title: Cold saline is more effective than room temperature saline in inducing paresthesia during axillary block.
abstract: Confirmation 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.
authors.affiliation: Department of Anesthesiology, Hospital General de Galicia-Clínico Universitario, Santiago, Spain.
authors.forename: J
authors.initials: J
authors.lastname: Rodríguez
authors.forename: J
authors.initials: J
authors.lastname: Carceller
authors.forename: M
authors.initials: M
authors.lastname: Bárcena
authors.forename: I
authors.initials: I
authors.lastname: Pedraza
authors.forename: B
authors.initials: B
authors.lastname: Calvo
authors.forename: J
authors.initials: J
authors.lastname: Alvarez
mesh_terms: D001365:Axilla / Q000294:innervation*; D003080:Cold Temperature; D005260:Female; D006801:Humans; D015994:Incidence; D008297:Male; D008475:Median Nerve / Q000503:physiopathology; D008875:Middle Aged; D009138:Musculocutaneous Nerve / Q000503:physiopathology; D009339:Needles; D009407:Nerve Block / Q000295:instrumentation* / Q000379:methods; D010292:Paresthesia / Q000503:physiopathology*; D010812:Physical Stimulation; D011446:Prospective Studies; D011826:Radial Nerve / Q000503:physiopathology; D012965:Sodium Chloride; D013696:Temperature; D014459:Ulnar Nerve / Q000503:physiopathology
chemical_list: D012965:Sodium Chloride