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Korean J Anesthesiol > Volume 49(6); 2005 > Article
Korean Journal of Anesthesiology 2005;49(6):793-797.
DOI: https://doi.org/10.4097/kjae.2005.49.6.793   
The Effect of Injection Speed of Local Anesthetic on Success Rate of Unilateral Spinal Anesthesia.
Hyun Sook Cho, Youn Suk Son, Kyu Don Chung, Won Hyung Lee, Jong Min Park, Ji Hyun Chung, Sang Mook Lee
1Department of Anesthesiology and Pain Medicine, College of Medicine, The Catholic University of Korea, Seoul, Korea. ismoogi@hanmail.net
2Department of Anesthesiology and Pain Medicine, Chung-Nam National University College of Medicine, Daejeon, Korea.
3Gochang Hospital, Gochang, Korea.
Abstract
BACKGROUND
The relationship between the injection speed of a local anesthetic and the success rate of unilateral spinal anesthesia has been a controversial issue. The aim of this thesis was to identify any significant effects of the drug injection speed on the success rate of unilateral spinal anesthesia.
METHODS
Forty patients were randomly allocated into 2 groups, group R and S. The injection speed was 4 ml/min in group R (n = 20) and 1 ml/min in group S (n = 20). Hyperbaric 0.5% bupivacaine 10 mg was injected via a syringe pump. The drug was administered at the L3-4 intervertebral space with the patient in the lateral decubitus position, which was maintained for 20 minutes after the injection. A spinal sensory block was assessed by examining the temperature sensation using an alcohol-sponge. The motor block was evaluated using the modified Bromage scale and the dependent and non-dependent sides were compared.
RESULTS
Significant differences (P<0.05) were observed in the success rate of unilateral motor paralysis (45% in group R vs 90% in group S). There were no significant blood pressure differences between the two groups 5, 10, 15, 30 and 60 minutes after injecting the hyperbaric 0.5% bupivacaine.
CONCLUSIONS
The injection speed of local anesthetics is one of the crucial factors for achieving a unilateral spinal anesthesia. Therefore, it is important to maintain a slow injection speed of a local anesthetic in unilateral spinal anesthesia.
Key Words: injection speed; success rate; unilateral spinal anesthesia
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