Search PubMed⌕ Search

Biomedical subjects

C Vaysse

Publications and source records attributed to C Vaysse.

At least 19 recordsLinked to original sources
PubMed2003

Acrylate intercalation and in situ polymerization in iron-, cobalt-, or manganese-substituted nickel hydroxides.

A chimie douce route based on successive redox and exchange reactions has allowed us to prepare new hybrid organic-inorganic materials, composed of polyacrylate macromolecules intercalated into layered double hydroxides (LDHs), deriving from Ni(OH)(2). Monomer intercalation and in situ polymerization mechanisms have appeared to be strongly dependent upon the nature of the substituting cation in the slabs. In the case of iron-based LDHs, a phase containing acrylate monomeric intercalates has been isolated and identified by X-ray diffraction and infrared spectroscopy. Second, interslab free-radical polymerization of acrylate anions has been successfully initiated using potassium persulfate. In cobalt- or manganese-based LDHs, one-step polymerization has been observed, leading directly to a material containing polyacrylate intercalate.

Journal Article↗
PubMed2002

Thermal evolution of carbonate pillared layered hydroxides with (Ni, L) (L = Fe, Co) based slabs: grafting or nongrafting of carbonate anions?

The thermal evolution, from room temperature up to 300 degrees C, of layered double hydroxides (LDHs) with (Ni, Co) or (Ni, Fe) based slabs and containing intercalated carbonate anions, was studied. A new lamellar phase, exhibiting a 6.5-6.6 A interslab distance, was observed in the 200-260 degrees C temperature range. The infrared study and the chemical analysis results allowed us to give prominence to a monografting of carbonate anions to the slabs. The thermogravimetric studies seem to indicate that intercalated water is first lost, followed by a monografting of carbonate anions. A stay in water of the 200 degrees C thermally treated phase leads to a reintercalation of water molecules. The interslab distance indeed reincreases up to the value of the pristine material, reinforcing the hypothesis of the monografing.

Journal Article↗
PubMed1981

[Treatment of severe acute pancreatitis (30 cases). Respective role of surgery, intensive care and artificial nutrition (author's transl)].

The authors report on a retrospective study of 30 severe acute pancreatitis. The severity of the illness is documented by operative statement and evolution of the disease = 50 p. cent of mortality. A first group of 10 patients (1972-1975) was treated by primary intensive care and rapid ablative surgery with 10 deaths. A second group of 20 patients (1976-1980) was treated by primary intensive care, artificial nutrition and secondary surgical drainage. Mortality is significantly lower in the second group (5 deaths). It is concluded that all severe acute pancreatitis should be initially managed by intensive metabolic care and respiratory support if necessary. The only indication for primary surgery is a diagnostic doubt with peritonitis or bowell infarction. The authors emphasize the improvement of the prognosis of severe acute pancreatitis related to hemodynamic and respiratory measures and to a better nutritionnal support. Surgery should be secondary on a well prepared patient. Drainage or sequestrectomy support a lower mortality than ablative surgery.

Acute Disease↗
PubMed1979

[The venous route in total parenteral nutrition of the adult patient (author's transl)].

Total parenteral nutrition (T.P.N.) takes presently an important place in the therapeutic methods. Nevertheless multiple complications, directly related to the venous route can constitute a limiting factor in the application of such procedures. Therefore complications such as sepsis and venous thrombosis must be prevented during T.P.N. Some conditions issued from our experiences and from the results in the literature can be now well defined: 1) Surgical catheterization of the vein in cases of long term T.P.N. and transcutaneously in cases of short term T.P.N. with in all cases a long subcutaneous way of the catheter. 2) Silastic catheter must be systematically used. 3) The intravenous way of the catheter must be as short as possible. 4) Nutrients must be strictly infused in the superior vena cava. 5) The utilisation of nutritive mixtures must be prefered if possible. 6) Handling of the infusion line must be avoided. Finally the management of T.P.N. in the best conditions requires a specialized staff.

Adult↗
PubMed1976

[Difficult intubations in anesthesia].

The authors present six cases of difficult intubation and review the literature on this subject; The circumstances during which difficult intubation may be feared are recalled; some are due to the morphology of the subject, the others to his previous pathology which may be rheumatological or dermatological. The authors then discuss the method of anaesthesia for this unusual intubation and the various technical means proposed to carry out safely the intubation itself.

Anesthesia↗