Abstract:
OBJECTIVE:The discovery of a posture-dependent effect on the difference between intraocular pressure (IOP) and intracranial pressure (ICP) at the level of lamina cribrosa could have important implications for understanding glaucoma and idiopathic intracranial hypertension and could help explain visual impairments in astronauts exposed to microgravity. The aim of this study was to determine the postural influence on the difference between simultaneously measured ICP and IOP. METHODS:Eleven healthy adult volunteers (age = 46 ± 10 years) were investigated with simultaneous ICP, assessed through lumbar puncture, and IOP measurements when supine, sitting, and in 9° head-down tilt (HDT). The trans-lamina cribrosa pressure difference (TLCPD) was calculated as the difference between the IOP and ICP. To estimate the pressures at the lamina cribrosa, geometrical distances were estimated from magnetic resonance imaging and used to adjust for hydrostatic effects. RESULTS:The TLCPD (in millimeters of mercury) between IOP and ICP was 12.3 ± 2.2 for supine, 19.8 ± 4.6 for sitting, and 6.6 ± 2.5 for HDT. The expected 24-hour average TLCPD on earth-assuming 8 hours supine and 16 hours upright-was estimated to be 17.3mmHg. By removing the hydrostatic effects on pressure, a corresponding 24-hour average TLCPD in microgravity environment was simulated to be 6.7mmHg. INTERPRETATION:We provide a possible physiological explanation for how microgravity can cause symptoms similar to those seen in patients with elevated ICP. The observed posture dependency of TLCPD also implies that assessment of the difference between IOP and ICP in upright position may offer new understanding of the pathophysiology of idiopathic intracranial hypertension and glaucoma. Ann Neurol 2016;80:269-276.
journal_name
Ann Neuroljournal_title
Annals of neurologyauthors
Eklund A,Jóhannesson G,Johansson E,Holmlund P,Qvarlander S,Ambarki K,Wåhlin A,Koskinen LO,Malm Jdoi
10.1002/ana.24713subject
Has Abstractpub_date
2016-08-01 00:00:00pages
269-76issue
2eissn
0364-5134issn
1531-8249journal_volume
80pub_type
杂志文章abstract::The in vivo demyelinating capacity of sera from 27 patients with Guillain-Barré syndrome (GBS) and 47 other individuals was studied by intraneural injection into rat sciatic nerves. The morphological features of the nerves in cross section taken just proximal to the site of needle insertion was assessed 48 hours after...
journal_title:Annals of neurology
pub_type: 杂志文章
doi:10.1002/ana.410110112
更新日期:1982-01-01 00:00:00
abstract::We report the first molecular defect in an NADH-dehydrogenase gene presenting as isolated myopathy. The proband had lifelong exercise intolerance but no weakness. A muscle biopsy showed cytochrome c oxidase (COX)-positive ragged-red fibers (RRFs), and analysis of the mitochondrial enzymes revealed complex I deficiency...
journal_title:Annals of neurology
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doi:10.1002/1531-8249(199906)45:6<820::aid-ana22>3.0.c
更新日期:1999-06-01 00:00:00
abstract::Orally administered levodopa remains the most effective symptomatic treatment for Parkinson's disease (PD). The introduction of levodopa therapy is often delayed, however, because of the fear that it might be toxic for the remaining dopaminergic neurons and, thus, accelerate the deterioration of patients. However, in ...
journal_title:Annals of neurology
pub_type: 杂志文章
doi:10.1002/ana.410430504
更新日期:1998-05-01 00:00:00
abstract::Ultrasound scans of three newborn infants with cerebral ischemic lesions demonstrated on computed tomographic scan showed unexpected changes in echogenicity of brain parenchyma in addition to lateralized mass effect. Areas of increased echogenicity were present adjacent to regions of infarction identified on computed ...
journal_title:Annals of neurology
pub_type: 杂志文章
doi:10.1002/ana.410140212
更新日期:1983-08-01 00:00:00
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journal_title:Annals of neurology
pub_type: 临床试验,杂志文章
doi:10.1002/ana.410170405
更新日期:1985-04-01 00:00:00
abstract:OBJECTIVE:Therapeutic drug monitoring (TDM) of antiepileptic drugs (AEDs) is widely established for older generation AEDs, whereas there is limited evidence about newer AEDs. Our aim is to assess the benefit of TDM of newer generation AEDs in epilepsy. METHODS:We performed a randomized, controlled trial comparing syst...
journal_title:Annals of neurology
pub_type: 杂志文章,随机对照试验
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abstract::We examined the expression of Fas antigen and Bcl-2 protein in thymic tissue surgically resected from 10 patients with myasthenia gravis, using immunocytochemical techniques. Histologically, thymic tissues from 7 myasthenia gravis patients showed hyperplasia, while 3 other patients had thymomas. In hyperplastic thymic...
journal_title:Annals of neurology
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doi:10.1002/ana.410390414
更新日期:1996-04-01 00:00:00
abstract::In a prospective study, we repeatedly recorded fast goal-directed wrist movements of 8 patients who had experienced an acute cerebellar hypermetria due to a stroke and who had subsequently recovered clinically. Movements and the associated agonist and antagonist electromyographic (EMG) activities were recorded before ...
journal_title:Annals of neurology
pub_type: 杂志文章
doi:10.1002/ana.410380314
更新日期:1995-09-01 00:00:00
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journal_title:Annals of neurology
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journal_title:Annals of neurology
pub_type: 杂志文章
doi:10.1002/ana.22085
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pub_type: 杂志文章
doi:10.1002/ana.410160509
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journal_title:Annals of neurology
pub_type: 杂志文章
doi:10.1002/ana.410200409
更新日期:1986-10-01 00:00:00
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journal_title:Annals of neurology
pub_type: 杂志文章
doi:10.1002/ana.410420221
更新日期:1997-08-01 00:00:00
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journal_title:Annals of neurology
pub_type: 杂志文章
doi:10.1002/ana.24470
更新日期:2015-09-01 00:00:00
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journal_title:Annals of neurology
pub_type: 杂志文章
doi:10.1002/ana.24504
更新日期:2015-11-01 00:00:00
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journal_title:Annals of neurology
pub_type: 杂志文章
doi:10.1002/ana.410230317
更新日期:1988-03-01 00:00:00
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journal_title:Annals of neurology
pub_type: 杂志文章
doi:10.1002/ana.410030507
更新日期:1978-05-01 00:00:00
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journal_title:Annals of neurology
pub_type: 杂志文章
doi:10.1002/ana.410090209
更新日期:1981-02-01 00:00:00
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journal_title:Annals of neurology
pub_type: 杂志文章
doi:10.1002/ana.25726
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journal_title:Annals of neurology
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pub_type: 杂志文章
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更新日期:2010-02-01 00:00:00
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journal_title:Annals of neurology
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journal_title:Annals of neurology
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更新日期:1996-12-01 00:00:00
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journal_title:Annals of neurology
pub_type: 杂志文章
doi:10.1002/ana.410070304
更新日期:1980-03-01 00:00:00
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journal_title:Annals of neurology
pub_type: 杂志文章
doi:10.1002/ana.410300118
更新日期:1991-07-01 00:00:00
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更新日期:1986-12-01 00:00:00
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journal_title:Annals of neurology
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更新日期:1984-04-01 00:00:00
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更新日期:2019-06-01 00:00:00