Kocher–Debre–Semelaigne syndrome
Kocher–Debré–Semelaigne syndrome | |
---|---|
Other names | Debré–Semelaigne syndrome, cretinism-muscular hypertrophy, hypothyroidism-large muscle syndrome, hypothyreotic muscular hypertrophy in children, infantile myxoedema-muscular hypertrophy, myopathy-myxoedema syndrome, myxoedema-muscular hypertrophy syndrome, myxoedema-myotonic dystrophy syndrome, muscular pseudohypertrophy-hypothyroidism syndrome |
Kocher–Debré–Semelaigne syndrome (KDSS) is hypothyroidism in infancy or childhood characterised by lower extremity or generalized muscular hypertrophy (Herculean appearance[1]), myxoedema, short stature, and cognitive impairment.[2]
The syndrome is named after Emil Theodor Kocher, Robert Debré and Georges Semelaigne. Also known as Debré–Semelaigne syndrome or cretinism-muscular hypertrophy, hypothyroid myopathy, hypothyroidism-large muscle syndrome, hypothyreotic muscular hypertrophy in children, infantile myxoedema-muscular hypertrophy, myopathy-myxoedema syndrome, myxoedema-muscular hypertrophy syndrome, myxoedema-myotonic dystrophy syndrome.
The adult-onset form of this syndrome is Hoffmann syndrome.[3] Some sources claim that two of the differentiating symptoms between KDSS and Hoffmann syndrome is that Hoffmann syndrome lacks painful spasms and pseudomyotonia;[1][4] however, this claim is in conflict with other sources that list these symptoms as also being present in Hoffmann syndrome.[5][6][7][8]
Presentation
The age at which a child presents with KDSS may vary from new born to as late as 11 years of age.[9] This disease is very rare as only less than 10% of children with hypothyroid myopathy develops this condition.[citation needed] Along with features of hypothyroidism (such as lethargy, slow heart rate, cold intolerance, dry skin, and hoarse voice) the main additional feature is muscle hypertrophy. It can happen in any muscle of the limbs, but commonly affects the proximal muscles giving the typical Herculean appearance.[9]
Other features are pseudomyotonia, myokymia, slow tendon reflex, slowed muscle contractions and relaxations, muscle stiffness, proximal muscle weakness and myopathy. The severity of these symptoms are determined by the period of hypothyroidism and the degree of deficiency of thyroid hormones.[10] It may also include macroglossia.[11]
EMG is either normal or may show myopathic low amplitude and short motor unit's potential (MUAPS).[12] The enzymes creatine kinase is elevated usually.
Pathophysiology
The assumed cause of muscle hypertrophy in KDSS is an abnormal metabolism of carbohydrates leading to increased glycogen accumulation and increased mucopolysaccharide deposits in the muscles.[13] Yet another speculation is an excess intra cellular calcium due to ineffective reuptake into the sarcoplasmic reticulum, which causes a sustained contraction and thereby hypertrophy.[14]
In hypothyroidism the fast twitch muscle fiber is converted to slow twitch fiber, causing the slower reflex or hung up reflex. This may occur as a result of reduction in muscle mitochondrial oxidative capacity and beta-adrenergic receptors, as well as the induction of an insulin-resistant state, due to decrease in thyroid hormones.[15]
The causes for muscle weakness is said to be decrease in muscle carnitine, decreased muscle oxidation, expression of a slower ATPase in myosin chain and decreased transport across the cell membrane.[16][17]
The rigidity associated with congenital hypothyroidism may be due to abnormal development of basal ganglia.[18]
Diagnosis
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Differential diagnoses
Diseases known to have a pseudoathletic appearance of the calves (hypertrophy or pseudohypertrophy), including exercise intolerance and/or muscle weakness:
- Hoffmann syndrome (adult-onset hypothyroid myopathy),
- Glycogen storage disease (GSD-V, & late-onset GSD-II),[19][20]
- Non-dystrophic myotonias and pseudomyotonias (such as Myotonia congenita and Brody disease),[21]
- Limb-girdle muscular dystrophy,[22]
- Duchenne and Becker muscular dystrophy
- Focal myositis,
- Sarcoid granulomas, and
- Amyloid deposits in muscles[6]
Thyroid metabolism can be disrupted secondary to a primary disease. A common comorbidity of the metabolic myopathy McArdle disease (Glycogen storage disease type V) is hypothyroidism.[23][24] It is also a comorbidity of late-onset Pompe disease (Glycogen storage disease type II).[25][26] As both hyper- and hypothyroidism disrupts muscle glycogen metabolism, it is important to keep in mind differential diagnoses and their comorbidities when trying to determine whether signs and symptoms are either primary or secondary disease.[27][28][29][30][31]
Treatment
The muscle hypertrophy and other symptoms are reversible on treatment with levothyroxine.[32]
References
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- ^ Millichap, J. Gordon (2013). Neurological syndromes : a clinical guide to symptoms and diagnosis. New York, NY: Springer New York. p. 121. ISBN 9781461477860.
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- ^ Agrawal, Sanwar; Thakur, Prashant (2010-12-16). "Kocher–Debré–Semelaigne syndrome". BMJ Case Reports. 2010: bcr0420102877. doi:10.1136/bcr.04.2010.2877. ISSN 1757-790X. PMC 3029797. PMID 22802324.
- ^ Vasconcellos, Luiz Felipe Rocha; Peixoto, Maria Claudia; de Oliveira, Tatiana Nunes; Penque, Glória; Leite, Ana Claudia Celestino (September 2003). "Hoffman's syndrome: pseudohypertrophic myopathy as initial manifestation of hypothyroidism. Case report". Arquivos de Neuro-Psiquiatria. 61 (3B): 851–854. doi:10.1590/s0004-282x2003000500027. ISSN 0004-282X. PMID 14595495.
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- ^ Udayakumar, N.; Rameshkumar, A. C.; Srinivasan, A. V. (2005). "Hoffmann syndrome: presentation in hypothyroidism". Journal of Postgraduate Medicine. 51 (4): 332–333. ISSN 0022-3859. PMID 16388183.
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- ^ a b Tullu, Milind S.; Udgirkar, Vardhaman S.; Muranjan, Mamta N.; Sathe, Shefali A.; Kamat, Jaishree R. (2003-08-01). "Kocher-Debre-Semelaigne syndrome: Hypothyroidism with muscle pseudohypertrophy". The Indian Journal of Pediatrics. 70 (8): 671–673. doi:10.1007/BF02724260. ISSN 0973-7693. PMID 14510090. S2CID 40709054.
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