Evidence map›Paper›PMID 34244586›Full record

ArticleScientific reports2021

Head-nodding: a driving force for the circulation of cerebrospinal fluid.

Qiang Xu, Chang-Xi Shao, Ying Zhang, Yu Zhang, Cong Liu, Yu-Xiao Chen, Xue-Mei Wang, Yan-Yan Chi, Sheng-Bo Yu, Hong-Jin Sui

Open access · goldAbstract read
In one paragraph

Article in Scientific reports, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 19 papers.

0numbers the graph read from it
0cells of the map it votes in
19citing papers in PubMed
1.2field-weighted citation impact, top 24% 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

19 citing papers in PubMed, 21 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

10 authors at 4 institutions in 1 country.

Qiang Xu *Department of Anatomy, Dalian Medical University, Dalian, 116044, China.
Chang-Xi Shao *Department of Anatomy, Dalian Medical University, Dalian, 116044, China.
Ying Zhang *Graduate School, Dalian Medical University, Dalian, 116044, China.
Yu ZhangGraduate School, Dalian Medical University, Dalian, 116044, China.
Cong LiuDepartment of Anatomy, Dalian Medical University, Dalian, 116044, China.
Yu-Xiao ChenGraduate School, Dalian Medical University, Dalian, 116044, China.
Xue-Mei WangDepartment of Radiology, Dalian Municipal Central Hospital, Dalian, 116033, China.
Yan-Yan ChiDepartment of Anatomy, Dalian Medical University, Dalian, 116044, China.
Sheng-Bo YuDepartment of Anatomy, Dalian Medical University, Dalian, 116044, China. ysbdmu@126.com.
Hong-Jin SuiDepartment of Anatomy, Dalian Medical University, Dalian, 116044, China. suihj@hotmail.com.
Dalian Medical University · CNBaoji City Central Hospital · CNDalian Municipal Central Hospital · CNPeople's Liberation Army 401 Hospital · CN

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

The myodural bridge (MDB) is a dense connective tissue bridge connecting the suboccipital muscles to the spinal dura mater, and it has been proven to be a normal common existing structure in humans and mammals. Some scholars believe that the suboccipital muscles can serve as a dynamic cerebrospinal fluid (CSF) pump via the MDB, and they found head rotations promote the CSF flow in human body, which provided evidence for this hypothesis. Head movement is a complex motion, but the effects of other forms of head movement on CSF circulation are less known. The present study explored the effects of head-nodding on CSF circulation. The CSF flow of 60 healthy volunteers was analyzed via cine phase-contrast magnetic resonance imaging at the level of the occipitocervical junction before and after one-minute-head-nodding period. Furthermore, the CSF pressures of 100 volunteers were measured via lumbar puncture before and after 5 times head-nodding during their anesthetizing for surgical preparation. As a result, it was found that the maximum and average CSF flow rates at the level of the upper border of atlas during ventricular diastole were significantly decreased from 1.965 ± 0.531 to 1.839 ± 0.460 ml/s and from 0.702 ± 0.253 to 0.606 ± 0.228 ml/s respectively. In the meantime, the changes in the ratio of cranial and caudal orientation of the net flow volume were found differed significantly after the one-minute-head-nodding period (p = 0.017). And on the other hand, the CSF pressures at the L3-L4 level were markedly increased 116.03 ± 26.13 to 124.64 ± 26.18 mmH

Indexed as

AdolescentAdultAgedBlood PressureCerebrospinal FluidFemaleHead MovementsHealthy VolunteersHumansMaleMiddle AgedNeurosciencesYoung Adult

Identifiers

PMID34244586
PMCPMC8270937
OpenAlexW3180721921

What OpenQuestion holds

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LicenceCC BY
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.