Q:

The measurement of cerebrospinal fluid (CSF) pressure is made while the patient is lying down rather than sitting up. The horizontal posture prevents a false high reading due to

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The measurement of cerebrospinal fluid (CSF) pressure is made while the patient is lying down rather than sitting up. The horizontal posture prevents a false high reading due to


  1. the weight of the ‘head’ of CSF in the spinal cord.
  2. possible movement of the patient while sitting up.
  3. pressure on the lumbar vertebrae when the back is vertical.
  4. the greater muscle tone needed to maintain a sitting position.

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A: In the sitting position the CSF pressure as measured by tapping into the lumbar region would be increased by the head of pressure of about 40 cm of water.

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