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To the Editor.—From communications to the Archives and from comments by your advertisers it may be understood that a number of problems have been encountered during the caloric test and with the instrucments used. The test must be regarded as a simple and reliable clinical test and not a scientifically accurate investigation requiring unvaryingly accurate water temperature of 30 and 44 C at the drum-head. Variables such as length and width of the external auditory meatus and the dimensions of the mastoid bone, beyond our control, are considerable. It was some years after he devised this test before Hallpike agreed to allow a tank-reservoir system to be used in his clinic; with much justification he considered the simple douche-can and standard gauge rubber tube for delivery accurate enough for clinical purposes, provided before testing the water was allowed to run free until the cold water in the tube was
HARRISON MS. CALORIC TESTING. Arch Otolaryngol. 1971;94(3):284. doi:10.1001/archotol.1971.00770070278021
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