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Query: UMLS:C0026850 (muscular dystrophy)
 5,870 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

A new type of progressive muscular dystrophy, autosomal recessive distal muscular dystrophy, is described, based on observations on 17 cases (8 males and 9 females) in 8 families, including an autopsied case. The disease developed in young adults. Muscle weakness and atrophy were most marked in the distal parts of the legs, especially in the gastrocnemius and soleus muscles, and then spread to the thighs and gluteal muscles. Early impairment of standing on tip-toe with retention of the ability to stand on the heels was conspicuous. Difficulty in climbing stairs, standing up and walking subsequently appeared, but rarely progressed to confinement to bed. The forearms became mildly atrophic, with decrease in grip strength, but the small hand muscles were spared. The EMG showed myopathic changes and nerve conduction was normal. Serum creatine kinase activity was characteristically increased up to 100-fold in the early stages of the disease. It was also markedly increased in subjects in the preclinical stage and mildly in some heterozygotes. Muscle biopsies revealed myopathic changes with severe segmental necrosis accompanied by regeneration. The changes were similar to those of Duchenne muscular dystrophy. An autopsied case, aged 68 years, showed generalized muscle abnormalities with a distal predominance. The muscles in the lower legs, especially those of the calves, were severely affected. No lesions were found in the brain, spinal cord or peripheral nerves.
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PMID:Autosomal recessive distal muscular dystrophy as a new type of progressive muscular dystrophy. Seventeen cases in eight families including an autopsied case. 394 56

One hundred thirty-one patients who were referred for muscle biopsy for in vitro contracture testing (IVCT) for susceptibility to malignant hyperthermia (MH) were studied. Serum creatine kinase (CK) levels were determined routinely before biopsy by the hospital clinical laboratories. Thirty-four had abnormal IVCTs (indicating susceptibility to MH) and 87 patients had normal IVCTs; all these 121 patients had normal CK levels. Ten additional patients had other muscle disorders (central core disease, hyperkalemic periodic paralysis, and Duchenne's muscular dystrophy) and abnormal IVCTs; six of the ten had elevated CK levels. We conclude that the serum CK level, as determined routinely, does not identify MH-susceptible individuals, but may indicate the presence of muscle disease. Therefore, the use of serum CK level as a screening or diagnostic test for susceptibility to MH should be abandoned.
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PMID:Serum creatine kinase level as a screening test for susceptibility to malignant hyperthermia. 394 79

A kindred with dominantly inherited ataxia demonstrated hypertrophia musculorum vera as a phenotypic feature of the disease. The proband had fasciculations, cramps, absent sensory nerve action potentials, an increased creatine kinase level, dramatic enlargement of calf muscles, and a muscle biopsy specimen showing denervation accompanied by true muscle fiber hypertrophy; ataxia and other clinical signs of spinocerebellar degeneration were also present. Other family members displayed progressive ataxia and calf muscle enlargement to varying degrees. Though peroneal atrophy is a more common feature of the familial ataxias, some kindreds may have muscle enlargement simulating the pseudohypertrophy of muscular dystrophy that is due instead to denervation-induced compensatory individual fiber hypertrophy.
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PMID:Hypertrophia musculorum vera in familial ataxia. 394 54

A number of workers have reported that avian muscular dystrophy causes alterations in the levels of certain enzyme activities in "fast-twitch" muscle fibers but has little effect on enzyme activities in "slow-twitch" muscle fibers. In the present work, the effects of this disease on the content and relative rates of synthesis of a number of glycolytic enzymes and the skeletal muscle-specific MM isoenzyme of creatine kinase in chicken muscles was investigated. It was shown that (i) the approximate 50% reductions in steady-state concentrations of three glycolytic enzymes (aldolase, enolase, and glyceraldehyde-3-P dehydrogenase) in dystrophic breast (fast-twitch) muscle result predominantly from decreases in relative rates of synthesis, rather than accelerations in relative rates of degradation, of these proteins in the diseased tissue; (ii) in contrast to the situation with the glycolytic enzymes, muscular dystrophy has only minor effects (25% or less) on the content and relative rate of synthesis of MM creatine kinase in breast muscle fibers; (iii) the muscular dystrophy-associated alterations in content and synthesis of the glycolytic enzymes in breast muscle fibers become apparent only during postembryonic maturation of this tissue; and (iv) as expected, muscular dystrophy has no significant effect on the content or relative rates of synthesis of glycolytic enzymes in slow-twitch lateral adductor muscles of the chicken. These results are discussed in terms of the apparent similarities between the effects of muscular dystrophy and surgical denervation on the protein synthetic programs expressed by mature fast-twitch muscle fibers.
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PMID:Content and synthesis of glycolytic enzymes and creatine kinase in skeletal muscles and normal and dystrophic chickens. 397 May 44

A mature female Rhodesian Ridgeback was determined to have a progressive, degenerative myopathy associated with myotonia, dysphagia, and marked muscle wasting. Clinical findings revealed a diffuse muscular disease with percussion dimpling, dysphagia, and creatine kinase elevation. A paroxysmal atrial tachycardia was found. Electromyography revealed a diffuse myopathy with high-frequency bizarre waves, myotonic discharges especially in the masticatory, laryngeal, and pharyngeal muscles. A few positive sharp waves were found in some of the appendicular muscles. Histopathologic and histochemical stains on skeletal muscle biopsy specimens demonstrated moderate fiber-size variation, myofiber architectural changes, muscle-fiber splitting, focal necrosis and phagocytosis, high percentage of internal nuclei, and atrophy of type-2 muscle fibers. A review of myotonic myopathies in the dog is presented. The clinical, electrophysiologic, and histochemical findings are similar to those for myotonic muscular dystrophy in man.
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PMID:Myotonic dystrophy-like disease in a dog. 397 11

Two cases of quadriceps amyotrophy, probably of chronic neurogenic origin are reported. Only the knee jerks were diminished, the calves hypertrophic, and the serum creatine kinase level very high in one case, and there were neurogenic electromyographic abnormalities in the quadriceps. In the first case, biopsy of the quadriceps muscle revealed a neurogenic origin with hyalinized hypertrophic fibres. CT scan showed abnormalities not only in the quadriceps but also in the sartorius, gracilis and gastrocnemius muscles. A second biopsy specimen from the gastrocnemius muscle showed histological findings similar to those of the quadriceps. In the second case, the EMG and biopsy findings suggested a myogenic origin, but 6 years later they were compatible with neurogenic atrophy. Differentiation from Becker dystrophy is very difficult in the first case and the second case is more a focal spinal amyotrophy. Further, in spite of their localization, the extension of the affected muscles changes the diagnosis. The same applies to chronic quadriceps amyotrophy in general, which cannot be regarded as an entity, but which suggests muscular dystrophy, spinal atrophy, polymyositis or a metabolic disorder. These cases can be compared with the four cases reported in the literature, which were regarded as a "forme fruste" of chronic spinal amyotrophy.
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PMID:Chronic neurogenic quadriceps amyotrophies. 403 57

The sera from patients with human Duchenne (X-linked) progressive muscular dystrophy contain elevated adenylate kinase (ATP: AMP phosphotransferase, EC 2.7.4.3) activities, in addition to their characteristically high creatine kinase (ATP; creatine N-phosphotransferase, EC 2.7.3.2) activities. By agarose gel electrophoresis of human Duchenne dystrophic serum, the presence of an apparently normal human serum adenylate kinase together with a variant species of adenylate kinase was detected. The latter enzyme species appeared, in its mobility, to be similar to that of the normal human liver-type adenylate kinase. The presence of this aberrant liver-type adenylate kinase could also be demonstrated by characteristic (for the liver type) inhibition patterns with P1,P5-di-(adenosine-5')pentaphosphate, 5,5'-dithiobis(2-nitrobenzoate) and phosphoenolpyruvate. On the other hand, by inhibition titrations with an anti-muscle-type adenylate kinase, hemolysates from the erythrocytes of several Duchenne and Becker's dystrophics were found to contain approx. 96% muscle-type adenylate kinase and their serum approx. 97% muscle-type adenylate kinase. These same patients contained approx. 89% M-M type creatine kinase in their serum (by inhibition against anti-human muscle-type creatine kinase) indicative of the presence also of M-B plus B-B type active isoenzymes. All of these data can best be explained by the presence of a variant or mutant adenylate kinase isoenzyme in the dystrophic serum. This isoenzyme appears to resemble the liver type in its inhibition patterns with P1,P5-di(adenosine-5')pentaphosphate, 5,5'-dithiobis(2-nitrobenzoate) and phosphoenolpyruvate, and in its heat stability (compare also the agarose gel electrophoresis pattern); but structurally, it is a muscle type, or derived from a muscle type, as shown immunologically by inhibition reactions with anti-muscle-type adenylate kinase. Whether this is a fetal-type isoenzyme of adenylate kinase will require further investigation.
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PMID:An aberrant adenylate kinase isoenzyme from the serum of patients with Duchenne muscular dystrophy. 626 33

Two sisters presented with distal weakness and their muscle biopsy was dystrophic. This distal muscular dystrophy has an autosomal recessive inheritance and its features are somewhat different from the more common autosomal dominant distal muscular dystrophy and include: a) onset in early adult life; b) involvement of distal leg muscles and especially peroneal muscles; c) marked early elevation of serum creatine kinase (CK); d) brief duration, small amplitude motor units and fibrillation on electromyography; and e) histologic features of a dystrophic myopathy.
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PMID:Distal muscular dystrophy with autosomal recessive inheritance. 654

Duchenne muscular dystrophy is a severe inherited disease. The pathogenesis is unknown. Duchenne dystrophy is characterized by a large number of membrane abnormalities, which are manifested by a leakage of muscle enzymes, such as creatine kinase (CK), and a reduction in cap formation in lymphocytes. In the present study serum CK and percentage lymphocyte capping in 8 patients with progressive muscular dystrophy, 6 with different myopathies and normal controls are investigated. Reduced antibody-induced redistribution of membrane antigens of B and T lymphocytes and high serum CK activity is found in boys with Duchenne dystrophy if compared with normal subjects and no correlation exists between the two parameters. Our data indicate that the determination of fetal serum CK activity associated with fetal lymphocyte capping may have diagnostic value in antenatal detection of Duchenne dystrophy.
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PMID:[Possibility of prenatal diagnosis of progressive muscular dystrophy: evaluation of creatine kinase activity in serum and the capping of lymphocytes]. 660 63

The authors reported a large study of 93 children presenting a severe form of progressive muscular dystrophy. The first clinical symptoms were noticed between 3 to 12 years. The atrophy affects, predominantly, the girdle and truncal muscles. The hypertrophy of the calves is almost consistent. The progression of the disease is severe, often like that the Duchenne type. In most of the cases, inability to walk occurs between 10 and 20 years. The serum creatine kinase activity is markedly high in the first stages of the disease. There is a necrotic regenerative pattern at muscle biopsy, associated with a marked type 1 predominance. The disease appears to be inherited as an autosomal recessive trait, with equal distribution among the two sexes. There is a marked variability in the intensity of symptoms and in the severity of the course of the disease from one sibling to another, and from one family to another. This disease is frequent in Tunisia and seems to be related to the high degree of consanguinity in this country.
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PMID:Severe childhood muscular dystrophy affecting both sexes and frequent in Tunisia. 663 60


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