Objective To analyze the effect of ultrasound-guided continuous femoral nerve block on postoperative hemodynamics and hemorheology of senile total knee arthroplasty（TKA）

and to explore its clinical application value.Methods A total of 79 senile patients underwent TKA in our hospital were selected

and they were divided into control group（40 cases）and research group（39 cases）by random number table. Control group received postoperative patient-controlled intravenous analgesia

while research group received ultrasound-guided continuous femoral nerve block. The incidence of adverse reactions during analgesia was recorded. The analgesic effects were evaluated by postoperative visual analogue scale（VAS）on postoperative 4 h

8 h

12 h and 24 h rest state

48 h and 72 h passive motion state.At the time of connection of analgesia device（T0）

after connection for 12 h（T1） and after connection for 48 h（T2）

the hemodynamics indexes and hemorheological indexes were detected and recorded.ResultsAt each time after surgery under rest sate or passive motion state

the VAS scores of research group were lower than those of control group

the differences were statistically significan（tall P<0.05）.At each time（T0

T1

T2）after surgery

there was no statistical difference in the blood oxygen saturation and mean arterial pressure between the two groups.There was no statistical difference in the heart rate between the two groups at T0

the levels ofheart rate in the two groups at T1 and T2 were higher than those at T0

but the increased range of research group was lower than that of control group（P<0.05）.There was no statistical difference in the levels of hemorheological indexes between the two groups at T0.The plasma viscosity

whole blood high-shear viscosity and whole blood low-shear viscosity in control group at T1 and T2 were higher than those in research group

and the differences were statistically significan（tall P<0.05）.Conclusion Ultrasoundguided continuous femoral nerve block in senile TKA has better analgesic effects

it can stabilize hemodynamics

has less effect on hemorheology

achieve less adverse reactions.It is of great value to enhance surgical effects and promote postoperative recovery.