The calculation of dose from external photon exposures using reference and realistic human phantoms and Monte Carlo methods.
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Biomedical subjects
Publications and source records attributed to R Veit.
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Although the principle and duration of prophylactic antibiotic therapy in prosthetic vascular surgery are fairly widely accepted, the choice of antibiotic is still open to discussion. During two successive periods, identical groups of patients received peri-operative prophylaxis with, during period I (455 cases) oxacillin alone and during period II (537 cases) combined treatment with oxacillin and amikacin. The aim of the study was to evaluate efficacy of the association and to draw general conclusions on choice of antibiotic. The addition of amikacin reduced frequency of infection in elective operations, particularly aorto-ilio-femoral prostheses (0.5% as against 1.24%), but not in operations conducted as emergencies. In addition, frequency of infection due to BGN fell only slightly. Finally, combined therapy with oxacillin-amikacin had 2 disadvantages: impossibility of using these antibiotics for prophylaxis alone as provided for in the protocol, and its high cost. Factors of choice of antibiotic should be: efficacy against germs encountered, which can vary from year to year, rarity of toxic or side effects, good tissue diffusion, the rare need for therapeutic use and a low cost.
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A degenerative non atheromatous popliteal aneurysm was observed in a 32 year old woman. At microscopical examination of the aneurysmal shell, the internal elastic-lamina and the muscular fibers of the media appeared to be replaced by a thick acellular collagen layer. No other arterial abnormality was found on a complete arteriography and the etiological screening failed. Therefore the aneurysm was classified as an arterial dysplasia. As far as we know, only two similar cases were previously reported in the literature. The true nature of these lesions remain unknown.
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Operative treatment of spontaneous popliteal aneurysms (S.P.As) is occasionally disappointing. In order to determine the criteria for operation we analyzed retrospectively the fate of 77 S.P.As in 52 patients (mean age, 66 +/- 10 years). S.P.As were divided into 3 groups according to initial symptoms: group I, asymptomatic or mild symptoms, group II, rest pain or toe gangrene, group III, severe ischemia or foot gangrene. Patency rate of arterial reconstruction in groups I, II, III were respectively 83%, 43%, 36%. The course of S.P.As of group I that were not initially operated was not significantly different compared to those operated on, as long as they were frequently reviewed and operated on expeditionaly in cases of complications. The nature of the arterial substitute was the second contributing factor. Quality of run-off had no influence in groups I and II, but was determinant in group III. A good general condition was essential for survival. Operative indications of S.P.As is considered according to classification into 3 groups. Group I: bypass is mandatory, except when the general condition of the patient is poor or when a bad run-off is associated with an unavailable vein. Group II: bypass should be attempted whenever a distal arterial segment seems suitable. Otherwise lumbar sympathectomy may sometimes save a limb. Group III: bypass should be attempted only when the run-off is sufficient and when the tissue damage seems reversible. In the other cases, primary amputation is safer.