ArticleCureus2026
Assessment of the Optimal Distal End Length of Echogenic Perineural Catheters to Facilitate Successful Coiling: A Regional Anesthesia Simulator-Based Technical Study.
Article in Cureus, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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6 authors.
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Abstract
introductionWe investigated the optimal length of a flexible end-portion of an echogenic-straight perineural catheter that would facilitate a catheter's flexible distal portion to coil behind the sciatic nerve in a Blue Phantom nerve block simulator (Elevate Healthcare, Sarasota, Florida, United States).
methodsIn 80 20G perineural echogenic catheters, the integral stylet was retracted at various lengths (from 3 cm to 10 cm) so that the optimal catheter's flexible length that enables the catheter's flexible end portion (3-10 cm) to coil could be evaluated. Ten perineural catheters were allocated per cm of retraction. In our binary format, two variables were included: the first was the length of the catheter's distal flexible end, and the second was whether the catheter's distal end was coiled or not coiled. Optimal probabilities (90% and 95%) predicting the catheter's optimal flexible distal length that facilitates successful coiling or not were evaluated by probit regression.
resultsOverall, 64 of the 80 perineural catheters were coiled. Analysis showed that withdrawing the integral stylet of a perineural catheter by 7 (6.1-9.4) cm and 8.1 (6.9-11.3) cm resulted in an optimal successful coiling with 90% and 95% probability (
conclusionRetracting the integral stylet of a perineural catheter by specific lengths facilitates the coiling of its flexible distal end with high probability. This configuration could provide a functional buffer of catheter length, mitigating the risk of tip dislocation from its intended position.
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