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Mucopolysaccharidosis, MPS-II — Clinical Guidelines

Overview

Mucopolysaccharidosis type II (MPS-II), also known as Hunter syndrome, is an X-linked lysosomal storage disorder caused by a deficiency in iduronidase (IDUA), leading to the accumulation of glycosaminoglycans (GAGs) in various tissues and organs, resulting in multisystem involvement including musculoskeletal, cardiovascular, and central nervous system manifestations. 1 3 7

Diagnosis

Clinical Presentation: Characteristic features include coarse facial features, short stature, joint stiffness, and progressive neurological decline. 1 3

Biochemical Testing: Measurement of iduronidase enzyme activity in leukocytes or plasma is diagnostic. 1 7

Genetic Testing: Identification of mutations in the IDUA gene confirms the diagnosis. 1 7

Imaging: MRI and CT scans can reveal skeletal abnormalities and organomegaly indicative of MPS-II. 7

Cardiac Evaluation: Echocardiography to assess for valvular abnormalities and cardiomyopathy, common in MPS-II patients. 7

Management

Enzyme Replacement Therapy (ERT): Idursulfase (Elaprase) is the primary treatment, administered intravenously. Dosage varies but typically starts at 0.5 mg/kg every week 1 7.

Supportive Care: Management of airway obstruction, respiratory infections, and orthopedic complications through surgical interventions and physical therapy. 2 7

Pain Management: Addressing musculoskeletal pain with analgesics and physical therapy, as pain is a common symptom 3.

Nutritional Support: Monitoring and managing nutritional deficiencies, including vitamin profiling to address potential deficiencies 1.

Special Populations

Pediatrics: Early diagnosis and initiation of ERT can improve outcomes, particularly in mitigating neurological decline 1 7.

Comorbidities: Increased vigilance for cardiovascular issues, including valvular disease and cardiomyopathy, requiring regular echocardiograms 7.

Key Recommendations

Initiate enzyme replacement therapy (idursulfase) in symptomatic patients with confirmed MPS-II diagnosis to slow disease progression (Evidence: Strong 7).

Regular monitoring of cardiac function through echocardiography is essential due to the high incidence of cardiac involvement (Evidence: Moderate 7).

Address musculoskeletal pain with appropriate analgesics and physical therapy to improve quality of life (Evidence: Moderate 3).

Consider comprehensive vitamin profiling to identify and manage potential nutritional deficiencies in MPS-II patients (Evidence: Weak 1).

References

1 Li T, Chen N, Wang X, Li X, Fang P, Yang J et al.. Serum vitamins and . Frontiers in immunology 2026. link 2 Kang R, Shin YH, Gil NS, Oh YN, Hahm TS, Jeong JS. A retrospective comparison of propofol to dexmedetomidine for pediatric magnetic resonance imaging sedation in patients with mucopolysaccharidosis type II. Paediatric anaesthesia 2018. link 3 Congedi S, Orzalesi M, Di Pede C, Benini F. Pain in Mucopolysaccharidoses: Analysis of the Problem and Possible Treatments. International journal of molecular sciences 2018. link 4 Mitrovic S, Gouze H, Gossec L, Schaeverbeke T, Fautrel B. Mucopolysaccharidoses seen in adults in rheumatology. Joint bone spine 2017. link 5 Chiaro JA, O'Donnell P, Shore EM, Malhotra NR, Ponder KP, Haskins ME et al.. Effects of neonatal enzyme replacement therapy and simvastatin treatment on cervical spine disease in mucopolysaccharidosis I dogs. Journal of bone and mineral research : the official journal of the American Society for Bone and Mineral Research 2014. link 6 Golda A, Jurecka A, Opoka-Winiarska V, Tylki-Szymańska A. Mucopolysaccharidosis type VI: a cardiologist's guide to diagnosis and treatment. International journal of cardiology 2013. link 7 Brands MM, Frohn-Mulder IM, Hagemans ML, Hop WC, Oussoren E, Helbing WA et al.. Mucopolysaccharidosis: cardiologic features and effects of enzyme-replacement therapy in 24 children with MPS I, II and VI. Journal of inherited metabolic disease 2013. link 8 Jung G, Pabst M, Neumann L, Berger A, Lubec G. Characterization of α-l-Iduronidase (Aldurazyme®) and its complexes. Journal of proteomics 2013. link 9 Aydin M, Akarsu S, Kabakus N, Akpolat N. Mucopolysaccharidosis IIIB, cerebral vasculopathy and recurrent subdural hematoma. Indian pediatrics 2006. link 10 Cimaz R, Vijay S, Haase C, Coppa GV, Bruni S, Wraith E et al.. Attenuated type I mucopolysaccharidosis in the differential diagnosis of juvenile idiopathic arthritis: a series of 13 patients with Scheie syndrome. Clinical and experimental rheumatology 2006. link 11 Bartz HJ, Wiesner L, Wappler F. Anaesthetic management of patients with mucopolysaccharidosis IV presenting for major orthopaedic surgery. Acta anaesthesiologica Scandinavica 1999. link 12 Brooks DA, Gibson GJ, Hopwood JJ. Immunochemical characterization of feline and human N-acetylgalactosamine 4-sulfatase. Biochemical medicine and metabolic biology 1994. link 13 Nowaczyk MJ, Clarke JT, Morin JD. Glaucoma as an early complication of Hurler's disease. Archives of disease in childhood 1988. link 14 Elling H. Immunofluorescence demonstration of transdermal deposition of mucopolysaccharides into the skin. Arzneimittel-Forschung 1987. link 15 Black SH, Pelias MZ, Miller JB, Blitzer MG, Shapira E. Maroteaux-Lamy syndrome in a large consanguineous kindred: biochemical and immunological studies. American journal of medical genetics 1986. link 16 Cuhadar M, Blaauw G. Carpal tunnel syndrome in childhood. Zeitschrift fur Kinderchirurgie : organ der Deutschen, der Schweizerischen und der Osterreichischen Gesellschaft fur Kinderchirurgie = Surgery in infancy and childhood 1983. link

Mucopolysaccharidosis, MPS-II