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Paravertebral Blockade for Mastectomy: The Importance of Assessing Efficacy

been perceived as cold less often than if ice was used as a comparison. It is assumed that the evaporative effect of alcohol is perceived as cold by most individuals. However, the effectiveness of using room-temperature alcohol swabs for cold stimulation has never been studied until now. Alcohol swabs are sterile, inexpensive, and readily available without the need for preprocedural or postprocedural preparation (eg, sterilization, refrigeration, provisional stocking); therefore, they are an attractive instrument for thermal stimulation. However, because neither the alcohol swabs nor the frozen swabs were perceived as cold 100% of the time, this study therefore serves to remind clinicians that the cold test for assessing nerve blocks is as subjective as any other sensory test.