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September 10, 1927


Author Affiliations

Stockton, Calif.

JAMA. 1927;89(11):883. doi:10.1001/jama.1927.92690110001017a

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The importance of estimating accurately the pressure of the cerebrospinal fluid at lumbar puncture by means of a mercurial instrument has received increasing attention during the past decade. It is now recognized as the only safe method of controlling the pressure of the cerebrospinal fluid during therapeutic drainage. Not more cerebrospinal fluid should be removed than will lower the pressure by one half; in this manner, there is no danger of lowering the spinal pressure to a degree that might precipitate medullary complications in the presence of high intracranial pressure.

Many general practitioners are desirous frequently of making special tests, but they are often handicapped for the lack of the special instruments used ordinarily by the specialists; the spinal mercurial manometer is such an instrument, but I find that in its place an ordinary mercurial sphygmomanometer used for blood pressure readings can very easily be substituted and most

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