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document
A randomised controlled comparison between stimulating and standard catheters for lumbar plexus block . The aim of this randomised , prospective , blinded study was to evaluate if stimulating catheters can decrease the minimum effective anaesthetic volume in 50 % of patients during lumbar plexus block using mepivacaine 1.5 % compared with standard catheters . Fifty-eight patients of ASA physical status 1-3 were randomly allocated to receive a lumbar plexus block via a stimulating or standard catheter , with 29 in each group . The first dose was 30 ml and subsequent doses were determined using the up-and-down staircase method . The minimum effective anaesthetic volume50 was 12.2 ml ( 95 % CI 7.3-17.1 ml ) using the stimulating catheter and 24.8 ml ( 95 % CI 23.2-27.5 ml ) with the standard catheter ( p < 0.0001 ) . Complete lumbar plexus block was achieved with the initial dose of mepivacaine in 29 ( 100 % ) patients in the stimulating catheter group and 20 ( 69 % ) patients in the standard catheter group ( p = 0.002 ) . This study showed that use of a stimulating catheter halves the minimum effective anaesthetic volume50 of mepivacaine 1.5 % while increasing the success rate in patients receiving continuous lumbar plexus block .
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Intervention_Physical
stimulating and
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Intervention_Control
standard catheters
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Intervention_Physical
stimulating catheters
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Intervention_Pharmacological
mepivacaine
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Intervention_Control
standard catheters
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Intervention_Physical
lumbar plexus block via a stimulating or
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Intervention_Control
standard catheter
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Outcome_Physical
lumbar plexus block .
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Outcome_Physical
minimum effective anaesthetic volume
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Outcome_Other
effective anaesthetic volume50
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Outcome_Physical
Complete lumbar plexus block
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Outcome_Other
success rate
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Participant_Condition
patients during lumbar plexus block
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Participant_Sample-size
Fifty-eight patients
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Participant_Condition
lumbar plexus block
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Participant_Condition
standard catheter
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Participant_Sample-size
29