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Query: UMLS:C0004134 (ataxia)
 15,886 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

To test the hypothesis that the frequency of biotinidase deficiency is greater in children with unexplained developmental delay or neurologic abnormalities than in the general population, we studied children seen at a large outpatient clinic over a four-year period who had one or more of these neurologic abnormalities and for whom no specific cause for their abnormalities could be found. The group totaled 274 children (163 boys; 111 girls) whose ages ranged from 2 weeks to 17 years. Characteristics were IQ/DQ, 30 to 70 in the 115 for whom scores were available; 41% had seizures; 15% had sensorineural hearing loss; 54% showed gross motor delay or ataxia; and 27% had decreased muscle tone. One patient with a classical clinical picture of biotinidase deficiency was diagnosed during the study period and was not included in the study. None of the patients with nonclassic findings had a deficiency of biotinidase activity. Our results suggest that biotinidase deficiency does not account for a large proportion of children with unexplained neurologic abnormalities or developmental delay. This does not negate the importance of biotinidase testing in children with clinical patterns specifically suggestive of the deficiency.
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PMID:Screening for biotinidase deficiency in children with unexplained neurologic or developmental abnormalities. 170 49

Mitochondrial disorder is an inborn error of metabolism affecting the cellular respiratory chain. Defective energy production leads to a wide variety of clinical manifestations (ataxia, epilepsy, dementia, myopathy, polyneuropathy, retinal pigment anomalies, and cardiomyopathy with conduction anomalies). Hearing loss is a regular feature and is often the first clinical symptom. Audiologic data from 26 members of a family in three generations is presented. One of these patients was examined for the biochemical error. Respiratory study of muscle biopsy revealed a mild defect in the NADH-ubiquinone oxidoreductase step of the oxidative phosphorylation (complex I). The content of cytochrome aa3 (complex IV) was also reduced. Adult onset sensorineural hearing loss starting in the high frequency region progresses with a fairly constant speed in this family. A cochlear type of hearing loss is found in the less pronounced cases. Advanced cases present features of retrocochlear affection with decreasing speech recognition, elevated acoustic reflex thresholds, and increased ABR latency with derangement of potentials. Caloric sensitivity was unaffected.
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PMID:Audiologic findings in a family with mitochondrial disorder. 180 40

We have described the important clinical features and aspects of the Chiari-I malformations, with particular emphasis on Chiari-I malformation. Previously thought to be a rare finding with only minor significance, Chiari-I malformation is an important cause of a variety of symptoms, and will be diagnosed even more frequently as the use of MRI increases. The clinician must consider Chiari-I malformation in any patient with unexplained sensorineural hearing loss, headache, vertigo, ataxia, dysequilibrium, dysphagia or other cranial nerve symptom, especially if accompanied by more classic symptoms of this disorder, such as cervical pain or weakness.
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PMID:The Chiari-I malformation. 187 53

We report on a 4-year-old girl with Angelman syndrome who has an apparent de-novo del(15) (q11q13) originating from a maternally derived chromosome. Her mother had severe brachycephaly, sensorineural hearing loss, speech impediment, and mild ataxia. CT brain scans showed an enlarged foramen magnum in the mother and daughter but magnetic resonance imaging (MRI) showed no brainstem abnormality in either. This family demonstrates that some Angelman syndrome cases may be dominantly transmitted with variable expression and associated with abnormal or cytogenetically apparently normal chromosome 15.
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PMID:Angelman syndrome in a daughter with del(15) (q11q13) associated with brachycephaly, hearing loss, enlarged foramen magnum, and ataxia in the mother. 236 43

A case of mitochondrial encephalomyopathy (Kearns-Sayre syndrome) with corneal endothelial abnormality is reported. A 22-year-old woman had retinitis pigmentosa, external ophthalmoplegia, complete heart block, ataxia, muscle weakness, dementia, sensorineural hearing loss, and was of short stature. Renal dysfunction, diabetes mellitus, and amenorrhea were also observed. Biopsy revealed decreased cytochrome c oxidase (complex IV) activity in muscle mitochondria. The corneal endothelium examined by specular microscope showed decreased cell density, severe polymegathism, and pleomorphism in both eyes. To our knowledge, this is the first report concerning primary corneal endothelial abnormality in a case with mitochondrial encephalomyopathy. The corneal endothelium is one of the tissues that could be affected by the enzyme deficiency present in this disease.
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PMID:Corneal endothelium in a case of mitochondrial encephalomyopathy (Kearns-Sayre syndrome). 274 82

Three sisters aged 16, 12 and 8 years from a consanguineous family presented with a progressive spinocerebellar ataxia combined with moderate mental retardation, progressive sensorineural hearing loss and signs of both upper and lower motor neuron disease. The patients represent the only known cases of the ataxia-deafness-retardation syndrome (McKusick #20885) except for the three brothers in the original description by Berman et al (1973). In the family described here transmission of the disease appears to be linked with occurrence of red hair colour.
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PMID:Ataxia-deafness-retardation syndrome in three sisters. 347 Jun 27

We report a case of identical twins with progressive sensorineural hearing loss, myoclonus, intention tremor, and ataxia. The involved member of the family may suggest of autosomal dominant transmission with variable penetrance.
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PMID:Familial syndrome of deafness, myoclonus, and cerebellar ataxia. 653 56

We have continued to employ transmastoid labyrinthectomy since reporting our results for the first 15 patients. Further experience has confirmed our earlier findings that the vestibular system rapidly accommodates to complete unilateral surgical vestibular ablation, regardless of age and vestibular activity of the ear operated upon as measured by bithermal caloric testing. Patients are able to ambulate in one to three days and typically return home three to eight days postoperatively. Only 7 percent of sixty patients retained occasional unsteadiness and only two individuals stated that they suffered constant unsteadiness. Once compensated, there was no instance in which vertigo or unsteadiness returned during the follow-up period. In the individual with unilateral sensorineural hearing loss and incapacitating dysequilibrium, the ear with the hearing loss can be reliably implicated as the one producing the vertigo, regardless of the vestibular activity in that ear as measured by the bithermal caloric test. As we gain more experience, this has continued to be a valid assumption. No individual has lost hearing in the contralateral ear during the period of observation. Dysequililbrium with all its variants--rotary vertigo, instability, veering , ataxia, and lightheadedness--is one of man's most disabling and incapacitating afflictions and affects an individual's ability to pursue normal life and work. We continue to be impressed with the length of time many individuals have borne this incapacitation; one-third of our patients have been incapacitated for over five years.(ABSTRACT TRUNCATED AT 250 WORDS)
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PMID:Transmastoid labyrinthectomy: surgical management of vertigo in the nonserviceable hearing ear. A five-year experience. 672 Aug 81

The clinical course of mannosidosis was studied in eight patients. The age at onset of symptoms varied from 6 months to 3 years. The first symptom was usually delayed development of speech or motor or mental functions and was often accompanied by recurrent infections. All the patients were mentally retarded, with slightly coarse facial features, poor ability to speak, sensorineural hearing loss and dysostosis multiplex. Ataxia was seen in all but one case, appearing in childhood at the same time as the hearing loss. Follow-up observations suggested gradual impairment of mental and motor functions and speech with age. Other findings were stunted growth in adults, and vacuolated lymphocytes in the peripheral blood.
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PMID:The clinical course of mannosidosis. 714 16

We report on a new maternally-inherited syndrome characterized by a combination of sensorineural hearing loss, ataxia and myoclonus in a large kindred from Sicily. Hearing loss was the most widespread and sometimes the only symptom found in family members. Sequence analysis of the mitochondrial DNA regions encompassing the tRNA genes revealed the presence of a heteroplasmic insertion at nucleotide position 7472. The insertion adds a seventh cytosine to a six-cytosine run that is part of the mitochondrial tRNASer(UCN) gene. Conformational analysis showed that this mutation is likely to alter the structure of the T psi C loop in the tRNASer(UCN) clover leaf secondary structure. Moreover, the degree of heteroplasmy in blood and muscle was correlated with the clinical phenotype, and homoplasmic mutant hybrids showed decreased complex I activity, low oxygen consumption and high lactic acid output, indicating faulty oxidative phosphorylation. Finally, mutation was absent in 381 unrelated maternal lineages, suggesting specific segregation with the disease. We propose that the C7472 insertion-mutation is pathogenic, and etiologically related to hearing loss and other symptoms that define a novel maternally-inherited clinical entity.
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PMID:Maternally inherited hearing loss, ataxia and myoclonus associated with a novel point mutation in mitochondrial tRNASer(UCN) gene. 758 83


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