Emergencias
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Randomized Controlled Trial Comparative Study
[Ethyl chloride aerosol spray for local anesthesia before arterial puncture: randomized placebo-controlled trial].
To compare the efficacy of an ethyl chloride aerosol spray to a placebo spray applied in the emergency department to the skin to reduce pain from arterial puncture for blood gas analysis. ⋯ Topical application of an ethyl chloride spray did not reduce pain caused by arterial puncture.