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Biomedical subjects

A Gédéon

Publications and source records attributed to A Gédéon.

At least 19 recordsLinked to original sources
PubMed1995

Application of 129Xe nuclear magnetic resonance to the study of Cu-Y zeolites: dehydration and redox effects.

Copper-exchanged sodium Y zeolites have been studied by using 129Xe nuclear magnetic resonance (NMR) spectroscopy. The oxidation state as well as the location of copper in the zeolite have been determined for different samples at various levels of exchange (lambda = 15, 35, 58%) and hydration, and at different stages of redox treatment. Information about the nature of Xe-Cu+ or Xe-Cu2+ interactions has been obtained by a combination of electron spin resonance (ESR) and 129Xe NMR measurements on Cu-Y and Cu-Rho zeolites.

Copper↗
PubMed1990

[Mesenterico-atrial shunt in Budd-Chiari syndrome with inferior vena cava thrombosis. Report of 2 cases].

Two new cases of Budd-Chiari syndrome associated with thrombosis of the inferior vena cava are reported. The predominant clinical sign was ascites, and the diagnosis was suggested by ultrasound and confirmed by angiography and the imaging techniques. In one case, the etiological assessment revealed an association with an oral contraceptive treatment; the etiological research remained negative in the other case. A mesenterico-atrial shunt was performed in both patients, and its patency was controlled with magnetic resonance imaging: both shunts are functional after 38 and 45 months respectively. On the basis of these two cases, the diagnostic process, the surgical indications and the choice of the techniques are discussed. The mesenterico-atrial shunt described by Cameron and Maddrey in 1978 seems to be an interesting and reliable therapeutic choice for the Budd-Chiari syndrome with thrombosis of the inferior vena cava.

Adult↗
PubMed1985

[180 aorto-bifemoral bypasses for chronic occlusive arteritis].

In the authors' experience, 180 aorto-bifemoral by-pass grafts represent 42.4% of all reconstructive operations for aorto-iliac atheromatous disease performed between 1st January 1972 and 1st July 1983. 37% of the patients presented a threatened amputation and 38.8% had a walking distance of less than 100 metres. The immediate post-operative mortality (1st month) was 2.2% (4 patients). The 5 year survival, expressed according to the actuarial method, was 89% and the patency was 91%. The long-term functional deterioration was due to a progressive alteration of the distal vascular bed and to complications: false aneurysms (2.2%), prosthetic infections (1%), aorto-intestinal fistulae (2.2%), thrombosed prostheses (7.3%). 7 complementary femoro-popliteal by-pass grafts (4%) and 13 major amputations (7.4%) were required. The authors stress the value of performing end-to-end aortic anastomoses rather than side-to-end anastomoses. The anastomoses should be well isolated from the gastrointestinal tract. The patients should be rigorously followed post-operatively and any complication detected should be treated actively.

Aged↗
PubMed1984

[Symposium on aneurysmal disease. General remarks].

After defining the limits of the subject to be discussed, the principal generalities are mentioned, based on reports of studies in the literature and the replies supplied by 22 teams to a survey conducted at the time of this report. Localizations of the aneurysms, the age and sex of patients, and the physiopathology and pathogenesis, still incompletely understood, are then outlined.

Adult↗
PubMed1984

[Aneurysmal diseases. Clinical aspects].

Various features related to anatomoclinical findings are discussed, including extension of aortic aneurysms to the iliac arteries, the different iliac artery localizations, bilateral and multiple lesions. The general course and natural history of aneurysmal disease are then described, together with essential diagnostic and investigational features.

Aneurysm↗
PubMed1982

[Outcome of patients undergoing surgical plication of the inferior vena cava].

In a group of 70 patients, 40 undergoing the insertion of a Mobin-Uddin umbrella and 30 the placing of an Adams-DeWeese clip, the authors noted a 6% recurrent embolism rate within a follow up period of 14 months to 5 years. This was fatal in 1.5% of cases. There was 10.9% recurrent phlebitis and 9.4% sequelae of severe stasis. Mobin-Uddin umbrellas gave the most complications and should be reserved for the worst cases. Indications for the Adams-DeWeese clip can be extended to surgical patients with a thrombo-embolic risk and to dangerous clots visualised by phlebography.

Aged↗
PubMed1976

[Aneurysms, late complications at the level of anastomosis of an arterial bypass].

The authors report 12 cases of aneurysm occuring in anastomoses in 9 operated patients. The delay of onset of these lesions was long, 9 years on average. The fraquency appears low, slightly greater than 1 p. 100 in all arterial plastic operations. Among the 10 treated lesions half were false aneurysms due to breakdown of the suture and half were true aneurysms due to progression of the arterial dystrophy. All cases were treated by dissection and insertion of a new prosthesis between the old prosthesis and a healthy area, beyond the anastomosis. Out of 9 patients, there were 8 good immediate results and one failure due to infection at the level of the prosthesis. Among the various methods of prevention, avoiding infection may be the most important.

Age Factors↗
PubMed1975

[Necrosis and ischemia of the femoral head during arteritis of the lower extremities. Survey of 138 patients with arteritis and 159 aortographies].

Among 138 subjects suffering form arteritis of the lower limbs, the authors found clinical signs of lesions in one or both hips in 47.6 percent of cases and radiological signs in one or both hips in 42.8 percent of cases. Five patients presented a distinct flattening of the femoral head indicating necrosis at stage III, 19 showed voluminous or multiple dense islets in the femoral collar or head indicating necrotic lesions at stage II, and 26 showed narrowing of the superior joint space mostly on the internal side. The authors think ihat the latter sign indicates ischaemic chondropathy. Eleven of the 138 patients had undergone pertrochanteric phlebography : this was abnormal in all 11 cases. At the same time the authors studied the coxofemorals on 159 aortograms and found, among other anomalies, 2 cases of advanced necrosis at the stage of rupture (stage III). This study tends to confirm the occurrence of necrotic lesions of the femur that are secondary to arteriopathies.

Adult↗