[Myasthenia gravis, pregnancy and delivery: a series of ten cases]. / Myasthénie, grossesse et accouchement: à propos de dix cas.

OBJECTIVE: To study the reciprocal interferences between pregnancy and myasthenia gravis (MG) and to describe obstetric and anaesthetic management during labour and the post-partum period. STUDY DESIGN: Retrospective, single centre study. METHODS: The files of 10 patients with MG, who delivered between October 1994 and May 2002, were examined. RESULTS: No stillbirth occurred and all pregnancies were brought to term. All patients were maintained on their long-term anticholinesterase medications during pregnancy. Seven exacerbations were detected and controlled, five by increasing the anticholinesterase treatment, one by using plasmapheresis and one by using intravenous immunoglobulins. No patient required admission to the intensive care unit during pregnancy. All patients had a pre-anaesthetic visit at/near 33 weeks of gestation. Delivery was induced for six patients. Regional analgesia was performed early in labour (epidural, n = 7; combined spinal-epidural = 2) using low concentrations of local anaesthetic and no complication was detected. Three patients required a caesarean section for an obstetrical indication. Seven patients delivered vaginally using instrumental extraction (n = 5). During the post-partum period, four patients were monitored in the intensive care unit during 48 h and close neurological follow-up disclosed no exacerbation during the first 6 post-partum weeks. CONCLUSIONS: MG has no significant effect on the course of pregnancy and delivery, but MG exacerbation can occur, especially in the first trimester. Regional analgesia is medically indicated and must be performed early in labour, using low concentration of local anaesthetic to lessen the risk of motor block.

The seated man: geometry acquisition and three-dimensional reconstruction.

A three-dimensional (3D) virtual human body in seated position can be used in a wide range of applications such as basic or clinical research. A male cadaver placed in the driving position in a car cockpit was frozen. Strictly parallel 5 mm thickness serial sections were then performed. Both sides of the slices were photographed, scanned and analyzed by anatomists with software tools, in order to produce accurate contours of the identified anatomical structures. A 3D reconstruction of organs, based on the marching cubes method, was achieved except for thin structures. This allowed an anatomical validation of these reconstructed elements. The result of this work is a complete geometrical database of a seated human body in the driving position including skin, all bones, internal organs and main muscle groups.

Polarization analysis in the 3-25 keV range at the ESRF magnetic scattering beamline.

The ESRF magnetic scattering beamline has been optimized for easy tunability of the polarization and energy in the 3-40 keV range. The linear horizontal polarization from the undulator reaches 99.9%, with a flux of approximately 10(12) photons s(-1) at the sample. The diffractometer can operate in horizontal and vertical geometries, with an energy or polarization analyser. The capabilities of this beamline in terms of flux, energy tunability and polarization, permitted polarization analysis of resonant magnetic scattering from antiferromagnetic UPd(2)Si(2) at both the L(2)- and M(4)-edges of uranium, to separate the contributions of the 5f and 6d electrons to the magnetism.