The Effect Of Different Doses Of Ropivacaine On Spinal Anesthesia Block Time

objective: To observe the effect of different doses of ropivacaine on spinal anesthesia block time.Method: A total of 200 patients undergoing unilateral lower limb surgery under spinal anesthesia in our hospital from December 2021 to February 2023 were selected.Randomly assigned to four groups: A,B,C,and D.The doses of ropivacaine used were 5 mg in group A,10.0 mg in group B,15 mg in group C,and 20 mg in group D,all with a volume of 2ml.Compare the duration of anesthesia,the onset and recovery time of sensory nerve block,the onset and recovery time of motor nerve block,the degree and time of muscle strength block,and the time of postoperative muscle strength recovery among the four groups.Results:The duration of anesthesia for the four groups after spinal cord anesthesia was(40(20,90min),(71(30,130min),(100(54,280min),and(133.3(70,270min),respectively.As the dosage of ropivacaine increases,the duration of anesthesia prolongs(P<0.05).Group D has the longest duration;The onset time of sensory nerve block in Group D was faster than that in Group A,Group B and Group C(P<0.05).The onset time of sensory nerve block in group C was faster than that in group A(P<0.05).The onset time of motor nerve block in Group C was faster than that in Group A and Group B(P<0.05),but there was no statistical difference with Group D(P>0.05);The motor nerve recovery time of Group C was slower than that of Group A and Group B(P<0.05).Conclusion:1.With the increase of Ropivacaine dose,the duration of spinal anesthesia is prolonged;2.Compared with the other three groups,the 20 mg dose group showed significant blood pressure fluctuations,with fluctuations not exceeding 20% of the baseline value.