Biomedical subjects

A G Machado

Publications and source records attributed to A G Machado.

4 recordsLinked to original sources

PubMed2001

Guidelines for neurosurgical trauma in Brazil.

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.

Brain Injuries↗

PubMed2001

Functional recovery after combined cerebral and cerebellar hemispherectomy in the rat.

The cerebellum seems to be one of the structures responsible for early neurological improvement after cerebral hemispherectomy and its consequent deficits. Considered as an accessory brain, the cerebellum may constitute a neurobiological substrate for the recovery of such extensive cortical and subcortical lesions. It may compensate for the injury by structural remodeling and plasticity. The authors observed that, indeed, rats submitted to contralateral hemicerebellectomy before cerebral hemispherectomy do not recover as well as those submitted to hemicerebellectomy 2 weeks after cerebral hemispherectomy.

Age Factors↗

PubMed1999

Intravascular papillary endothelial hyperplasia causing cauda equina compression: case report.

OBJECTIVE AND IMPORTANCE: Intravascular papillary endothelial hyperplasia (Masson's vegetant hemangioendothelioma) is a rare condition affecting the neuraxis. In the literature, only one case of this lesion involving the vertebral canal with spinal cord compression has been reported. We present a case of cauda equina compression due to this abnormality. CLINICAL PRESENTATION: A 17-year-old boy was admitted at our hospital with pain, numbness, paresis of the left lower extremity, and bladder dysfunction of approximately 1 month's duration. Computed tomography and magnetic resonance imaging of the spine revealed a tumor within the spinal canal at the T12-L1 level. INTERVENTION: The patient underwent a T12-L1 laminectomy. An epidural red nodular tumor was visualized and totally resected. The findings of the pathological examination were compatible with intravascular papillary endothelial hyperplasia. At follow-up examination 1 month after the operation, the patient had complete resolution of the pain, and the motor deficit and bladder dysfunction had improved significantly. CONCLUSION: This rare benign vascular lesion may be clinically and histopathologically mistaken for an angiosarcoma. Because the intravascular papillary endothelial hyperplasia can be cured by complete surgical resection, it is important to distinguish between these two lesions to avoid inappropriate aggressive treatment.

Adolescent↗

PubMed1997

Evaluation of the effectiveness of sodium hypochlorite used with three irrigation methods in the elimination of Enterococcus faecalis from the root canal, in vitro.

The effectiveness of 4.0% sodium hypochlorite (NaOCl) used with three irrigation methods in the elimination of Enterococcus faecalis from the root canal was tested in vitro. Root canals contaminated with E. faecalis were treated as follows: (i) irrigation with 2 mL of NaOCl solution and agitation with hand files; (ii) irrigation with 2 mL of NaOCl solution and ultrasonic agitation; (iii) irrigation with NaOCl alternated with hydrogen peroxide. Contaminated canals irrigated with sterile saline solution served as the control. Paper points used to sample bacteria from the root canals were transferred to tubes containing 5 mL of brain heart infusion (BHI) broth. Tubes were incubated and the appearance of broth turbidity was indicative of bacteria remaining in the root canal. There were no statistically significant differences between the experimental groups. However, NaOCl applied by the three methods tested, was significantly more effective than the saline solution (control group) in disinfecting the root canal.

Chi-Square Distribution↗