Document Detail

Epidemiological study of myasthenia gravis in the province of Reggio Emilia, Italy.
MedLine Citation:
PMID:  9690757     Owner:  NLM     Status:  MEDLINE    
We carried out a retrospective incidence, prevalence and mortality survey of myasthenia gravis in the province of Reggio Emilia in Northern Italy. Based on 49 patients, the mean incidence per year for the period 1980 through 1994 was 7.8 per 1,000,000. On 31 December 1994 the prevalence rate was 117.5 per 1,000,000 for all patients, either active or recovered (50 cases in a population of 427,493) and 103.4 per 1,000,000 for the active disease. In the 15-year period 1980-1994 the average mortality rate was 1.0 per 1,000,000 per year. The average age at onset was 44.6 +/- 21.0, and the average age at the time of prevalence determination was 51.1 +/- 19.6 for the active disease. At the time of diagnosis, 21 patients (36.8%) were classed in group I according to Osserman's criteria, 31 in group II (54.4%), (19 in group II-A and 12 in group II-B), and the other 5 (8.8%) in group III. Of all the prevalence cases, 6 (12%) were in remission without therapy and 6 with therapy, while most of the others 16 (32%) were classed in group I, 15 (30%) in group II, and 1 (2%) in group III. Thymectomy was performed in 20 patients (35.1%), 12 (21%) had thymoma (malignant in 4 cases), 6 had thymic hyperplasia while in two patients thymic histology was normal. The relation the grade of Osserman's scale at the time of incidence and the presence of thymoma were significant. Higher grades of Osserman's scale were associated were malignant thymoma. Furthermore the relationship between thymectomy and the grade of Osserman's scale at the date of prevalence was significant for the presence of lower grades of Osserman's scale in the patients submitted to thymectomy.
D Guidetti; R Sabadini; M Bondavalli; S Cavalletti; M Lodesani; R Mantegazza; V Cosi; F Solime
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  European journal of epidemiology     Volume:  14     ISSN:  0393-2990     ISO Abbreviation:  Eur. J. Epidemiol.     Publication Date:  1998 Jun 
Date Detail:
Created Date:  1998-10-16     Completed Date:  1998-10-16     Revised Date:  2007-07-11    
Medline Journal Info:
Nlm Unique ID:  8508062     Medline TA:  Eur J Epidemiol     Country:  NETHERLANDS    
Other Details:
Languages:  eng     Pagination:  381-7     Citation Subset:  IM    
Neurological Division, Santa Maria Nuova Hospital, Reggio Emilia, Italy.
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MeSH Terms
Age Distribution
Analysis of Variance
Child, Preschool
Data Collection
Italy / epidemiology
Middle Aged
Myasthenia Gravis / classification,  epidemiology*
Poisson Distribution
Retrospective Studies
Risk Factors
Rural Population
Sex Distribution
Survival Rate

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