Correlación entre el examen mínimo del estado mental y la escala de memoria de Wechsler en una muestra de pacientes con daño cerebral / Correlation between mini mental state examination and the Wechsler memory scale in a sample of patients with sequel

Introducción. La afectación de los procesos cognitivos es muy frecuente en pacientes con daño cerebral adquirido (DCA). Una adecuada evaluación neuropsicológica permite arribar a un diagnóstico certero de la magnitud del déficit y su repercusión funcional. Este estudio examina la correlación entre un test de cribado tradicional, el Examen Mínimo del Estado Mental (MMSE) y un test específico para la evaluación de la memoria, la Escala de Memoria de David Wechsler-I (WMS-I), en una muestra de 124 pacientes con DCA. Para ello se empleó el Método de Pearson. La correlación global obtenida entre ambos test fue significativa (p≤0.05) Conclusiones. Los test de cribado constituyen una manera breve y práctica para aproximarnos al diagnóstico neuropsicológico y este estudio de correlación constata la sensibilidad y el valor predictivo del MMSE como uno de los test de rastreo más empleados en la práctica clínica para orientar la exploración de las funciones comprometidas tras la lesión cerebral. No obstante, consideramos que en modo alguno deberían sustituirse las pruebas neuropsicológicas por los test de cribado para evaluar cognición en pacientes con daño cerebral adquirido.

Introduction. The cognitive impairments are frequently in patients with acquired brain injury (ABI). The neuropsychological assessment must provide a good diagnosis of the severity and functional repercussion of the cognitive impairments. This study examines the correlation between a traditional screening test, Mini–Mental State Examination (MMSE) and a specific test for the memory evaluation, the Wechsler Memory Scale I (WMS)I, in a sample of 124 patients with sequel of ABI. The global correlation (using coefficient of Pearson) between MMSE and WMS I was statistical significant (p≤0.05). Conclusions. The screening test constitutes an easy and brief way to obtain an adequate neuropsychological diagnosis. This correlation verifies the sensibility and the predictor value of the MMSE like one of the most employees test in the clinical practice to guide the exploration by damaged functions after the brain injury. Nevertheless, we consider that neuropsychological assessment in acquired brain injury patients should not be substituted by a scrutiny instrument.

Event related potentials to the subject's own face

When subjects are able to recognize facial stimulus, ERPs display a tendency for an increased positivity in response to Familiar Faces (FF) and increased negativity in response to Unfamiliar Faces (UF). These changes seem to depend upon the experimental manipulation of the psychological variables (timing of face presentation in order to access either early or late subcomponents associated with face recognition). Characteristic of the aforementioned studies: faces presnt only two degrees of familiarity (UF vs. FF); a given face is presented for a limited number of times; previous studies used as FF famous people which the Ss only knew via the mass media. To our knowledge the faces of relatives or friends have not been used as stimuli. As an extreme case, the subject's own face is a highly familiar stimulus to each subject. ERP amplitude should reflect this effect with an enhanced positivity