Transient mutism has been known as a rare complication following a posterior fossa approach to cerebellar tumors and its cause has not been clearly elucidated. The cerebellar mutism is not accompanied by cranial nerve deficits and disorders of consciousness. Since 1985 only 23 cases of mutism following removal of a cerebellar tumor in children have been reported in the literature. Two additional cases have been operated upon in our department. Extensive injury to the vermian and paravermian cerebellar area, involving the hemispheric cortex, cerebellar peduncles, fibers from the dentato-thalamocortical pathway, and dentate and interpositum nuclei may be the most important anatomical substrate of mutism. The mechanism of such transient mutism seems to be a complex of two or more factors (vascular disturbances due to manipulation or retraction of the cerebellar region around the IV ventricle and emotional factors). On the basis of these 25 cases the major features of the cerebellar mutism are discussed.
This chapter emphasizes some aspects of the Brazilian Guidelines for the Assessment of Head Injury Patients, written based on the experience of the Emergency Service, Neurosurgical Division of the University of São Paulo Medical School Hospital, and sponsored by the Brazilian Society of Neurosurgery. These guidelines approach the management of head-injury patients from their initial assessment in the Emergency Room until the final suggested clinical or surgical management. The Brazilian Guidelines represents our efforts to provide the basis for a common unified data collection system, which may allow cooperative studies in the future.
PALAVRAS-CHAVETraumatismo cranioencefálico.
ABSTRACT
Guidelines for prehospital and Emergency Department management of traumatic head injuries
KEYWORDSBrain injury.
The authors describe a case of an infant with congenital factor X deficiency. The patient presented with a central nervous system hemorrhage followed by hydrocephalus. He underwent a ventriculoperitoneal shunt and, during the postoperative period, developed a spontaneous epidural hematoma, which was evacuated. The clinical and pathophysiological aspects of this case are discussed based on a literature review.
In the present study, we have evaluated the use of intraventricular pressure catheters in thalamic and ganglionic hemorrhages. Ten patients admitted in our Emergency Department in Glasgow Coma Scale (GCS) equal or below 13 enrolled the study (at least one point should have been lost in the eye opening score to exclude purely aphasic patients that were fully alert). After a complete clinical and neurological evaluation, computed tomography scans were obtained and the volume of the hematomas, as well as presence or absence of hydrocephalus, were considered. Intraventricular pressure catheters connected in parallel to external derivation systems were implanted and patients were thereafter sent to the ICU. Patients that presented mass effect lesions with sustained increased ICP levels or clinical and neurological deterioration were submitted in addition, to the surgical evacuation of the hematomas. Clinical evolution, complications and the rehabilitation of the patients were recorded. Clinical outcome was assessed with the Glasgow Outcome Score. In all but three patients the initial intracranial pressure levels were bellow 20 mmHg (mean for all patients was 14.1 +/- 6.5 mmHg). Notwithstanding, these three patients were extremely difficult to treat. For this group of patients mortality was 100%. Among the patients that presented ICP levels bellow 20 mmHg, 04 developed hydrocephalus and 03 did not display ventricular dilation. As expected, the major benefits concerning the intraventricular pressure catheters connected in parallel with external derivation systems were observed in the group of patients that presented ICP levels bellow 20 mmHg and had hydrocephalus. Mild non-statistically significant correlations for all the three groups were achieved either when the initial GCS and ICP levels (r=-0.28, p=0.43) or when ICP levels and the volumes of the hematomas were compared (r=0.38, p=0.28). In addition, no significant correlations were observed concerning the final outcome of the patients and the variables previously evaluated.
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