title: Idiopathic lactic acidemia with developmental delay and type 1 muscle fiber atrophy: report of two patients.
abstract: Two infants with generalized muscle hypotonia with mild muscle weakness and markedly delayed developmental milestones, had high lactate levels in serum and cerebrospinal fluid from early infancy. Biochemical and morphologic studies of biopsied muscles disclosed no abnormality except for type 1 fiber atrophy, which was quite different from patients with central nervous involvement with type 2 fiber atrophy. In both patients, the disease was not progressive and lactate levels gradually decreased. Although no metabolic defect was found, these patients probably shared common pathogenetic mechanism.
authors.affiliation: Division of Child Neurology, National Center Hospital for Mental, Nervous and Muscular Disorders, Tokyo, Japan.
authors.forename: A
authors.initials: A
authors.lastname: Iso
authors.forename: N
authors.initials: N
authors.lastname: Murakami
authors.forename: H
authors.initials: H
authors.lastname: Yoneyama
authors.forename: S
authors.initials: S
authors.lastname: Hanaoka
authors.forename: T
authors.initials: T
authors.lastname: Kurokawa
authors.forename: I
authors.initials: I
authors.lastname: Nonaka
mesh_terms: D000140:Acidosis, Lactic / Q000150:complications* / Q000000981:diagnostic imaging / Q000473:pathology; D004453:Echoencephalography; D005260:Female; D006801:Humans; D007231:Infant, Newborn; D007773:Lactates / Q000097:blood; D009132:Muscles / Q000473:pathology; D009133:Muscular Atrophy / Q000150:complications* / Q000000981:diagnostic imaging / Q000473:pathology; D011773:Pyruvates / Q000097:blood; D013831:Thiamine / Q000627:therapeutic use
chemical_list: D007773:Lactates; D011773:Pyruvates; D013831:Thiamine