Small-dose Low-concentration And Hypobaric Ropivacaine For Combined Spinal-epidural Anesthesia In Knee Arthroscopy

Objective To analyze the clinical feasibility and effectiveness of small-dose、low-concentration and hypobaric ropivacaine for combined spinal-epidural anesthesia inknee arthroscopy.Methods Sixty patients undergoing knee arthroscopy, aged from18-65, weighted from45-75Kilograms, graded by American Anesthesia Association (ASA) in class Ⅰor classⅡ, were randomized and averaged into two groups (n=30), the small-dose group and thenormal-dose group. The small-dose group received spinal anesthesia with0.75%ropivacaine1ml+Saline2ml, while the normal-dose group received0.75%ropivacaine2ml+Saline1ml. The block effects, hemodynamic changes, the first urinating time afteroperation, and the side effects such as hypotension、bradycardia、shiver、nausea andvomiting in48hours were observed.Results In contrast with normal-dose group, small-dose group have steadierhemodynamics, faster blocking recovery, shorter first urinating time after operation, andlower side effects.Conclusion Small-dose low-concentration and hypobaric ropivacaine for combinedspinal-epidural anesthesia can be safely and effectively used in knee arthroscopy.