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A member asked:
If codman hakim programmable vp shunt is set at 140, how much fluid is being drained?
3 doctors weighed in across 2 answers
Depends on pressure: The valve setting refers to a pressure value, rather than volume of csf. A setting of 140 means that the valve opens and begins draining when the pressure reaches 140 mmhg, and below that level the valve remains closed. Therefore the amount of CSF drained depends on how much time the pressure remained over the opening pressure. This may be 0 to 100%.
Answered 1/1/2015
5.3k views
Depends: The 140 refers to a threshold opening pressure of 140 mm water for the pressure regulating valve. The volume of CSF drained will depend on the extent to which the intracranial pressure reaches that threshold. In general adults secrete about 500 ml of CSF per day.
Answered 6/10/2014
5.3k views
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