee replacement, we investigate the effect of capacity shock on cardiac contractility and work in order to seek a more effective target plan of capacity shock for intraoperative patients.~Methods:20 patients with total knee replacement were enrolled in this study. Capacity shock therapy was used in Group A(n=10) and conventional strategy was used in Group B (n=10). V(t) was measured and calculated using TEE and P(t) was acquired by the analysis of patients'radial artery pressure waveform. We set five time points of parameter acquisition: after grouping (T1), the first shock completion(T2), the second shock completion (T3), 1h after shock treatment (T4), and operation completion(T5). We make up the P-V loop fitting P(t) and V(t) at each time point after the calibration of cardiac cycle.
By observing the changes of P-V loop in capacity shock intervention Under Goal-directed Hemodynamic Management in patients undergoing total knee replacement, we investigate the effect of capacity shock on cardiac contractility and work in order to seek a more effective target plan of capacity shock for intraoperative patients.