Evidence map›Paper›PMID 25554415›Full record

ArticleJournal of neuroscience methods2015

A novel method to study cerebrospinal fluid dynamics in rats.

Jason K Karimy, Kristopher T Kahle, David B Kurland, Edward Yu, Volodymyr Gerzanich, J Marc Simard

Abstract read
In one paragraph

Article in Journal of neuroscience methods, 2015. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 43 papers, 1 of them a synthesis that pooled it.

0numbers the graph read from it
0cells of the map it votes in
43citing papers in PubMed, 1 pooled it
0.8field-weighted citation impact, top 33% of its field
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

43 citing papers in PubMed, 1 synthesis or guideline pooled it, 76 citations in OpenAlex.

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4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

6 authors at 2 institutions in 1 country.

Jason K KarimyDepartment of Neurosurgery, University of Maryland School of Medicine, Baltimore, MD, United States.
Kristopher T KahleManton Center for Orphan Disease Research, Boston Children's Hospital, Boston, MA, United States; Department of Neurosurgery, Boston Children's Hospital, Boston, MA, United States.
David B KurlandDepartment of Neurosurgery, University of Maryland School of Medicine, Baltimore, MD, United States.
Edward YuDepartment of Neurosurgery, University of Maryland School of Medicine, Baltimore, MD, United States.
Volodymyr GerzanichDepartment of Neurosurgery, University of Maryland School of Medicine, Baltimore, MD, United States.
J Marc SimardDepartment of Neurosurgery, University of Maryland School of Medicine, Baltimore, MD, United States; Department of Pathology, University of Maryland School of Medicine, Baltimore, MD, United States; Department of Physiology, University of Maryland School of Medicine, Baltimore, MD, United States. Electronic address: msimard@smail.umaryland.edu.
University of Maryland, Baltimore · USBoston Children's Hospital · US

Funding

Sulfonylurea receptor 1 (SUR1)- A novel therapeutic target in ischemic strokeR01HL082517 · NHLBI · UNIVERSITY OF MARYLAND BALTIMORE · PI SIMARD, J. MARC · 2006 to 2021
$5.6M
TRPM4 channel in spinal cord injuryR01NS061934 · NINDS · UNIVERSITY OF MARYLAND BALTIMORE · PI GERZANICH, VLADIMIR · 2008 to 2018
$3.3M
Spinal cord injury, progressive hemorrhagic necrosis and the NC(Ca-ATP) channelR01NS060801 · NINDS · UNIVERSITY OF MARYLAND BALTIMORE · PI SIMARD, J. MARC · 2009 to 2018
$3.3M
Pathological role of the SUR1-regulated NC(Ca-ATP) channel in cortex after subaraR01NS061808 · NINDS · UNIVERSITY OF MARYLAND BALTIMORE · PI SIMARD, J. MARC · 2009 to 2013
$1.6M
Role of TRP channels in secondary injury after brain traumaR01NS072501 · NINDS · UNIVERSITY OF MARYLAND BALTIMORE · PI GERZANICH, VLADIMIR · 2011 to 2014
$1.3M
Brain injury due to transcranial versus transthoracic blast exposureI01BX001629 · VA · BALTIMORE VA MEDICAL CENTER · PI SIMARD, J. MARC · 2013 to 2016
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BLRD VA I01 BX001629NHLBI NIH HHS HL082517NHLBI NIH HHS R01 HL082517NINDS NIH HHS NS060801NINDS NIH HHS NS061808NINDS NIH HHS NS061934NINDS NIH HHS NS072501NINDS NIH HHS R01 NS060801NINDS NIH HHS R01 NS061808NINDS NIH HHS R01 NS061934NINDS NIH HHS R01 NS072501
6 · The paper itself

Abstract

backgroundCerebrospinal fluid (CSF) flow dynamics play critical roles in both the immature and adult brain, with implications for neurodevelopment and disease processes such as hydrocephalus and neurodegeneration. Remarkably, the only reported method to date for measuring CSF formation in laboratory rats is the indirect tracer dilution method (a.k.a., ventriculocisternal perfusion), which has limitations. NEW

methodAnesthetized rats were mounted in a stereotaxic apparatus, both lateral ventricles were cannulated, and the Sylvian aqueduct was occluded. Fluid exited one ventricle at a rate equal to the rate of CSF formation plus the rate of infusion (if any) into the contralateral ventricle. Pharmacological agents infused at a constant known rate into the contralateral ventricle were tested for their effect on CSF formation in real-time.

resultsThe measured rate of CSF formation was increased by blockade of the Sylvian aqueduct but was not changed by increasing the outflow pressure (0-3cm of H2O). In male Wistar rats, CSF formation was age-dependent: 0.39±0.06, 0.74±0.05, 1.02±0.04 and 1.40±0.06μL/min at 8, 9, 10 and 12 weeks, respectively. CSF formation was reduced 57% by intraventricular infusion of the carbonic anhydrase inhibitor, acetazolamide. COMPARISON WITH EXISTING

methodsTracer dilution methods do not permit ongoing real-time determination of the rate of CSF formation, are not readily amenable to pharmacological manipulations, and require critical assumptions. Direct measurement of CSF formation overcomes these limitations.

conclusionsDirect measurement of CSF formation in rats is feasible. Our method should prove useful for studying CSF dynamics in normal physiology and disease models.

Indexed as

HydrodynamicsAnimalsCatheterizationCerebral AqueductCerebral VentriclesCerebrospinal FluidMaleRatsRats, WistarAcetazolamideCSF formationMethod

Identifiers

PMID25554415
PMCPMC4323871
OpenAlexW2046489823

What OpenQuestion holds

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Read underepoch 390

Registered trials

None linked

Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.