Document Detail

Objective B wave analysis in 55 patients with non-communicating and communicating hydrocephalus.
MedLine Citation:
PMID:  15965203     Owner:  NLM     Status:  MEDLINE    
BACKGROUND: B waves, slow and rhythmic oscillations in intracranial pressure (ICP), are claimed to be one of the best predictors of outcome after surgery for normal pressure hydrocephalus (NPH). OBJECT: To determine the relation between the percentage of B waves and outcome in patients with hydrocephalus, and also the diurnal variation of B waves. METHODS: ICP and patient behaviour were recorded overnight (17 to 26 hours) in 29 patients with non-communicating hydrocephalus and 26 with NPH. The B wave activity, measured with an amplitude threshold of 0.5, 0.75, 1.0, 1.5, 2.0, 3.0, and 5.0 mm Hg, was estimated as the percentage of total monitoring time (% B waves) using a computer algorithm, and correlated with postoperative outcome, defined as changes in 12 standardised symptoms and signs. RESULTS: There was no linear correlation between improvement after surgery in the 55 patients and total % B waves, but a correlation was found between improvement and % B waves during sleep (r = 0.39, p = 0.04). The percentage of B waves was the same during sleep and wakefulness, and patients with NPH had the same proportion of B waves as the non-communicating patients. CONCLUSIONS: B waves are commonly observed in patients with both communicating and non-communicating hydrocephalus, but are only weakly related to the degree of postsurgical improvement.
H Stephensen; N Andersson; A Eklund; J Malm; M Tisell; C Wikkelsö
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Journal of neurology, neurosurgery, and psychiatry     Volume:  76     ISSN:  0022-3050     ISO Abbreviation:  J. Neurol. Neurosurg. Psychiatr.     Publication Date:  2005 Jul 
Date Detail:
Created Date:  2005-06-20     Completed Date:  2005-07-19     Revised Date:  2009-11-18    
Medline Journal Info:
Nlm Unique ID:  2985191R     Medline TA:  J Neurol Neurosurg Psychiatry     Country:  England    
Other Details:
Languages:  eng     Pagination:  965-70     Citation Subset:  IM    
Hydrocephalus Research Unit, Institute of Clinical Neuroscience, Sahlgrenska University Hospital, Göteborg University, 413 45 Göteborg, Sweden.
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MeSH Terms
Aged, 80 and over
Cerebral Ventricles / pathology
Cerebrospinal Fluid Shunts
Follow-Up Studies
Hydrocephalus / diagnosis*,  physiopathology,  surgery
Hydrocephalus, Normal Pressure / diagnosis*,  physiopathology,  surgery
Intracranial Pressure / physiology*
Magnetic Resonance Imaging
Middle Aged
Neuropsychological Tests
Postoperative Complications / diagnosis,  physiopathology

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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