Evidence map›Paper›PMID 24890032›Full record

ArticlePharmacoepidemiology and drug safety2014

Is sodium valproate, an HDAC inhibitor, associated with reduced risk of stroke and myocardial infarction? A nested case-control study.

Alex Dregan, Judith Charlton, Charles D A Wolfe, Martin C Gulliford, Hugh S Markus

Open access · hybridAbstract read
In one paragraph

Article in Pharmacoepidemiology and drug safety, 2014. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 19 papers, 2 of them syntheses that pooled it.

0numbers the graph read from it
0cells of the map it votes in
19citing papers in PubMed, 2 pooled it
11.1field-weighted citation impact, top 2% 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, 2 syntheses or guidelines pooled it, 50 citations in OpenAlex.

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  11. Dual mechanisms for the regulation of brain-derived neurotrophic factor by valproic acid in neural progenitor cells.The Korean journal of physiology & pharmacology : official journal of the Korean Physiological Society and the Korean Society of Pharmacology · 2018
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  15. The relationship between prior antimicrobial prescription and meningitis: a case-control study.The British journal of general practice : the journal of the Royal College of General Practitioners · 2016
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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

5 authors at 3 institutions in 1 country.

Alex DreganDepartment of Primary Care and Public Health Sciences, King's College London, London, UK; NIHR Biomedical Research Centre at Guy's and St Thomas' NHS Foundation Trust and King's College London, London, UK.
Judith Charlton
Charles D A Wolfe
Martin C Gulliford
Hugh S Markus
Guy's and St Thomas' NHS Foundation Trust · GBKing's College London · GBUniversity of Cambridge · GB

Funding

British Heart Foundation CRM:0006031British Heart Foundation PG/13/30/30005Department of Health RP-PG-0407-10184
6 · The paper itself

Abstract

backgroundThis study aimed to evaluate whether treatment with sodium valproate (SV) was associated with reduced risk of stroke or myocardial infarction (MI).

methodsElectronic health records data were extracted from Clinical Practice Research Database for participants ever diagnosed with epilepsy and prescribed antiepileptic drugs. A nested case-control study was implemented with cases diagnosed with incident non-haemorrhagic stroke and controls matched for sex, year of birth, and study start date (ratio of 1:6). A second nested study was implemented with MI as outcome. The main exposure variable was SV therapy assessed as: ever prescribed, pre-stroke year treatment, number of SV prescriptions, and cumulative time on SV drug therapy. Odds ratios were estimated using conditional logistic regression.

resultsData were analysed for 2002 stroke cases and 13,098 controls. MI analyses included 1153 cases and 7109 controls. Pre-year stroke SV treatment (28%) was associated with increased stroke risk (odds ratio 1.22, 95% confidence interval (CI): 1.09 to 1.38, p < 0.001). No association was observed between ever being prescribed SV with ischemic stroke (OR = 1.01, 95% CI: 0.91 to 1.12, p = 0.875). A significant association was observed between ever being prescribed SV with MI (OR = 0.78, 95% CI: 0.67 to 0.90, p < 0.001). Patients in the highest quarter of SV treatment duration had lower odds of ischemic stroke (OR = 0.57, 95% CI: 0.44 to 0.72, p < 0.001) and MI (OR = 0.29, 95% CI: 0.20 to 0.44, p < 0.001).

conclusionSodium valproate exposure was associated with the risk of MI, but not ischemic stroke. However, longer exposure to SV was associated with lower odds of stroke, but this might be explained by survivor bias.

Indexed as

AgedAged, 80 and overBiasBrain IschemiaCase-Control StudiesDatabases, FactualElectronic Health RecordsEpilepsyFemaleHistone Deacetylase InhibitorsHumansLogistic ModelsMaleMiddle AgedMyocardial InfarctionRiskHistone Deacetylase InhibitorsValproic Acidantiepileptic drugsepilepsyhistone deacetylase (HDAC) inhibitorsischemic strokemyocardial infarctionpharmacoepidemiologysodium valproate

Identifiers

PMID24890032
PMCPMC4312949
OpenAlexW2158817341

What OpenQuestion holds

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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.