Is there a role for using an external ventricular drain (EVD) trial in the workup of normal pressure hydrocephalus?

Typically, the work-up of normal pressure hydrocephalus involves either a large volume lumbar puncture or a 48-72 hour lumbar drain trial (and sometimes both). An external ventricular drain would be too invasive.

There is an excellent review article that was recently published regarding this topic:

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