Biomedical subjects
Publications and source records attributed to P Levesque.
The authors report the case of hepatic damage with a favorable outcome, occurring during severe ovarian stimulation which had anatomico-clinical features which distinguished it from the three cases previously reported due to its exclusively cytolytic nature and the histological lesions produced. The physiopathological mechanisms involved are discussed.
The adult respiratory distress syndrome (ARDS) is rarely due to tuberculosis. Two new cases are reported here. Both were female patients, aged 33 and 41 years. The first, of North African origin, was admitted for epigastralgia, hyperpyrexia and intestinal problems. She underwent an exploratory laparotomy, which only showed oedematous mesenteries. Hepatic and lymph node biopsies revealed an ongoing tuberculosis. On the 4th postoperative day, she developed ARDS. Despite an initial period of improvement after proper treatment (antituberculous drugs, steroids, positive pressure ventilation) had been started, she died 27 days later. In the other patient, smoker and alcoholic, the diagnosis of tuberculosis relied only on bacterial culture of various excretions. She also died after 8 days of treatment. In both patients, the symptoms were atypical. The febrile non cardiogenic pulmonary oedema of sudden onset masked the typical miliary mottling pattern on chest X-rays. The life-threatening character of this condition requires that rapid histological studies are carried out to obtain an early diagnosis. Indeed, the precociousness of appropriate treatment seems to be the essential element of the prognosis.
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A case is reported of an acute onset of previously undiagnosed multiple sclerosis, revealed by an oculomotor paralysis following spinal anaesthesia performed for minor orthopaedic surgery. The need for a complete preoperative physical examination is underlined by this case, looking for latent neuromuscular disorders before undertaking such techniques, and for a thorough neurological work-up should such a complication arise. The harmlessness of regional anaesthesia in multiple sclerosis patients is controversial; without entering into such a debate, the direct relationship between spinal anaesthesia and acute exacerbation of the disease in our patient seemed more than likely.
pSVCT3 is a cytoplasmic-localization mutant of simian virus 40 (SV40) isolated from the SV40 adenovirus 7 hybrid virus (PARA) and cloned into plasmid PBR. The large T antigen of pSVCT3 accumulates in the cytoplasm of infected monkey cells instead of being transported to the nucleus. The sole change in CT3 large T antigen is amino acid residue 128 (Lys----Asn). Transformation of precrisis rodent cells by pSVCT3 is negligible, whereas the frequency of transformation of established rodent cell lines by pSVCT3 is comparable to that of wild-type SV40. According to the model, in which transformation of precrisis cells involves the combined oncogenic action of both nuclear and cytoplasmic gene products, we predicted that pSVCT3 would localize in the cytoplasm of human cells and would therefore at most only partially and rarely transform precrisis human cells. We have found that pSVCT3 is able to transform precrisis human cells at high frequency. Furthermore, pSVCT3-transformed human precrisis cells relocalized T antigen to their nuclei. The relocalization of large T antigen was not dependent on cell growth. Wild-type and pSVCT3-transformed human cell lines both have about five copies of integrated SV40 DNA. SV40 virus-specific proteins, including the 100,000-molecular-weight super large T antigen, were expressed in pSVCT3-transformed human cells. Our results suggest that molecules in precrisis human cells, but not cells of other species, are able to complement the cytoplasmic-localization defect of the CT3 mutant large T antigen.
The authors report a case of severe Guillain-Barre syndrome that appeared during the eighteenth week of a second gestation which evolved to full term without complication. The particularity of this observation was that the follow-up of the foetus was made possible for the first time by echography which showed normal active foetal movements even during maximum maternal paralysis. From of review of thirty three cases recorded in the literature, it seems clear that the interrelationship between the neurological disorder and pregnancy is nil or minimal beside an increased risk of prematurity childbirth can proceed normally and cesarean section is not indicated. Plasmapheresis proposed as an early treatment is discussed in the case of pregnant women. Today pregnancy is no longer a particular contraindication of such management.
Acute fatty liver of pregnancy, or Sheehan's syndrome, is a rare complication of pregnancy, occurring in about 0.5% cases of jaundice in pregnancy. The anatomo-clinical picture and the biology of the condition is described using as basis a personal case history and the 28 cases to be found in the French literature. The condition shows, vomiting, abdominal pain and tachycardia in an apyrexial patient in the 3rd trimester of the pregnancy in which the disease occurs. The date shows itself a few days after the prodromal symptoms and is characterised by the triad of pruritus, jaundice and encephalopathy. All cases show an increased white blood count and hyperbilirubinaemia. If the condition goes on to become very serious one has to look for signs of haemorrhage and of liver and renal failure. Liver biopsy confirms the diagnosis. Prognosis will be improved if moderate forms are recognized early and if the condition is watched carefully. It may be necessary to stop the pregnancy before the serious conditions of the illness show up. Labour induced at the 37th week after checks had been made for fetal pulmonary maturity seemed to be a good way of treating the condition even if it has not yet become desperate. The final prognosis for the mother and the baby is always favourable if the baby is born alive.
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The authors report a recent case of primary ulceration of the small intestine revealed by spontaneous perforation. This is a rare condition with a non specific semiology which only exceptionally permits diagnosis before complications occur. The latter are dominated by perforation, gastrointestinal hemorrhage and a sub-acute obstructive syndrome. The lesion, generally single, is found on the anti-mesenteric border of the jejunum or terminal ileum on a short only slightly inflammed segment and pathological examination does not reveal any specific process. Treatment is surgical. It confirms the diagnosis and enables a segmentary resection or simple suture to be carried out. The condition does not recur. A complete etiological investigation is required to exclude other causes of small intestinal ulceration before its "spontaneous" nature may be inferred. Infectious and vascular theories are most often proposed among the pathophysiological hypotheses. Far from being exclusive, these theories may interact and enable a coherent multi-factorial mechanism to be proposed as to the origin of the ulceration (regardless of its initial cause). Spontaneous ulcers are therefore included in a wider nosological classification ranging from stress ulcer to necrosing enteritis.
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