22 abr. 2012

Study of patients whit Postpolioylitis in Neuromuscular Symptmos


Abstract
A "post-polio" syndrome characterized by new neuromuscular symptoms, including muscle weakness, may develop years after recovery from acute paralytic poliomyelitis. We studied 27 patients (mean age, 50.6 years) in whom new muscle weakness developed a mean of 28.8 years after recovery from acute polio. We reevaluated these patients during a mean follow-up period of 8.2 years (range, 4.5 to 20) after they were originally studied at the National Institutes of Health. The total mean follow-up period after the onset of new weakness was 12.2 years (range, 6 to 29). The patients were assessed with quantitative muscle testing, muscle biopsy, electromyography, and virologic and immunologic examination of the cerebrospinal fluid.
Muscle strength had declined in all patients. The rate of decline averaged 1 percent per year. The decrease was irregular, with subjective plateau periods that ranged from 1 to 10 years. None of the patients had amyotrophic lateral sclerosis. Oligoclonal bands (IgG) were found in the cerebrospinal fluid of 7 of 13 patients studied, but no specific elevation of antibodies to poliovirus was observed in the cerebrospinal fluid. The newly affected muscles that were evaluated longitudinally with follow-up muscle biopsies and electromyography showed signs of chronic and new denervation. Groups of atrophic muscle fibers (group atrophy) and "neurogenic jitter" were not present.
New post-polio muscle weakness is not a life-threatening form of motor-neuron deterioration. It appears that this weakness is not due to a loss of whole motor neurons, as in amyotrophic lateral sclerosis, but that it is due to a dysfunction of the surviving motor neurons that causes a slow disintegration of the terminals of individual nerve axons. (N Engl J Med 1986; 314:959–63.)

SOURCE INFORMATION

From the National Institute of Neurological and Communicative Disorders and Stroke, National Institutes of Health, Bethesda, Md. Address reprint requests to Dr. Dalakas at Bldg. 36, Rm. 5D06, NIH, NINCDS, Bethesda, MD 20892.

MEDIA IN THIS ARTICLE

FIGURE 1Progression of Muscle Weakness in 12 Patients with Post-Poliomyelitis Muscular Atrophy, Expressed as Total Points of Estimated Neuromuscular Function at Various Years of Age.
FIGURE 2Transverse Frozen Section of a Muscle Biopsy Specimen from Patient No. 2.

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Enlaces

México Post Polio Una Vida Un Camino Una Experiencia
http://postpoliosinmex.blogspot.com/

Post Polio LITAFF A.C.

www.postpoliolitaff.org/
Postpoliolitaff.- Asociación Post Polio Litaff A.C Primera Organización oficial sobre Síndrome de Post Poliomielitis En México.


Polio y Efectos Secundarios SPP
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