Comparison of Continuous Non-Invasive and Invasive Intracranial Pressure Measurement
Comparison of Continuous Non-Invasive and Invasive Intracranial Pressure Measurement
This research is being done to determine the accuracy of two noninvasive methods of measuring
 the pressure of the cerebrospinal fluid (CSF), also known as intracranial pressure or ICP.
Recently, astronauts in long-duration spaceflight have been found to have a syndrome
 consisting of swelling of the optic nerve, impaired vision, and elevated cerebrospinal fluid
 pressure (also known as intracranial pressure [ICP]) via lumbar puncture (LP), which is
 similar to the syndrome of idiopathic intracranial hypertension (IIH). In astronauts, this
 syndrome is called Visual Impairment/Intracranial Pressure (VIIP). It is not possible to
 perform an LP on astronauts in space. Noninvasive methods of estimating ICP exist but have
 not been tested against continuous ICP methods in a patient cohort that is physiologically
 similar to that of astronauts.

 The primary objective of this study is to determine the validity, reliability, accuracy, and
 precision of two noninvasive methods of ICP measurement (tympanic membrane displacement (TMD,
 Marchbanks Measurements Systems, UK) and distortion product otoacoustic emissions (DPOAE) in
 comparison to a reference standard, invasive ICP measurement, in human subjects undergoing
 diagnostic ICP monitoring.

 The two noninvasive methods are based on the responses of the inner ear and middle ear to
 changes in ICP. The first method is TMD, which measures tiny movements of the ear drum, and
 the second is DPOAE, which is routinely used for newborn hearing screening.

 Adults with hydrocephalus or pseudotumor cerebri who have been recommended on the basis of
 standard clinical criteria to have ICP monitoring either by insertion of a temporary spinal
 catheter or by insertion of a needle into an existing shunt reservoir are eligible.

 After insertion of the spinal catheter or the needle in the shunt, subjects will undergo
 testing with the TMD and DPOAE in the lying, sitting, standing, and head-down tilt (10
 degrees) position. In addition, testing will be performed during sleep, when normal
 fluctuations of ICP occur.

 Diagnostic decisions will be based on the standard invasive ICP monitoring only, and not
 based on the noninvasive ICP monitoring.
Inclusion Criteria:

 -  Clinical diagnosis of suspected symptomatic hydrocephalus or idiopathic intracranial
 hypertension (pseudotumor cerebri)

 -  ICP monitoring via 25-ga needle in an existing shunt reservoir or ICP monitoring via
 spinal catheter has been recommended on the basis of standard clinical criteria

 -  Capable of providing valid signed informed consent

 -  Normal middle-ear function as determined by tympanometry

 -  DPOAE meet criteria that are required for the research

 -  Acoustic stapedial reflex meets criteria that are required for the research

 -  Subject is willing and able to return for the study

 Exclusion Criteria:

 -  Subject is pregnant

 -  Subject lacks decision-making capacity

 -  Subject is unwilling or unable to return for the study

 -  Prior middle-ear disease or surgery, with the exception of tympanostomy tubes that
 have been removed and are healed

 -  Participating in the study would significantly delay or interfere with the subject's
 healthcare

 -  Subject has excess ear wax that cannot be removed safely and could potentially be
 pushed onto the ear drum by the insertion of the ear plugs needed for the testing

 -  The TMD or DPOAE do not respond to a change in posture from lying flat to standing up,
 which means that the anatomic connection between the inner ear and the CSF is absent