title: [McArdle disease: report of four brothers with myophosphorylase deficiency].
abstract: Myophosphorylase deficiency, or McArdle disease, is an uncommon entity. The gene for human myophosphorylase has been cloned and is located on chromosome 11, in keeping with the autosomal recessive nature of the disease and there is an excess of male patients. The diagnosis is established by documentation of elevated glycogen content and reduced phosphorylase activity in biopsied muscle tissue. We report four cases with McArdle disease which were 16, 15, 11 and 5 years old. They were brothers, and they came to the hospital because of pain, cramps and myoglobinuria after exercise or infection; in the first case, a male patient, myoglobinuria caused acute renal failure. Three of them showed reduced phosphorylase activity in biopsied muscle tissue. We discuss the different therapeutic possibilities.
authors.affiliation: Servicio de Medicina del Aparato Digestivo, Hospital Universitario Virgen de la Arrixaca, Ctra. Cartagena-Murcia s/n. 30120 El Palmar, Murcia.
authors.forename: A
authors.initials: A
authors.lastname: López Martín
authors.forename: R I
authors.initials: RI
authors.lastname: Baños Madrid
authors.forename: J
authors.initials: J
authors.lastname: García-Estañ Candela
authors.forename: B
authors.initials: B
authors.lastname: García Pérez
authors.forename: F J
authors.initials: FJ
authors.lastname: Pérez Bautista
authors.forename: P
authors.initials: P
authors.lastname: Salmerón
mesh_terms: D000293:Adolescent; D002648:Child; D006012:Glycogen Storage Disease Type V / Q000175:diagnosis* / Q000201:enzymology / Q000235:genetics*; D006801:Humans; D008297:Male; D006005:Phosphorylases / Q000172:deficiency
chemical_list: D006005:Phosphorylases