RESUMEN
This case illustrates the importance of determining the precise locus and extent of a lesion when attempting to correlate lesion site with auditory brainstem response (ABR) findings. The failure to document significant ABR findings in an individual with a large mass involving the low brain stem may initially appear to constitute a threat to the sensitivity of the ABR; however, careful review of the radiologic evidence in this case suggests that sensitivity did not suffer, but rather that the specificity of the procedure was upheld. Moreover, the value of electronystagmography (ENG) in the assessment of an individual with a lesion in the region of the low brain stem and severe vestibular symptoms is demonstrated.
Asunto(s)
Neoplasias Encefálicas/diagnóstico , Potenciales Evocados Auditivos del Tronco Encefálico , Bulbo Raquídeo , Adolescente , Neoplasias Encefálicas/complicaciones , Neoplasias Encefálicas/patología , Electronistagmografía , Femenino , Cefalea/etiología , Humanos , Imagen por Resonancia Magnética , Bulbo Raquídeo/patología , Nistagmo Patológico , Vértigo/etiologíaAsunto(s)
Brotes de Enfermedades , Enfermedades Transmitidas por los Alimentos/epidemiología , Enfermedades Gastrointestinales/etiología , Intoxicación por Plantas/epidemiología , Alberta/epidemiología , Colombia Británica/epidemiología , Humanos , New York/epidemiología , Saskatchewan/epidemiologíaRESUMEN
A collaborative study was conducted in 18 laboratories to assess the performance of the hydrophobic grid membrane filter method against that of the AOAC official first action method 46.013-46.016 for enumerating total and fecal coliforms and Escherichia coli. The study was carried out on frozen breaded fish, raw comminuted poultry, unroasted walnut pieces, ground black pepper, and cheddar cheese. The hydrophobic grid membrane filter method recovered significantly larger numbers of target bacteria in 7 of the food/analysis combinations: fecal coliforms in fish; E. coli in poultry; fecal coliforms and E. coli in walnuts; and total coliforms, fecal coliforms and E. coli in black pepper. Random error (Sr2) associated with the hydrophobic grid membrane filter method was significantly lower than that of the reference method in over 30% of the paired sample series. The hydrophobic grid membrane filter method for total coliform, fecal coliform, and E. coli enumeration in foods has been adopted official first action.