title: [Imaging techniques and electromyography in inflammatory myopathies].
abstract: Different imaging techniques are used for the diagnosis, evaluation and follow-up of inflammatory myopathies; of these techniques, the ones that provide the largest amount of information are ultrasonography and magnetic resonance imaging. Electrodiagnosis in inflammatory myopathies is based mainly on electromyography (EMG), which shows different patterns according to the different disease presentations. In the acute phase, polyphasic potentials with diminished amplitude and duration are seen, whereas in its chronic phases, mixed neuropathic and myopathic patterns are found. After corticosteroid treatment, EMG tends to return to normal.
authors.affiliation: Departamento de Reumatología, Instituto Nacional de Rehabilitación, México D. F., México.
authors.forename: Angélica
authors.initials: A
authors.lastname: Peña Ayala
authors.forename: Rosa Elena
authors.initials: RE
authors.lastname: Escobar Cedillo
authors.forename: Rolando
authors.initials: R
authors.lastname: Espinosa Morales
authors.forename: Carlos
authors.initials: C
authors.lastname: Pineda Villaseñor