NCT01976559

Comparison of Continuous Noninvasive and Invasive Intracranial Pressure Measurement--Celda Infusion Subprotocol

• Status: Completed
• Phase: N/A
• Study type: Interventional
• Enrollment: 15 (actual)
• Sponsor: LifeBridge Health · Academic / Other
• Sex: All
• Age: 18 Years – 80 Years
• Healthy volunteers: Not accepted

Summary

This research is being done to determine the accuracy of two noninvasive methods of measuring the pressure of the spinal fluid, also known as intracranial pressure (ICP).

Detailed description

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 cerebrospinal fluid (CSF) infusion testing. 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, shunt malfunction, or other disorders of CSF circulation who have been recommended on the basis of standard clinical criteria to have CSF infusion testing are eligible.

Conditions

• Hydrocephalus
• Shunt Malfunction

Interventions

Type	Name	Description
DEVICE	Tympanic Membrane Displacement (TMD)	The CCFP Analyser has a passive mode and an active mode. When used in active mode, the device generates a tone burst that is transmitted to the ear to elicit contraction of the stapedius muscle. The passive mode requires no stimulus or sound burst. For each ICP level during the CSF infusion testing, the active mode will be used. Each condition comprises 13 stimuli of 0.3s duration.
DEVICE	DPOAE	DPOAE measurement uses a clinical acoustic probe to record the ear's response to two simultaneous tones. DPOAE measurements will be made for 13 tones. The total measurement time for each condition is 2-4 minutes.

Timeline

• Start date: 2013-11-01
• Primary completion: 2014-03-01
• Completion: 2014-03-01
• First posted: 2013-11-06
• Last updated: 2017-08-11

Locations

1 site across 1 country: Sweden