Movement disorders in the eosinophilia-myalgia syndrome: tremor, myoclonus, and myokymia.

OBJECTIVE

To describe the development of tremor, myoclonus, and myokymia as chronic sequelae of eosinophilia-myalgia syndrome (EMS).

METHODS

Four patients among a cohort of 57 individuals with EMS followed prospectively were identified to have objective movement disorders. Electrophysiologic findings were assessed by recording of electromyographic activity from pairs of upper extremity antagonist muscles using 2 input channels.

RESULTS

Clinical and electrophysiologic studies documented the presence of tremor (4 patients), myoclonus (3 patients), and myokymia (1 patient) as late sequelae of EMS.

CONCLUSION

The recognition of these movement disorders extends the spectrum of chronic neurologic disease in EMS.