Evidence map›Paper›PMID 32993739›Full record

SynthesisJournal of cardiothoracic surgery2020

Assessment of the risks of a myasthenic crisis after thymectomy in patients with myasthenia gravis: a systematic review and meta-analysis of 25 studies.

Chaoying Liu, Peng Liu, Xiao Jing Zhang, Wen Qian Li, Guoyan Qi

Abstract readMeta-AnalysisSystematic Review
In one paragraph

Synthesis in Journal of cardiothoracic surgery, 2020. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 16 papers.

0numbers the graph read from it
0cells of the map it votes in
16citing papers in PubMed
–field-weighted citation impact
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

16 citing papers in PubMed.

  1. Myasthenia Gravis and Thymoma.Muscle & nerve · 2026
    Review
  2. Article
  3. Article
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  8. Review
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  15. Childhood-Onset Myasthenia Gravis Patients Benefited from Thymectomy in a Long-Term Follow-up Observation.European journal of pediatric surgery : official journal of Austrian Association of Pediatric Surgery ... [et al] = Zeitschrift fur Kinderchirurgie · 2022
    Article
  16. Thymectomy in Myasthenia Gravis: A Narrative Review.Saudi journal of medicine & medical sciences
    Review
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.

Chaoying LiuHebei Key Laboratory of Myasthenia Gravis, Center of Treatment of Myasthenia Gravis Hebei Province, First Hospital of Shijiazhuang, No. 9 Fangbei Road, Chang'an District, Shijiazhuang, 050011, Hebei Province, China.
Peng LiuHebei Key Laboratory of Myasthenia Gravis, Center of Treatment of Myasthenia Gravis Hebei Province, First Hospital of Shijiazhuang, No. 9 Fangbei Road, Chang'an District, Shijiazhuang, 050011, Hebei Province, China.
Xiao Jing ZhangHebei Key Laboratory of Myasthenia Gravis, Center of Treatment of Myasthenia Gravis Hebei Province, First Hospital of Shijiazhuang, No. 9 Fangbei Road, Chang'an District, Shijiazhuang, 050011, Hebei Province, China.
Wen Qian LiHebei Key Laboratory of Myasthenia Gravis, Center of Treatment of Myasthenia Gravis Hebei Province, First Hospital of Shijiazhuang, No. 9 Fangbei Road, Chang'an District, Shijiazhuang, 050011, Hebei Province, China.
Guoyan QiHebei Key Laboratory of Myasthenia Gravis, Center of Treatment of Myasthenia Gravis Hebei Province, First Hospital of Shijiazhuang, No. 9 Fangbei Road, Chang'an District, Shijiazhuang, 050011, Hebei Province, China. zzjwlsys@163.com.

Funding

Key Research of Medical Science Research of Hebei Province 20190165Special Project of Beijing-Tianjin-Hebei Basic Research Cooperation H2019106063the Shijiazhuang Science and Technology Bureau Foundation 171461553
6 · The paper itself

Abstract

backgroundDespite the burgeoning literature describing preoperative and postoperative risks of a myasthenic crisis after thymectomy (MCAT) in patients with myasthenia gravis, substantial differences exist in the risk factors identified by previous studies. We conducted a meta-analysis to assess the reported risk factors and MCAT risk.

methodsWe collected relevant studies on the risk factors for MCAT by searching the PubMed, Embase, The Cochrane Library, China Biology Medicine (CBM), WanFang Data, VIP and CNKI databases. The search period ranged from the establishment of the database to November 2019.

resultsTwenty-five of the 458 identified studies were eligible for the meta-analysis. Seven retrospective cohort studies and 18 case-control studies were included, and 14 risk factors for MCAT were extracted. Meta-analyses of the association between MCAT and risk factors related to the patient's preoperative condition included a preoperative history of MC, preoperative bulbar symptoms, IIa + IIb + III + VI, IIb + III + VI, VI + V, dosage of pyridostigmine bromide prior to the operation, a preoperative AchR-Ab level > 100 (nm/L), preoperative pulmonary function, preoperative complications, and preoperative disease course. Meta-analyses of the association between MCAT and surgery-related risk factors included intraoperative blood loss > 1000 mL and the mode of operation. Meta-analyses of the association between MCAT and postoperative risk factors included postoperative lung infection, thymoma and the WHO classification. The operation time was not an independent risk factor for MCAT.

conclusionsThe independent risk factors for MCAT were a preoperative history of MC, preoperative bulbar symptoms, preoperative MG Osserman stage, preoperative dosage of pyridostigmine bromide, preoperative serum AchR-Ab level, lung function, major postoperative complications, disease duration before thymectomy, blood loss, thoracotomy, postoperative lung infection, thymoma, and WHO classification.

Indexed as

Blood Loss, SurgicalDatabases, FactualFemaleHumansMaleMyasthenia GravisOperative TimePostoperative ComplicationsRisk FactorsThymectomyMeta-analysisMyasthenia gravisMyasthenic crisisRisksThymectomy

Identifiers

PMID32993739
PMCPMC7526111

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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.