| Comparison of Motor Block of 1.0% Ropivacaine and 0.5% Bupivacaine in Epidural Anesthesia for Hip Arthroplasty Surgery. |
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Kyung Hoon Kim, Tae Hong Kim, Chul Hong Kim, Jae Young Kwon, Kuen Tak Suh, Kyoo Sub Chung |
1Department of Anesthesiology, College of Medicine, Pusan National University, Busan, Korea. dolgo@chollian.net
2Department of Orthopedic Surgery, College of Medicine, Pusan National University, Busan, Korea. |
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| Abstract |
BACKGROUND
The purpose of this study was to compare the onset time, degree and duration of motor block, and the satisfaction of surgeons of given single epidural injections of 1.0% ropivacaine and 0.5% bupivacaine in patients undergoing hip arthroplasty surgery.
METHODS
In a double-blind randomized study involving 20 patients, patients randomly received 12 ml of 1.0% ropivacaine or 0.5% bupivacaine at the L2 - 3 or L3 - 4 interspace. Parameters measured were the onset time, duration and degree of motor block, and the satisfaction of the surgeons.
RESULTS
Mean onset time of Bromage scale 2 was significantly slower with 1% ropivacaine (14.6 +/- 1.3 min) than with 0.5% bupivacaine (15.7 +/- 2.0 min). However, each frequency of motor blockade (Bromage scale 1, 2 and 3) with 1.0% ropivacaine (10, 8 and 7) was greater than that seen with 0.5% bupivacaine (7, 6 and 1). For scales 1 and 2, 1.0% ropivacaine had a significantly longer duration than 0.5% bupivacaine and the overall duration of motor blockade with 1.0% ropivacaine was longer than 0.5% bupivacaine.
Motor block was in 80% achieved satisfactorily of the ropivacaine group and 60% of the bupivacaine group by the surgeons.
CONCLUSIONS
In conclusion this study demonstrated that 1.0% ropivacaine provides a more rapid onset time, greater degree and longer duration of motor block without unacceptable side effects than 0.5% bupivacaine for hip arthroplasty surgery. From these results, it may suggest that 1.0% ropivacaine may be useful for lower extremity orthopedic surgery requiring good muscle relaxation. |
| Key Words:
Bupivacaine; epidural anesthesia; hip arthroplasty; ropivacaine |
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