Evidence map›Paper›PMID 32152347›Full record

ArticleScientific reports2020

Combined behavioral and electrophysiological evidence for a direct cortical effect of prefrontal tDCS on disorders of consciousness.

Bertrand Hermann, Federico Raimondo, Lukas Hirsch, Yu Huang, Mélanie Denis-Valente, Pauline Pérez, Denis Engemann, Frédéric Faugeras, Nicolas Weiss, Sophie Demeret and 4 more

Open access · goldAbstract read
In one paragraph

Article in Scientific reports, 2020. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 43 papers, 2 of them syntheses that pooled it.

0numbers the graph read from it
0cells of the map it votes in
43citing papers in PubMed, 2 pooled it
5.1field-weighted citation impact, top 4% 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, 2 syntheses or guidelines pooled it, 88 citations in OpenAlex.

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  15. Advances in Stroke Neurorehabilitation.Journal of clinical medicine · 2023
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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

14 authors at 4 institutions in 3 countries.

Bertrand HermannInstitut du Cerveau et de la Moelle épinière, ICM, F-75013, Paris, France.ORCID http://orcid.org/0000-0001-9071-3415
Federico RaimondoInstitut du Cerveau et de la Moelle épinière, ICM, F-75013, Paris, France.
Lukas HirschBiomedical Engineering Department, City College of the City University of New York, New York, NY, 10031, USA.
Yu HuangBiomedical Engineering Department, City College of the City University of New York, New York, NY, 10031, USA.
Mélanie Denis-ValenteInstitut du Cerveau et de la Moelle épinière, ICM, F-75013, Paris, France.
Pauline PérezInstitut du Cerveau et de la Moelle épinière, ICM, F-75013, Paris, France.
Denis EngemannParietal project-team, INRIA, Université Paris-Saclay, 91120, Saclay, France.ORCID http://orcid.org/0000-0002-7223-1014
Frédéric FaugerasInstitut du Cerveau et de la Moelle épinière, ICM, F-75013, Paris, France.
Nicolas WeissDepartment of Neurology, Neuro ICU, Hôpital de la Pitié-Salpêtrière, AP-HP, F-75013, Paris, France.ORCID http://orcid.org/0000-0001-5155-196X
Sophie DemeretDepartment of Neurology, Neuro ICU, Hôpital de la Pitié-Salpêtrière, AP-HP, F-75013, Paris, France.
Benjamin RohautInstitut du Cerveau et de la Moelle épinière, ICM, F-75013, Paris, France.
Lucas C ParraBiomedical Engineering Department, City College of the City University of New York, New York, NY, 10031, USA.ORCID http://orcid.org/0000-0003-4667-816X
Jacobo D Sitt *Institut du Cerveau et de la Moelle épinière, ICM, F-75013, Paris, France. jacobo.sitt@icm-institute.org.
Lionel Naccache *Institut du Cerveau et de la Moelle épinière, ICM, F-75013, Paris, France. lionel.naccache@gmail.com.
Centre National de la Recherche Scientifique · FRCity College of New York · USSorbonne Université · FRUniversité Paris-Sud · FR

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

Severe brain injuries can lead to long-lasting disorders of consciousness (DoC) such as vegetative state/unresponsive wakefulness syndrome (VS/UWS) or minimally conscious state (MCS). While behavioral assessment remains the gold standard to determine conscious state, EEG has proven to be a promising complementary tool to monitor the effect of new therapeutics. Encouraging results have been obtained with invasive electrical stimulation of the brain, and recent studies identified transcranial direct current stimulation (tDCS) as an effective approach in randomized controlled trials. This non-invasive and inexpensive tool may turn out to be the preferred treatment option. However, its mechanisms of action and physiological effects on brain activity remain unclear and debated. Here, we stimulated 60 DoC patients with the anode placed over left-dorsolateral prefrontal cortex in a prospective open-label study. Clinical behavioral assessment improved in twelve patients (20%) and none deteriorated. This behavioral response after tDCS coincided with an enhancement of putative EEG markers of consciousness: in comparison with non-responders, responders showed increases of power and long-range cortico-cortical functional connectivity in the theta-alpha band, and a larger and more sustained P300 suggesting improved conscious access to auditory novelty. The EEG changes correlated with electric fields strengths in prefrontal cortices, and no correlation was found on the scalp. Taken together, this prospective intervention in a large cohort of DoC patients strengthens the validity of the proposed EEG signatures of consciousness, and is suggestive of a direct causal effect of tDCS on consciousness.

Indexed as

Electrophysiological PhenomenaAdolescentAdultAgedAged, 80 and overBrainCase-Control StudiesConsciousness DisordersElectroencephalographyFemaleFollow-Up StudiesHumansMaleMiddle AgedPrefrontal CortexPrognosis

Identifiers

PMID32152347
PMCPMC7062738
OpenAlexW3009954431

What OpenQuestion holds

Textmetadata
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.