RESUMO
Six cases with CT scan evidence of paramedian thalamic lacunar infarcts in the region of the paramedian thalamic arteries (4 unilateral left and 2 bilateral) are described. The main acute symptoms included disorders of consciousness, hypersomnia and sometimes vertical gaze paresis. An amnesic syndrome of variable degree and duration was observed in all cases, and in 1 of them was still present 2 years after the onset. In addition, we report a case of lateral thalamic infarction, which showed a predominantly aphasic (transcortical sensory type) clinical picture.
Assuntos
Amnésia/etiologia , Infarto Cerebral/fisiopatologia , Tálamo/irrigação sanguínea , Idoso , Infarto Cerebral/complicações , Feminino , Humanos , Masculino , Tálamo/fisiopatologia , Tomografia Computadorizada por Raios XRESUMO
We studied a large series of patients with transient global amnesia (TGA). Clinical and neuropsychological evaluations are reported. A case-control study provides some arguments against the hypothesis of cerebrovascular ischemia as a main etiology for TGA.
Assuntos
Amnésia/psicologia , Ataque Isquêmico Transitório/psicologia , Testes Neuropsicológicos , Transtornos Cerebrovasculares/psicologia , Feminino , Seguimentos , Humanos , Masculino , Rememoração Mental , Pessoa de Meia-IdadeRESUMO
Extinction to the simultaneous presentation of sounds to both ears was investigated in patients with acute cerebrovascular disease and found to be present in nearly half of the patients in the early stage of stroke. The occurrence of the symptom was not significantly different following damage to either hemisphere, but a higher percentage of right brain-damaged patients tended to show extinction for a longer time. However, this finding must be evaluated with caution since a greater number of left- than right-hemisphere patients had to be excluded from the investigation because aphasia precluded their understanding test instructions. The presence of auditory extinction was not related to that of visual extinction and there were patients with severe visual neglect who did not extinguish in the auditory modality. These findings and CT scan evidence, indicating that patients with long-lasting extinction had lesions encroaching upon the auditory pathways, suggest that in number of cases the phenomenon may have a sensory and not an attentional basis.
