Fig. 1

Comparison of hemodynamic indexes in the three groups (\(\overline{x}\) ±s). Note: A shows the comparison of MAP levels at different time points in the three groups. The abscissa is the T0, T1, and T2 time points, and the ordinate is the MAP level, mmHg. The MAP levels at T0, T1, and T2 for patients in the low concentration group were (81.88 ± 6.88) mmHg, (87.55 ± 9.12) mmHg and (88.32 ± 10.04) mmHg, respectively. The MAP levels at T0, T1, and T2 of patients in the medium concentration group were (81.72 ± 6.89) mmHg, (82.88 ± 7.02) mmHg and (83.27 ± 8.21) mmHg, respectively. The MAP levels at T0, T1, and T2 in the high concentration group of patients were (81.75 ± 6.91) mmHg, (92.77 ± 9.51) mmHg and (98.05 ± 11.35) mmHg, respectively. * indicates a significant difference in MAP levels at T1 among the three groups (t = 2.992, P < 0.05). ** indicates a significant difference in MAP levels between the three groups at T2 (t = 3.801, P < 0.05). B shows the comparison of HR levels in the three groups at different time points. The abscissa is the T0, T1, and T2 time points, and the ordinate is the HR level, times/min. The HR levels at T0, T1, and T2 for patients in the low concentration group were (88.33 ± 10.19) beats/min, (85.24 ± 8.31) beats/min and (86.31 ± 10.24) beats/min, respectively. The HR levels at T0, T1, and T2 of patients in the medium concentration group were (88.34 ± 9.27) beats/min, (77.57 ± 4.21) beats/min and (80.33 ± 9.47) beats/min, respectively. The HR levels at T0, T1 and T2 in patients of the high concentration group were (86.31 ± 10.24) beats/min, (81.27 ± 5.09) beats/min and (96.42 ± 11.27) beats/min, respectively. *** indicates a significant difference in the HR levels at T1 among the three groups (t = 3.269, P < 0.05). # indicates a significant difference in the HR levels at T2 among the three groups (t = 3.991, P < 0.05)