Evidence map›Paper›PMID 35025999›Full record

SynthesisEuropace : European pacing, arrhythmias, and cardiac electrophysiology : journal of the working groups on cardiac pacing, arrhythmias, and cardiac cellular electrophysiology of the European Society of Cardiology2022

Midodrine for the prevention of vasovagal syncope: a systematic review and meta-analysis.

Lucy Y Lei, Satish R Raj, Robert S Sheldon

Open access · bronzeAbstract readMeta-AnalysisSystematic Review
In one paragraph

Synthesis in Europace : European pacing, arrhythmias, and cardiac electrophysiology : journal of the working groups on cardiac pacing, arrhythmias, and cardiac cellular electrophysiology of the European Society of Cardiology, 2022. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 24 papers, 1 of them a synthesis that pooled it.

0numbers the graph read from it
0cells of the map it votes in
24citing papers in PubMed, 1 pooled it
4.8field-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

24 citing papers in PubMed, 1 synthesis or guideline pooled it, 32 citations in OpenAlex.

  1. Serotonin reuptake inhibition for the prevention of vasovagal syncope: a systematic review and meta-analysis.Clinical autonomic research : official journal of the Clinical Autonomic Research Society · 2023
    Pooled it
  2. Review
  3. Article
  4. Article
  5. Article
  6. Article
  7. Haemodynamic effects of fludrocortisone and midodrine in patients with symptoms due to hypotension.Clinical autonomic research : official journal of the Clinical Autonomic Research Society · 2025
    Article
  8. The Efficacy of Cardioneuroablation versus Midodrine in Patients with Vasovagal Syncope: Design and Rationale for the CAMPAIGN Trial.Journal of interventional cardiac electrophysiology : an international journal of arrhythmias and pacing · 2025
    Article
  9. Article
  10. Review
  11. Article
  12. Serotonin and vasovagal syncope.Clinical autonomic research : official journal of the Clinical Autonomic Research Society · 2024
    Review
  13. Review
  14. Article
  15. Mechanism-based therapy of non-cardiac syncope: a practical guide.Europace : European pacing, arrhythmias, and cardiac electrophysiology : journal of the working groups on cardiac pacing, arrhythmias, and cardiac cellular electrophysiology of the European Society of Cardiology · 2024
    Article
  16. Article
  17. Article
  18. Article
  19. A cross-sectional nationwide survey of guideline based syncope units in the Netherlands: the SU-19 score-a novel validation for best practices.Europace : European pacing, arrhythmias, and cardiac electrophysiology : journal of the working groups on cardiac pacing, arrhythmias, and cardiac cellular electrophysiology of the European Society of Cardiology · 2023
    Article
  20. Twenty-five years of research on syncope.Europace : European pacing, arrhythmias, and cardiac electrophysiology : journal of the working groups on cardiac pacing, arrhythmias, and cardiac cellular electrophysiology of the European Society of Cardiology · 2023
    Article
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

3 authors at 1 institution in 1 country.

Lucy Y LeiDepartment of Cardiac Sciences, Libin Cardiovascular Institute, Cumming School of Medicine, University of Calgary, GAA02 HRIC Building, 3280 Hospital Drive NW, Calgary, AB T2N 4Z6, Canada.ORCID 0000-0002-4036-7697
Satish R RajDepartment of Cardiac Sciences, Libin Cardiovascular Institute, Cumming School of Medicine, University of Calgary, GAA02 HRIC Building, 3280 Hospital Drive NW, Calgary, AB T2N 4Z6, Canada.ORCID 0000-0002-5890-3785
Robert S SheldonDepartment of Cardiac Sciences, Libin Cardiovascular Institute, Cumming School of Medicine, University of Calgary, GAA02 HRIC Building, 3280 Hospital Drive NW, Calgary, AB T2N 4Z6, Canada.ORCID 0000-0003-0742-8379
University of Calgary · CA

Funding

Vanderbilt Institute for Clinical and Translational Research (VICTR) -Identifying correlates of functional immunity in SARS-CoV-2 convalescent plasmaUL1TR002243 · NCATS · VANDERBILT UNIVERSITY MEDICAL CENTER · PI Paul A. Harris, Wesley H Self · 2017 to 2026
$130.7M
NCATS NIH HHS UL1 TR002243
6 · The paper itself

Abstract

aimsVasovagal syncope (VVS) is a common clinical condition that lacks effective medical therapies despite being associated with significant morbidity. Current guidelines suggest that midodrine, a prodrug for an α1-adrenergic receptor agonist, might suppress VVS but supporting studies have utilized heterogeneous methods and yielded inconsistent results. To evaluate the efficacy of midodrine to prevent syncope in patients with recurrent VVS by conducting a systematic review and meta-analysis of published studies. METHODS AND

resultsRelevant randomized controlled trials were identified from the MEDLINE, Embase, CENTRAL, and CINAHL databases without language restriction from inception to June 2021. All studies were conducted in clinical syncope populations and compared the benefit of midodrine vs. placebo or non-pharmacological standard care. Weighted relative risks (RRs) were estimated using random effects meta-analysis techniques. Seven studies (n = 315) met inclusion criteria. Patients were 33 ± 17 years of age and 31% male. Midodrine was found to substantially reduce the likelihood of positive head-up-tilt (HUT) test outcomes [RR = 0.37 (0.23-0.59), P < 0.001]. In contrast, the pooled results of single- and double-blind clinical trials (I2 = 54%) suggested a more modest benefit from midodrine for the prevention of clinical syncope [RR = 0.51 (0.33-0.79), P = 0.003]. The two rigorous double-blind, randomized, placebo-controlled clinical trials included 179 VVS patients with minimal between-study heterogeneity (I2 = 0%) and reported a risk reduction with midodrine [RR = 0.71 (0.53-0.95), P = 0.02].

conclusionsMidodrine is effective in preventing syncope induced by HUT testing and less, but still significant, RR reduction in randomized, double-blinded clinical trials.

Indexed as

MidodrineSyncope, VasovagalDouble-Blind MethodFemaleHumansMaleRandomized Controlled Trials as TopicSyncopeTilt-Table TestMidodrineMeta-analysisMidodrineRandomized clinical trialsSystematic reviewVasovagal syncope

Identifiers

PMID35025999
PMCPMC9301979
OpenAlexW4206804876

What OpenQuestion holds

Textmetadata
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.