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Reference values for CSF outflow resistance and intracranial pressure in healthy elderly.
MedLine Citation:
PMID:  21383326     Owner:  NLM     Status:  In-Data-Review    
Abstract/OtherAbstract:
OBJECTIVE: The intracranial pressure (ICP) and CSF outflow resistance (R(out)) are essential to describe the dynamics of the CSF system. R(out) affects ICP, pulse amplitudes, CSF absorption, and the compliance of the system. The objective of this study was to determine the reference values in healthy elderly subjects.
METHODS: Elderly people (60-82 years), who considered themselves healthy, were recruited through an advertisement in the local newspaper. All were evaluated with a 3-T MRI. Subjects were eligible if they did not have any psychiatric or neurologic disorder or signs of advanced atherosclerotic disease. CSF resting pressure (ICP) and R(out) were determined by a constant pressure infusion method with the patient in the supine position. The study population consisted of 40 subjects (mean age 70 years; 23 women).
RESULTS: The median ICP was 11.6 mm Hg (15.8 cmH(2)O) and the reference interval was ICP 7.8-14.3 mm Hg (10.6-19.4 cmH(2)O) (defined as 5th to 95th percentiles). The median R(out) was 8.6 mm Hg/mL/min. The variation in R(out) was large and not normally distributed. The 90th percentile of R(out) was 17.4 mm Hg/mL/min.
CONCLUSIONS: This study reports reference values for ICP and R(out) and should be used for comparison when investigating disorders with suspected CSF dynamic disturbances in the elderly. ICP was in the same range as that reported in the young and middle-aged. The upper limit of R(out) was higher than previously believed to be the upper limit of normal for this age group.
Authors:
Jan Malm; Johan Jacobsson; Richard Birgander; Anders Eklund
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Neurology     Volume:  76     ISSN:  1526-632X     ISO Abbreviation:  Neurology     Publication Date:  2011 Mar 
Date Detail:
Created Date:  2011-03-08     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0401060     Medline TA:  Neurology     Country:  United States    
Other Details:
Languages:  eng     Pagination:  903-9     Citation Subset:  AIM; IM    
Affiliation:
Department of Clinical Neuroscience, Umeå University, SE-901 85 Umeå, Sweden Jan.Malm@neuro.umu.se.
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