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To the Editor:
—I wish to call attention to a simple but effective method of applying the ethyl chlorid spray for local analgesia. I have used this method for the last four years in opening localized infections and in the fulguration of warty growths. The reason that the freezing method as universally used is not effective is that the tissues are so hard that pressure enough to cause pain must be applied before the sharpest knife will cut through the frozen tissues. The method I suggest is to apply the spray so as to form a circle around the area to be incised or fulgurated, care being taken to keep the spray away from the center. The width of the frozen area should be at least half an inch, and there should be at least 1 inch of unfrozen area in the center of the circle. Blowing the breath on
Raymond L. Bradley. METHOD FOR UTILIZING ETHYL CHLORID IN LOCAL ANALGESIA. JAMA. 1922;79(2):151. doi:10.1001/jama.1922.02640020063031