Evidence map›Paper›PMID 34875880›Full record

ArticleCephalalgia : an international journal of headache2022

Headache provocation by nitric oxide in men who have never experienced a headache.

Isa Amalie Olofsson, Katrine Falkenberg, Jes Olesen, Thomas Folkmann Hansen

Open access · greenAbstract read
In one paragraph

Article in Cephalalgia : an international journal of headache, 2022. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 4 papers.

0numbers the graph read from it
0cells of the map it votes in
4citing papers in PubMed
0.8field-weighted citation impact, top 29% 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

4 citing papers in PubMed, 5 citations in OpenAlex.

  1. Review
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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

4 authors at 1 institution in 1 country.

Isa Amalie OlofssonDepartment of Neurology, Danish Headache Center, Copenhagen University Hospital, Denmark.ORCID 0000-0002-7500-8045
Katrine FalkenbergDepartment of Neurology, Danish Headache Center, Copenhagen University Hospital, Denmark.
Jes OlesenDepartment of Neurology, Danish Headache Center, Copenhagen University Hospital, Denmark.
Thomas Folkmann HansenDepartment of Neurology, Danish Headache Center, Copenhagen University Hospital, Denmark.
Copenhagen University Hospital · DK

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

introductionIn the general population 4% have never experienced a headache. Freedom from headache could be due to distinctive protective mechanisms or a lack of environmental risk factors for headache. Isosorbide-5-mononitrate is an organic nitrate which in the body is metabolised to nitric oxide. The nitric oxide pathway plays a crucial role in the primary headaches. We hypothesized that people who are free from headache are protected by distinctive mechanisms in the nitric oxide pathway.

methodsWe performed an observer blinded case-control study using nitric oxide to provoke a headache. 32 headache free male participants and 26 randomly selected male controls received 60 mg Isosorbide-5-mononitrate orally on the study day. Participants fill out a headache diary with headache intensity and characteristics until 12 hours after administration of Isosorbide-5-mononitrate. Primary endpoint were areas under the curve of headache intensity score.

resultsAll 58 participants completed the study. There was no significant difference in headache incidence, headache intensity score or migraine-like attack between headache free participants and controls.

conclusionWe show that men who have never experienced a headache develop a headache when provoked with Isosorbide-5-mononitrate. This indicates that freedom from headache in men is not related to the nitric oxide pathway which is involved in the primary headache disorders.

Indexed as

Cervical RipeningNitric OxideCase-Control StudiesFemaleHeadacheHumansIsosorbide DinitrateMaleNitric Oxide DonorsPregnancyIsosorbide DinitrateNitric OxideNitric Oxide Donorsisosorbide-5-mononitratemigrainenever had headachepathwayprotective mechanismsProvocation study

Identifiers

PMID34875880
PMCPMC9109242
OpenAlexW4200526654

What OpenQuestion holds

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LicenceCC BY-NC
Read underepoch 390

Registered trials

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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.