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C Arenas

Publications and source records attributed to C Arenas.

22 records · Page 2Linked to original sources

Visual evoked potentials in a sample of schizophrenic patients.

Variations in evoked potentials utilizing a photic stimulus in a sample of psychiatric patients compared to a healthy sample were evaluated. A group of patients diagnosed as schizophrenic was tested against a sample of healthy volunteers in a trial combining visual evoked potentials and a simultaneous cognitive processing. The stimulus was a checkerboard pattern presented under three different conditions. The results indicate diminished P100 and lack the reactivity associated with cognitive processes in schizophrenic group. The P200 component also lacked, in the inpatient group the changes associated with the performance of the trial. Finally the multiple P300 component was shortened in latency and decreased in amplitude in the schizophrenia group. Besides, P300 interhemispheric shifts related to trials, were commonly inverted in schizophrenics. Results are interpreted as a lacked interhemispheric coordination in schizophrenics, rather than a fixed hemispheric alteration. Likewise, an attenuation in processing from specific cortical areas to association cortex is concluded.

Adult

[A fluorimetric method for the determination of brain aminopeptidases].

A fluorometric method adapted to the determination of brain aminopeptidase activities has been developed in our laboratory. This method is based in the fluorescence produced by 2-naphthylamine when it is released from aminoacyl-2-naphthylamides under the hydrolytic action of these enzymes. Values of enzymatic activities and kinetic constants are similar to those previously described in the literature.

Aminopeptidases

[Complete recovery from transient coma in bilateral paramedian thalamic infarctions].

Bilateral paramedian thalamic infarcts (BPTI) can begin clinically with transient coma, after which symptoms of fluctuating hypersomnolence, irrational behaviour, or amnesic states may be observed. We present two patients with BPTI who began with coma, recovering spontaneously in under eight hours, with no accompanying symptoms.

Aged