Nationwide survey of Lambert-Eaton myasthenic syndrome in Japan

Nationwide survey of Lambert-Eaton myasthenic syndrome in Japan

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Background There was no nationwide epidemiological study of Lambert-Eaton myasthenic syndrome (LEMS) in Japan; therefore, we conducted a nationwide survey.Methods For the first survey, we sent survey sheets to randomly selected medical departments (n=7545) to obtain the number of LEMS who visited medical departments between 1 January 2017 and 31 December 2017.For the second survey, we sent survey sheets to the corresponding medical departments to obtain clinical information on LEMS.Results We received 2708 responses (recovery rate: 35.

9%) to the first survey.We estimated Litter Pans the number of LEMS as 348 (95% CI 247 to 449).The prevalence was 2.7 (95% CI 1.

9 to 3.5) in 1 000 000 population.As a result of the second survey, we obtained 30 case records of 16 men and 14 women.Fourteen patients (46.

7%) had a tumour, and 10 out of 14 tumours were small-cell lung carcinoma (71.4%).There was a predominance of men in the LEMS with tumour (paraneoplastic LEMS, P-LEMS) (n=11, 78.6%) and women in the LEMS without tumour (a primary autoimmune form of LEMS, AI-LEMS) (n=11, 68.

8%) (p=0.0136).The onset age (mean (SD)) for the P-LEMS was 67.1 (9.

0), and that for AI-LEMS was 57.8 AGE-DEFYING DAY CREME (11.2) years old (p=0.0103).

The disease duration (median) for P-LEMS was 2 years, and for AI-LEMS was 7.5 years (p=0.0134).Conclusions The prevalence of LEMS in Japan is similar to that in other countries.

There are predominances of men in P-LEMS and women in AI-LEMS.