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Biomedical subjects

J Guery

Publications and source records attributed to J Guery.

16 recordsLinked to original sources
PubMed2006

Irreversible shear-activated aggregation in non-Brownian suspensions.

We have studied the effect of shear on the stability of suspensions made of non-Brownian solid particles. We demonstrate the existence of an irreversible transition where the solid particles aggregate at remarkably low volume fractions (phi approximately 0.1). This shear-induced aggregation is dramatic and exhibits a very sudden change in the viscosity, which increases sharply after a shear-dependent induction time. We show that this induction time is related exponentially to the shear rate, reflecting the importance of the hydrodynamic forces in reducing the repulsive energy barrier that prevents the particles from aggregating.

Journal Article↗
PubMed1977

[Ventilatory disorders in the acute period of tetraplegia of traumatic origin].

Out of a total of 30 cases of traumatic tetraplegia with the lesion situated from C1 to C8 seen during the acute phase in the department of Professor JUDET, 8 posed no respiratory problems, whilst the others suffered lobar or pulmonary atelectasis in 13 cases, retention of bronchial secretions with secondary infection in 6 cases and progressive hypoxaemia in 3 cases. The first two types of complication are mechanical in origin and are directly related to the neurological problem. The third type is of more complex pathogenesis, combining water retention, hypoproetinaemia and secondary infection.

Adolescent↗
PubMed1975

[Value of moderate fentanyl dosage during anesthesis in abdominal surgery. Apropos of 100 cases].

Fentanyl was used in 100 abdominal surgical interventions, combined with droperidol or with diazepan, always with good results as far as analgesia was concerned. Tensional variations that occurred during the induction were quite small and disappeared during the filling up. In the course of the intervention, tensional variations were only met with subjects suffering from high blood pressure. The respiratory depression that went with analgesia did not constitute an obstacle but made it necessary to use artificial ventilation for the intervetion. The awakening was always quick, smooth, without any vomiting and was influenced neither by the time taken up by the intervention nor by the condition of the patient. No residual respiratory depression requiring the use of an anti-morphinic was noted. At the end of the study, fentanyl appears as a powerful analgesic, easy to use and successful in all the cases of abdominal surgery. Its effect does not last, a drawback that can be avoided by the use of an intravenous drip.

Abdomen↗
PubMedDate not supplied

[Anesthesia and resuscitation in surgery for aseptic osteonecrosis in patients with renal transplants].

Aseptic osteonecrosis following renal transplantation occurs in about 20 p. 100 of cases and entails important functional consequences. 16 patients with kidney transplant and 4 patients on chronic dialysis because of previous graft rejection underwent 27 orthopaedic operations, 8 of which being hip arthroplasties. During and after the procedure the anesthesiologist had to manage with drug interaction, coagulation disorders, blood compatibility problems etc... Despite poor general condition of patients and the risk of infectious complications linked to the never interrupted immunosupressive treatment, the surgical results of our serial were good.

Adolescent↗
PubMedDate not supplied

[Accidental peroperative hypothermia during rapid transfusion].

Six cases of grave hypothermias are reported, having arisen during surgical interventions which necessitated a rapid and abundant transfusion of badly warmed blood. The role of favouring factors, surrounding cold due to the air-conditioning, anaesthesia, extent of the area of operation, seems important. The symptomatology permits the individualization of a hypothermic syndrom neighbouring the picture described in toxic accidental hypothermias. Accidents during the warming process associate collapse and disturbances in coagulation. It is therefore necessary to consider certain signs of alarm as important and generalize the conditions for prevention of thermolysis in the operating theatre.

Acid-Base Equilibrium↗