Nerve Block Clinical Trial
Official title:
Influence of Ultrasonographic Hydro-dissection With Glucose 5% Solution on Median Nerve Block Efficiency: a Prospective and Randomized Study
The real-time visualization of a needle and nerve during an ultrasound-guided nerve block
can be challenging. These difficulties may partly explain the systemic complications of
local anesthetics under ultrasound. Injection of small amounts of a solution around the
anesthetized nerve (hydro-dissection) has been proposed to enhance contrast outlining its
borders and also to improve the visualization of the needle tip. The glucose solution 5%
solution is interesting because it allows, unlike saline, to maintain the motor response
with neurostimulation. The hydro-dissection can be particularly useful when one suspect
hypoechoic vessels near the nerve to be anesthetized. Thereby, the nerve well demarcated and
separated from the vessels, injection of local anesthetic is performed in the
circumferential diffusion space (like a small pocket) without redirecting needle.
The influence of this hydro-dissection on the nerve block efficiency is unknown. The nerve
block quality can be improved because the entire anesthetic is injected in contact with the
nerve, but it can also be reduced due to the dilution of the local anesthetic by the glucose
solution.
In this randomized study, the investigators test the hypothesis that hydro-dissection does
not alter the nerve block onset time.
n/a
Allocation: Randomized, Endpoint Classification: Efficacy Study, Intervention Model: Parallel Assignment, Masking: Double Blind (Subject, Caregiver, Investigator, Outcomes Assessor), Primary Purpose: Treatment
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