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Level of injection in spinal anesthesia: effect on sensory anesthetic level
N Becker1, T Callesen, B Thage
1Department of Anaesthesiology and Intensive Care, Frederiksberg Hospital Ndr., Copenhagen, Denmark.
Background And Objectives:
A prospective, randomized study was performed to investigate the influence of the level of injection on sensory anesthesia when bupivacaine 0.5% adjusted to 37.0 C was used.
Methods:
Three milliliters of plain bupivacaine 0.5% were injected at either the L2-3 interspace or the L4-5 interspace. There were 10 patients in each group. The patients were kept sitting for 2 minutes after injection.
Results:
No significant difference in maximal level of sensory anesthesia was found (p = 0.123).
Conclusion:
These preliminary results indicate that if a higher level of injection is more suitable for anatomic reasons, it can safely be used without the risk of a much higher level of sensory blockade.