Biomedical subjects

L Bidaut

Publications and source records attributed to L Bidaut.

7 recordsLinked to original sources

PubMed1998

Ictal agraphia: a patient study.

We present a case of "pure" or "apraxic" agraphia, a recognized writing disturbance, caused by intermittent focal seizures from the left posterior parasagittal parieto-occipital region. Pure agraphia has been described in focal lesions or as part of a generalized confusional syndrome. The posterior cerebral vascular territory is the characteristic site for the transient neurologic syndromes associated with cyclosporine toxicity. Our patient was at risk for this complication while recovering from a lung transplant, with elevated cyclosporine levels.

Agraphia↗

PubMed1998

Biomechanical analysis and clinical treatment of blunt renal trauma.

The treatment of renal trauma is evolving and increasingly focusing on the nonoperative and expectant management. In this review the ongoing controversy concerning the diagnosis and management of major blunt renal trauma shall be revisited. The contribution also includes a biomechanical approach for analyzing the renal injury mechanisms using a computer-simulated model of the kidney. In this connection, results of the modelling and simulations of the kidney subjected to the external forces shall be presented. Based on these findings a bending mechanism is postulated that may be responsible for renal injuries. Finally, the role of injury biomechanics research in the clinical management of trauma patients as well as in the area of injury prevention is discussed.

Abdominal Injuries↗

PubMed1996

Relationship between intrahepatic vessels and computer-generated hepatic scissurae: an in vitro assay.

Liver segmentation is a matter of increasing importance for radiologists, in particular with respect to accurate preoperative localisation of focal hepatic lesions. Procedures for delineating the segmental anatomy from CT or MR images are therefore much in demand. In this context, a convenient technique for generating the intersegmental scissurae by computer has recently been proposed [9]. The procedure, however, seemed questionable from an anatomical point of view. We therefore checked its relevance using anatomical vascular casts of post mortem livers and comparing the computer-generated scissurae with the actual course of the intrahepatic vessels. The results presented in this paper confirm that a rigid application of flat scissural planes is not able to render the real intrahepatic compartmentation. Only techniques considering the effective individual vascular anatomy can provide a correct determination of the hepatic segments.

Aged↗

PubMed1994

Brain oedema induced by ventricular puncture. A study by magnetic resonance on a series of forty-one normal-pressure hydrocephalic patients.

After ventricular catheterization magnetic resonance (MR) imaging very often demonstrates a focal area of high signal along the drain track which corresponds to parenchymal oedema. This high signal seemed to be more pronounced when the frontal area was catheterized than when the junctional parieto-temporo-occipital parenchyma (or trigonal area) was catheterized. In order to confirm this impression, we prospectively studied 41 consecutive patients with normal-pressure hydrocephalus in whom both of these brain regions were catheterized for intracranial pressure monitoring. Each patient was evaluated by serial MR. The extent of the MR hypersignal induced by both catheterizations was computed from digitized MR masks. The extent of the MR high signal area was significantly greater when the frontal area was catheterized compared to the trigonal area suggesting that the frontal area could be more prone to injury.

Adult↗

PubMed1994

Temporal glucose metabolism in borderline personality disorder.

The pathophysiology of borderline personality disorder (BPD) is obscure. Underlying organic factors such as epilepsy are suspected because clinical characteristics of the syndrome are similar to some manifestations of patients with complex partial seizures (CPS). Positron emission tomography (PET) with 18F-fluorodeoxyglucose (FDG) reveals hypometabolism in the area surrounding epileptic foci. To test the epilepsy hypothesis in BPD, we have explored 10 patients with BPD and compared them with 15 control subjects using PET with FDG. We conclude that PET provides no metabolic indication of temporal lobe epilepsy in BPD.

Adult↗

PubMed1992

Morphological quantitative analysis of intracranial pressure waves in normal pressure hydrocephalus.

This work presents a prospective morphological and quantitative analysis of 43 intracranial pressure recordings performed on normal pressure hydrocephalic patients. This analysis led us to separate Lundberg's B waves into different subtypes and to refine the definition of the 'Plateau' wave. Two B wave subtypes named Great Symmetrical wave and Intermediate wave appeared correlated with the surgical improvement. In addition, the degree of post-operative improvement was correlated with the frequency of Intermediate wave. An extended quantitative classification of intracranial pressure waves is proposed that can be used alone to determine which patients should undergo a shunting procedure and which one should the most improve.

Aged↗

PubMedDate not supplied

Data and image processing for abdominal imaging.

Modern imaging techniques allow information from within the human body to be obtained by using noninvasive or minimally invasive means. This article is intended as a summary of the tools used for processing and displaying such datasets, with a focus on abdominal imaging. Although these tools and their applications are permanently evolving, their use for clinic and research is already recognized as essential. As an insight into the near future, advanced protocols such as multidimensional and multimodality diagnostic and therapy planning are also demonstrated with a few clinical examples.

Abdomen↗