The Effect of Injection Speed of Local Anesthetic on Success Rate of Unilateral Spinal Anesthesia.
10.4097/kjae.2005.49.6.793
- Author:
Hyun Sook CHO
1
;
Youn Suk SON
;
Kyu Don CHUNG
;
Won Hyung LEE
;
Jong Min PARK
;
Ji Hyun CHUNG
;
Sang Mook LEE
Author Information
1. Department of Anesthesiology and Pain Medicine, College of Medicine, The Catholic University of Korea, Seoul, Korea. ismoogi@hanmail.net
- Publication Type:Original Article ; Randomized Controlled Trial
- Keywords:
injection speed;
success rate;
unilateral spinal anesthesia
- MeSH:
Anesthesia, Spinal*;
Anesthetics, Local;
Blood Pressure;
Bupivacaine;
Humans;
Paralysis;
Sensation;
Syringes
- From:Korean Journal of Anesthesiology
2005;49(6):793-797
- CountryRepublic of Korea
- Language:Korean
-
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.
