Increasing the injection volume by dilution improves the onset of motor blockade, but not sensory blockade of ropivacaine for brachial plexus block
| Autor: | W. Oczenski, R. D. Fitzgerald, Herbert Krenn, Helmuth Jellinek, B. Balogh, E. Deusch, E. Plainer-Zöchling |
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| Rok vydání: | 2003 |
| Předmět: |
Male
medicine.drug_class medicine.medical_treatment Sensation Double-Blind Method medicine Humans Brachial Plexus Ropivacaine Neurons Afferent Prospective Studies Anesthetics Local Brachial plexus block Motor Neurons Plexus Local anesthetic business.industry Nerve Block Middle Aged Hand Amides Electric Stimulation Blockade Anesthesiology and Pain Medicine Touch Anesthesia Nerve block Female medicine.symptom business Brachial plexus Muscle Contraction medicine.drug Muscle contraction |
| Zdroj: | European Journal of Anaesthesiology. 20:21-25 |
| ISSN: | 0265-0215 |
| DOI: | 10.1097/00003643-200301000-00004 |
| Popis: | Summary Background and objective: Ropivacaine used for axillary plexus block provides effective motor and sensory blockade. Varying clinical dosage recommendations exist. Increasing the dosage by increasing the concentration showed no improvement in onset. We compared the behaviour of a constant dose of ropivacaine 150 mg diluted in a 30, 40 or 60 mL injection volume for axillary (brachial) plexus block. Methods: A prospective, randomized, observer-blinded study on patients undergoing elective hand surgery was conducted in a community hospital. Three groups of patients with a constant dose of ropivacaine 150 mg, diluted in 30, 40 or 60 mL NaCl 0.9%, for axillary plexus blockade were compared for onset times of motor and sensory block onset by assessing muscle strength, two-point discrimination and constant-touch sensation. Results: Increasing the injection volume of ropivacaine 150 mg to 60 mL led to a faster onset of motor block, but not of sensory block, in axillary plexus block, compared with 30 or 40 mL volumes of injection. Conclusions: The data show that the onset of motor, but not of sensory block, is accelerated by increasing the injection volume to 60 mL using ropivacaine 150 mg for axillary plexus block. This may be useful for a more rapid determination of whether the brachial plexus block is effective. However, when performing surgery in the area of the block, sensory block onset seems more important. |
| Databáze: | OpenAIRE |
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