• Anesthesia and analgesia · Aug 1995

    Randomized Controlled Trial Comparative Study Clinical Trial

    Cold saline is more effective than room temperature saline in inducing paresthesia during axillary block.

    • J Rodríguez, J Carceller, M Bárcena, I Pedraza, B Calvo, and J Alvarez.
    • Department of Anesthesiology, Hospital General de Galicia-Clínico Universitario, Santiago, Spain.
    • Anesth. Analg. 1995 Aug 1;81(2):329-31.

    AbstractConfirmation of the perivascular position of the needle by the injection of cold saline may be helpful to the perivascular technique, since the elicitation of a paresthesia indicates the correct positioning of the needle. In this prospective, randomized study of 48 patients, we found a 100% incidence of successful block with saline at 8-11 degrees C compared to 75% in a control group with saline at room temperature. The paresthesia induced by cold saline appears to be due to thermic stimulation and not to mechanical nerve compression by the saline entering the axillary space. A more frequent rate of correct positioning of the needle was found in the group with cold saline.

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