COLD SALINE IS MORE EFFECTIVE THAN ROOM-TEMPERATURE SALINE IN INDUCING PARESTHESIA DURING AXILLARY BLOCK

Confirmation of the perivascular position of the needle by the injecti on 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 f ound a 100% incidence of successful block with saline at 8-1l 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 st imulation and not to mechanical nerve compression by the saline enteri ng the axillary space. A more frequent rate of correct positioning of the needle was found in the group with cold saline.