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Regional Anesthesia Needles Can Introduce Ultrasound Gel into Tissues

BACKGROUND: Anesthesiologists may insert needles through ultrasound gel when performing ultrasound-guided regional anesthesia. In this study, it was determined whether needles carry gel into tissues. METHODS: Ultrasound gel dyed blue was applied to pork rashers. Tuohy and short-bevel needles were passed through the gel and pork. The needles were then assessed for the presence of ultrasound gel. RESULTS: All needles, including those with stylets, carried gel and tissue within the lumen. CONCLUSIONS: Ultrasound gel may be injected around (and perhaps in) nerves during regional anesthesia procedures. Studies are needed to determine the implications of this practice.