RESUMEN
Quantitative electromyographic (QEMG) data from 3 muscles recorded with a 50-micronV threshold for the turns and amplitude measurements are presented. Using turns per unit amplitude as the index, consistent and comparable readings were recorded from abductor digiti minimi, biceps brachii and vastus medialis in normal subjects, namely 1.132 +/- 0.08 (31 subjects), 1.059 +/- 0.122 (31 subjects) and 1.007 +/- 0.088 (11 subjects), respectively. It is shown here that the diagnostic yield increases when all 3 values, namely, turns/s, average amplitude and turns/unit amplitude are considered in conjunction rather than considering the first 2 alone.
Asunto(s)
Electromiografía/métodos , Procesamiento Automatizado de Datos/métodos , Enfermedades Neuromusculares/diagnóstico , Adulto , Femenino , Humanos , Lepra/complicaciones , Masculino , Persona de Mediana Edad , Contracción Muscular , Distrofias Musculares/diagnóstico , Enfermedades del Sistema Nervioso Periférico/diagnóstico , Nervio Cubital/fisiopatologíaRESUMEN
Quantitative electromyographic (QEMG) data recorded with two levels of threshold for the apparatus are compared. Using a fixed fraction of a subject's maximum effort the data are shown to be independent of sex, age and the strength of the muscles. The diagnostic yield of such a method is shown to be better with 50 muV threshold for analysis than with 100 muV, in cases of muscle disorders such as Duchenne muscular dystrophy and polymyositis. However, in cases of neurogenic lesions due to anterior horn cell disease the diagnostic yield remains the same with both thresholds.
