title: [Post exercise myalgias as presentation form of dystrophinopathy].
abstract: Cramps and myalgias are frequent presentations of many disorders whose diagnosis is generally difficult. Among the unusual causes stand the milder phenotypes of dystrophinopathies, which are caused, just as Duchenne and Becker's dystrophy, by mutations in the dystrophin gene. An 8 year-old boy presented severe muscle pain on exercise and serum rise in creatine kinase over 1000 U/l. He had normal muscle power and mild calf hypertrophy. The molecular analysis by polymerase chain reaction (PCR) of the dystrophin gene showed deletions of exons 45 to 51. Dystrophin analysis by Western blot revealed a dystrophin of reduced quantity and molecular weight. Emphasis is made to include dystrophinopathies in the differential diagnosis of myalgias and the usefulness of molecular genetic techniques in the identification of these disorders.
authors.affiliation: Servicio de Neuropsiquiatría Infantil, Hospital Clínico San Borja Arriarán. milklein@entelchile.net
authors.forename: K
authors.initials: K
authors.lastname: Kleinsteuber
authors.forename: P
authors.initials: P
authors.lastname: Rocco
authors.forename: L
authors.initials: L
authors.lastname: Herrera
authors.forename: M
authors.initials: M
authors.lastname: Vainzof
authors.forename: M E
authors.initials: ME
authors.lastname: Birke
authors.forename: M
authors.initials: M
authors.lastname: Yáñez
authors.forename: A
authors.initials: A
authors.lastname: Flandes
authors.forename: M
authors.initials: M
authors.lastname: Zatz
authors.forename: P
authors.initials: P
authors.lastname: de Carvallo
authors.forename: M A
authors.initials: MA
authors.lastname: Avaria
mesh_terms: D015153:Blotting, Western; D002648:Child; D003402:Creatine Kinase / Q000097:blood; D016189:Dystrophin / Q000235:genetics*; D015444:Exercise; D005091:Exons / Q000235:genetics; D017353:Gene Deletion; D006801:Humans; D008297:Male; D009136:Muscular Dystrophies / Q000150:complications* / Q000235:genetics; D010146:Pain / Q000209:etiology*; D016133:Polymerase Chain Reaction
chemical_list: D016189:Dystrophin; D003402:Creatine Kinase