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Biomedical subjects

S Blond

Publications and source records attributed to S Blond.

98 records · Page 6Linked to original sources
PubMedDate not supplied

[Correlations between intracranial pressure variations and EEG changes in patients with cranial trauma (author's transl)].

Polygraphic studies were performed over periods of 14 to 76 hours in 30 patients with reccent closed cranial injuries. Correlations between ICP and EEG findings were rarely found (3/16) in cases of cerebral dysfunction of mesodiencephalic or lower levels, where both ICP and EEG were usually stable. Correlations are regularly found in diencephalic or higher (10/14) levels and their presence is of favourable prognostic significance. Generally, delta waves at 1,5-2 cs, high in amplitude (type A) accompany reduced or low ICP levels,while a rapid and low voltage tracing (type B) is associated with raised or high levels of ICP. In the latter cases, a very slow (0.5 cs) and low in amplitude tracing (type C) can progressively replace the type B. The classical periodic or alternating tracing associates alternate sequences of type A and B and is observed simultaneously with type B pressure waves. These correlations are analogous with those observed during the evolution of intracranial tumors or hydrocephalus. The EEG modifications are probably related more to the pathological lesion than to a direct action of fluctuations in ICP.

Adolescent↗
PubMedDate not supplied

Validation of a new method for stereotactic localization using MR imaging.

Magnetic resonance is recognized as potentially the best imaging procedure for localization in stereotactic neurosurgery. However, special difficulties necessitate specific adaptation to localize targets in the stereotactic frame. We developed a new method for stereotactic localization. The MR studies were performed using a 0.5 T imager. Four small boxes filled with CuSO4 solution were inserted into the intracranial holders of a Talairach frame. Using fast sequences, thirty 7-mm thick contiguous sagittal slices and twenty 5-mm thick axial slices enabled us to image the entire brain. The image data were transferred for analysis to an image processing station, including special software to handle stereotactic calculations. The accuracy of the origin of the trihedron and systematic geometrical errors were carefully evaluated using a cubic phantom, and corrective algorithms were applied when needed. Moreover, checks have been designed to detect geometrical distortion due to ferromagnetic artifacts, alterations in gradient calibration, or movements made by the patient. This localization method does not necessitate the use of stereotactic frames and appears to be precise enough for clinical use. Duration of MR examination is not a restricting factor, mainly because the patient can be positioned easily.

Calibration↗
PubMedDate not supplied

[Stereotaxic technics in expanding lesions of the brain stem].

Stereotactic biopsies, according to the Talairach's system, define the histopathological data (nature, grading, spatial delimitation, evolutive potential) of brain stem lesions, precisely localized by computerized tomography scanner and magnetic resonance imaging. They are the more valued complement of the modern neuro-imaging and they prove the extreme polymorphism of theses lesions. According to this histological analysis and the volume of the lesions, it's possible to choose the best therapeutic procedure.

Adult↗
PubMedDate not supplied

[Femoral neuropathy with deafferentation pain. Complications of a hematoma during anticoagulant treatment].

A case of femoral palsy associated with chronic pain sensible to Carbamazepine, secondary to iliacus haematoma during anticoagulant therapy is reported. Late femoral nerve decompression followed by transcutaneous neurostimulation permit the normalization of the sensory nerve conduction and a complete clinical recovery. The localizations of hemorrhage and nervous compression are discussed. The necessity of a nerve decompression when features of nervous conduction persist is emphasized. Clinical symptomatology, Carbamazepine and transcutaneous neurostimulation efficacity, electrophysiological features are correlated with a central deafferentation state caused by an incomplete and heterogeneous lesion of the sensory nerve conduction pathways.

Carbamazepine↗