A systematic review of population based epidemiological studies in Myasthenia Gravis

Aisling S. Carr*, Christopher Cardwell, Peter McCarron, John McConville

*Corresponding author for this work

Research output: Contribution to journalLiterature review

237 Citations (Scopus)

Abstract

Background: The aim was to collate all myasthenia gravis (MG) epidemiological studies including AChR MG and MuSK MG specific studies. To synthesize data on incidence rate (IR), prevalence rate (PR) and mortality rate (MR) of the condition and investigate the influence of environmental and technical factors on any trends or variation observed.

Methods: Studies were identified using multiple sources and meta-analysis performed to calculate pooled estimates for IR, PR and MR.

Results: 55 studies performed between 1950 and 2007 were included, representing 1.7 billion population-years. For All MG estimated pooled IR (eIR): 5.3 per million person-years (C.I.: 4.4, 6.1), range: 1.7 to 21.3; estimated pooled PR: 77.7 per illion persons (C.I.: 64.0, 94.3), range 15 to 179; MR range 0.1 to 0.9 per millions person-years. AChR MG eIR: 7.3 (C.I.: 5.5, 7.8), range: 4.3 to 18.0; MuSK MG IR range: 0.1 to 0.32. However marked variation persisted between populations studied with similar methodology and in similar areas.

Conclusions: We report marked variation in observed frequencies of MG. We show evidence of increasing frequency of MG with year of study and improved study quality. This probably reflects improved case ascertainment. But other factors must also influence disease onset resulting in the observed variation in IR across geographically and genetically similar populations.

Original languageEnglish
Article number46
Number of pages9
JournalBMC Neurology
Volume10
DOIs
Publication statusPublished - 18 Jun 2010

Keywords

  • ACETYLCHOLINE-RECEPTOR ANTIBODIES
  • NEUROLOGICAL DISEASES
  • PREVALENCE
  • DENMARK
  • PROVINCE
  • ONSET
  • SARDINIA
  • COUNTY

Cite this

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title = "A systematic review of population based epidemiological studies in Myasthenia Gravis",
abstract = "Background: The aim was to collate all myasthenia gravis (MG) epidemiological studies including AChR MG and MuSK MG specific studies. To synthesize data on incidence rate (IR), prevalence rate (PR) and mortality rate (MR) of the condition and investigate the influence of environmental and technical factors on any trends or variation observed.Methods: Studies were identified using multiple sources and meta-analysis performed to calculate pooled estimates for IR, PR and MR.Results: 55 studies performed between 1950 and 2007 were included, representing 1.7 billion population-years. For All MG estimated pooled IR (eIR): 5.3 per million person-years (C.I.: 4.4, 6.1), range: 1.7 to 21.3; estimated pooled PR: 77.7 per illion persons (C.I.: 64.0, 94.3), range 15 to 179; MR range 0.1 to 0.9 per millions person-years. AChR MG eIR: 7.3 (C.I.: 5.5, 7.8), range: 4.3 to 18.0; MuSK MG IR range: 0.1 to 0.32. However marked variation persisted between populations studied with similar methodology and in similar areas.Conclusions: We report marked variation in observed frequencies of MG. We show evidence of increasing frequency of MG with year of study and improved study quality. This probably reflects improved case ascertainment. But other factors must also influence disease onset resulting in the observed variation in IR across geographically and genetically similar populations.",
keywords = "ACETYLCHOLINE-RECEPTOR ANTIBODIES, NEUROLOGICAL DISEASES, PREVALENCE, DENMARK, PROVINCE, ONSET, SARDINIA, COUNTY",
author = "Carr, {Aisling S.} and Christopher Cardwell and Peter McCarron and John McConville",
year = "2010",
month = "6",
day = "18",
doi = "10.1186/1471-2377-10-46",
language = "English",
volume = "10",
journal = "BMC Neurology",
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}

A systematic review of population based epidemiological studies in Myasthenia Gravis. / Carr, Aisling S.; Cardwell, Christopher; McCarron, Peter; McConville, John.

In: BMC Neurology, Vol. 10, 46, 18.06.2010.

Research output: Contribution to journalLiterature review

TY - JOUR

T1 - A systematic review of population based epidemiological studies in Myasthenia Gravis

AU - Carr, Aisling S.

AU - Cardwell, Christopher

AU - McCarron, Peter

AU - McConville, John

PY - 2010/6/18

Y1 - 2010/6/18

N2 - Background: The aim was to collate all myasthenia gravis (MG) epidemiological studies including AChR MG and MuSK MG specific studies. To synthesize data on incidence rate (IR), prevalence rate (PR) and mortality rate (MR) of the condition and investigate the influence of environmental and technical factors on any trends or variation observed.Methods: Studies were identified using multiple sources and meta-analysis performed to calculate pooled estimates for IR, PR and MR.Results: 55 studies performed between 1950 and 2007 were included, representing 1.7 billion population-years. For All MG estimated pooled IR (eIR): 5.3 per million person-years (C.I.: 4.4, 6.1), range: 1.7 to 21.3; estimated pooled PR: 77.7 per illion persons (C.I.: 64.0, 94.3), range 15 to 179; MR range 0.1 to 0.9 per millions person-years. AChR MG eIR: 7.3 (C.I.: 5.5, 7.8), range: 4.3 to 18.0; MuSK MG IR range: 0.1 to 0.32. However marked variation persisted between populations studied with similar methodology and in similar areas.Conclusions: We report marked variation in observed frequencies of MG. We show evidence of increasing frequency of MG with year of study and improved study quality. This probably reflects improved case ascertainment. But other factors must also influence disease onset resulting in the observed variation in IR across geographically and genetically similar populations.

AB - Background: The aim was to collate all myasthenia gravis (MG) epidemiological studies including AChR MG and MuSK MG specific studies. To synthesize data on incidence rate (IR), prevalence rate (PR) and mortality rate (MR) of the condition and investigate the influence of environmental and technical factors on any trends or variation observed.Methods: Studies were identified using multiple sources and meta-analysis performed to calculate pooled estimates for IR, PR and MR.Results: 55 studies performed between 1950 and 2007 were included, representing 1.7 billion population-years. For All MG estimated pooled IR (eIR): 5.3 per million person-years (C.I.: 4.4, 6.1), range: 1.7 to 21.3; estimated pooled PR: 77.7 per illion persons (C.I.: 64.0, 94.3), range 15 to 179; MR range 0.1 to 0.9 per millions person-years. AChR MG eIR: 7.3 (C.I.: 5.5, 7.8), range: 4.3 to 18.0; MuSK MG IR range: 0.1 to 0.32. However marked variation persisted between populations studied with similar methodology and in similar areas.Conclusions: We report marked variation in observed frequencies of MG. We show evidence of increasing frequency of MG with year of study and improved study quality. This probably reflects improved case ascertainment. But other factors must also influence disease onset resulting in the observed variation in IR across geographically and genetically similar populations.

KW - ACETYLCHOLINE-RECEPTOR ANTIBODIES

KW - NEUROLOGICAL DISEASES

KW - PREVALENCE

KW - DENMARK

KW - PROVINCE

KW - ONSET

KW - SARDINIA

KW - COUNTY

U2 - 10.1186/1471-2377-10-46

DO - 10.1186/1471-2377-10-46

M3 - Literature review

VL - 10

JO - BMC Neurology

JF - BMC Neurology

SN - 1471-2377

M1 - 46

ER -