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Reducing Body Myopathy


Presentation

  • Histologically, reducing bodies contain a substance that can reduce dihydroxydinaphthyl disulfide, confirming that sulfhydryl groups are present.[medlink.com]
  • The features described expand the clinical presentation of this myopathy, and may lead to a better understanding of its etiology.[ncbi.nlm.nih.gov]
  • Neuromuscular syndromes are presented clinically either as a case study or as an overview from the literature, accompanied by text presenting molecular defects, and differential diagnosis.[books.google.com]
Death in Childhood
  • Death in childhood is frequent in the severe form of the disease, due to respiratory failure.[uniprot.org]
Severe Clinical Course
  • All mutations in this residue were de novo and were associated with a severe clinical course, in particular in one male patient (H123Q).[ncbi.nlm.nih.gov]
Muscle Rigidity
  • Malignant Hyperthermia Malignant hyperthermia is a severe reaction to anesthetic agents and depolarizing muscle-blocking agents that manifests as muscle rigidity, fever, muscle necrosis, myoglobinuria, metabolic acidosis, kidney failure, and cardiac arrhythmias[clevelandclinicmeded.com]
Mitral Valve Prolapse
  • She is, to our knowledge, the oldest reported case and the only patient described with severe mitral valve prolapse and scoliosis.[ncbi.nlm.nih.gov]
Myopathy
  • Our aim was to define the clinical and morphological phenotype of this myopathy and to assess the mutational spectrum of FHL1 mutations in reducing body myopathy in a larger cohort of patients.[ncbi.nlm.nih.gov]
Flexion Contracture
  • At the age of five years a male child started to develop a progressive rigid spine, torsion scoliosis, and flexion contractures of his elbows, knees, hips, and ankles owing to severe proximal and distal muscle weakness.[ncbi.nlm.nih.gov]
  • Distal arthrogryposis has also been described as due to a mutation in TPM2 .20 Presentation is at birth with flexion contractures of hands and feet.[emedicine.medscape.com]
Hand Enlargement
  • On the other hand, enlarged densely stained myonuclei, in addition to the presence of many reducing bodies, were striking on light microscopy, and chromatin condensation was seen on electron microscopy.[ncbi.nlm.nih.gov]
Psychomotor Retardation
  • She developed at 10 months a psychomotor retardation with short and stiff neck, a progressive malignant scoliosis with axial and proximal muscle weakness, pelvic stiffness and shoulder girdles. She presents asymmetric hypertrophic cardiomyopathy.[medworm.com]
  • retardation and characteristic facies-2 , see UNC80 deficiency infantile leukoencephalopathy and megalencephaly , see Megalencephalic leukoencephalopathy with subcortical cysts Infantile Multiple Carboxylase Deficiency , see Holocarboxylase synthetase[herenciageneticayenfermedad.blogspot.com]
Onset in Infancy or Childhood
  • […] in those with RYR1 mutations Core–rod myopathy AD/AR AR AD α-Actin 1 ( ACTA1 ) Nebulin ( NEB ) Kelch repeat and BTB/ ( KBTBD13 ) Onset in infancy or childhood.[neurology.mhmedical.com]
Abnormal Gait
  • Common features included frequent falls, abnormal gait, progressive proximal muscle weakness, contractures, and scoliosis. There were 4 girls and 1 boy, who was the most severely affected.[omim.org]

Workup

  • After complete workup, its frequency fell to 14%.[nature.com]
  • BAG3 should be included in the genetic workup of MFM patients, even in cases with an adult onset and a mild phenotype.[ojrd.biomedcentral.com]
Muscle Biopsy showing Inclusion Bodies
  • In both girls, serum creatine kinase was increased, and skeletal muscle biopsies showed inclusion bodies that stained with NBT.[omim.org]

Treatment

  • Part one discusses the approach to neuromuscular disorders, covering principles and basics, neuromuscular investigations, and assessment and treatment of neurological disorders.[books.google.com]
  • CLOSE Medical Disclaimer The medical information on this site is provided as an information resource only, and is not to be used or relied on for any diagnostic or treatment purposes.[diseaseinfosearch.org]
  • Management and treatment Management is supportive and should be multidisciplinary (involving a neurologist, orthopaedic surgeon and physical therapist).[orpha.net]

Prognosis

  • Prognosis The prognosis is generally severe: disease progression results in loss of ambulation, and death due to respiratory failure occurs even in patients with later-onset slowly progressive forms of the disease. Last updated: 4/28/2008[rarediseases.info.nih.gov]
  • Prognosis The prognosis is generally severe: disease progression results in loss of ambulation, and death due to respiratory failure occurs even in patients with later-onset slowly progressive forms of the disease.[orpha.net]
  • Progressive dysphagia is associated with a poorer prognosis and a poorer quality of life.[patient.info]
  • Treatment and prognosis At the time of writing there is no definitive cure nor a standard course of treatment for Inclusion body myositis. The disease is generally unresponsive to corticosteroids and immunosuppressive drugs 4.[radiopaedia.org]
  • […] muscles Difficulty with walking Weakness of upper leg muscles, hips, shoulders, and hands Usually no weakening of muscles on the front of thighs (quadriceps) Normal or slightly elevated creatine kinase levels No muscle weakness in the eyes or heart Prognosis[evolvegene.com]

Etiology

  • The features described expand the clinical presentation of this myopathy, and may lead to a better understanding of its etiology.[ncbi.nlm.nih.gov]
  • Etiology Both sporadic and familial cases of RBM are caused by mutations in the gene encoding the four-and-a-half LIM domain 1 protein ( FHL1 ; Xq27.2).[rarediseases.info.nih.gov]
  • Rhabdomyolysis may also be seen with infectious etiologies, alcohol, and toxic exposures.[clevelandclinicmeded.com]
  • The treatment entails preventing other complications such as aspiration, and addressing the etiology more specifically.[nature.com]

Epidemiology

  • Epidemiology The prevalence is unknown: although some sporadic cases have been described, only four families with RBM have been reported in the literature so far.[rarediseases.info.nih.gov]
  • Summary Epidemiology The prevalence is unknown: although some sporadic cases have been described, only four families with RBM have been reported in the literature so far.[orpha.net]
  • Interest has been stimulated by the finding that substances deposited in muscle are similar to those found in the brain in Alzheimer's disease - eg, amyloid precursor proteins. [ 7, 8 ] Epidemiology [ 1 ] Most cases present in patients aged over 50 years[patient.info]
  • Table 1 Clinical Features of Common Myopathies Myopathy Epidemiology Distribution of Weakness Other Systemic Manifestations Acquired Myopathies Dermatomyositis Female male Peak incidence: children and ages 40–60 yr Symmetrical proximal muscle weakness[clevelandclinicmeded.com]
  • Epidemiology of inclusion body myositis in the Netherlands: a nationwide study. Neurology. 2000;55:1385-1387 3 Phillips BA, Zilko PJ, Mastaglia FL. Prevalence of sporadic inclusion body myositis in Western Australia.[s-ibm.org]
Sex distribution
Age distribution

Pathophysiology

  • This genetic progress has uncovered crucial pathophysiological concepts, thus redefining clinical phenotypes.[ncbi.nlm.nih.gov]
  • Although the pathophysiology remains poorly understood, inclusions may be involved in processing and assembling ribosomes.[medlink.com]
  • […] novel technique to assess muscle velocity recovery cycles (MVRC) that provides information on the polarisation state and T-tubule function of myocytes. 1 This study aimed to identify differences in MVRC parameters in sIBM patients that could provide pathophysiological[jnnp.bmj.com]
  • Magnesium deficiency: pathophysiologic and clinical overview. Am J Kidney Dis 24: 737 - 752, 1994. Dorup I. Magnesium and potassium deficiency.[arklatexurology.com]
  • General Pathophysiology Inherited, Autosomal Dominant In myotonic dystrophy 1 (DM1) the CTG repeats on Chromosome 19 affect the 3’ untranslated region of the myotonic dystrophy protein kinase gene (DMPK), causing a decreased expression of the protein.[eyewiki.aao.org]

Prevention

  • How can cardiomyopathy be prevented? You cannot prevent inherited types of cardiomyopathy.[heart.org]
  • INTRODUCTION Statins are the primary class of medication used to lower serum cholesterol concentration for both primary and secondary prevention of coronary disease.[uptodate.com]
  • Preventive treatment for permanent contraction of a muscle ( contractures ) includes physical therapy and bracing. There are currently no drugs available to prevent or treat contractures.[healthcommunities.com]
  • Prevention As of 2004 there is no way to prevent the genetic mutations that cause myopathies, nor are there ways to prevent metabolic and endocrine failures that result in myopathies.[healthofchildren.com]
  • Because patients taking prednisone are at risk for osteoporosis, they should receive proper treatment to prevent it.[rheumatology.org]

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