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Biomedical subjects

D Roux

Publications and source records attributed to D Roux.

At least 127 records · Page 7Linked to original sources
PubMed1987

Liver sinusoids and sinusoidal cells in patients with agnogenic myeloid metaplasia.

The origin of sinusoidal portal hypertension often remains unknown in patients with agnogenic myeloid metaplasia. Four consecutive patients with agnogenic myeloid metaplasia had liver biopsies examined under light and electron microscopy. Two of the four had obvious clinical portal hypertension; of these two, only one had portal vein thrombosis. All four cases showed sinusoidal infiltration by myeloid cells (from very mild to obvious) and an increased perisinusoidal collagen network. Under electron microscopy we observed (a) the collagenization of the Disse space, (b) myeloid cells in the lumen and the Disse space, (c) the transformation of perisinusoidal cells into transitional cells, and (d) fragments of basement membrane-like material. It is possible that all these abnormalities, and not only sinusoidal infiltration, contribute to increase vascular resistance, even when there is no clinical evidence of portal hypertension unrelated to vascular thrombosis.

Aged↗
PubMed1987

[Therapeutic problems posed by hemiballism of metastatic origin].

A 40 year old woman undergoing treatment for cancer of the breast presented with metastatic hemiballism. Diagnosis was supported by the presence of bone and liver metastases and by CT-scan showing an enhanced rapidly growing lesion in the subthalamic region contralateral to hemiballism. Treatment by corticotherapy and neuroleptics was ineffective. Radiotherapy was unsuccessful. Metastatic hemiballism is a rare disease with no effective treatment.

Adult↗
PubMed1987

"Campylobacter pyloridis" and epigastric pain: endoscopic, histological, and bacteriological correlations.

Campylobacter pyloridis is a newly discovered bacterium which has been implicated in gastric pathology. C. pyloridis was looked for by hematoxylin and eosin staining and culture (chocolate and brucella blood agar) in gastric antral biopsies in 136 unselected patients suffering from epigastric pain. The distribution of C. pyloridis positive cases according to the endoscopic diagnosis was as follows: duodenal ulcer (19 positive/21 tested), duodenitis (6/10), gastric ulcer (9/21), gastritis (13/26), and normal endoscopy (21/58). The association was statistically significant for duodenal ulcers (p less than 0.001). All of the 68 C. pyloridis positive patients showed histologic signs of gastritis as compared to 29 of the 68 C. pyloridis negative patients. The two techniques detection were comparable in sensitivity: 57 were detected by culture only and 63 by microscopy only. We also looked for C. pyloridis in biopsies of the body of the stomach in 71 patients. Bacteria were found in 33 of 36 cases with C. pyloridis positive antral biopsies (15 had histologic lesions) but only in 2 of 35 C. pyloridis antrum negative cases. Therefore, C. pyloridis was tightly associated with histologic signs of antral gastritis and with duodenal ulcers when diagnosed by endoscopy.

Adult↗
PubMed1986

[Thrombosis of the superior vena cava disclosing Behçet's disease].

The authors report the case of a 29 year old North African patient with Behçet's disease presenting with sudden thrombosis of the superior vena cava. Venous disorders are the fourth major sign of this disease. Although superficial thrombophlebitis is a common presenting sign, caval thrombosis is rare and usually occurs after several years' evolution. Superior vena caval thrombosis may be life threatening due to complications such as pulmonary embolism and haemoptysis. The anatomical substrate of this form of vascular disease is the same as that of the other visceral lesions of Behçet's disease: predominantly venous vasculitis with perivascularitis and secondary thrombosis. The pathogenesis of this thrombotic diathesis is discussed.

Adult↗
PubMed1986

Ultrastructure of sinusoids in patients with agnogenic myeloid metaplasia.

Four patients with agnogenic myeloid metaplasia underwent liver biopsies. Under light microscopy, sinusoidal infiltration was very mild or moderate, liver architecture was normal with sinusoids slightly dilated and the perisinusoidal collagen network was increased. Under electron microscopy, in perfusion-fixed sinusoids, the following abnormalities were noticed. a) Presence of hemopoietic cells (erythroid, megakaryocytic, lymphoid, myeloid) at different stages of maturation. More frequently observed in the lumen than in the Disse space, they were usually isolated and never exceeded 2 or 3 cells. In the Disse space, hepatocytes in contact with hemopoietic cells were devoid of microvilli. In the lumen they were close to endothelial cells and Kupffer cells. Kupffer cells were numerous with intense phagocytic activity. b) Numerous collagen bundles encircling sinusoids. c) Transformation of perisinusoidal cells into transitional cells with few lipids, prominent RER, long and thick processes containing filaments sometimes condensed below the plasma membrane. Although only one patient showed clinical evidence of portal hypertension of sinusoidal origin, these results suggest that hepatic vascular resistance might be raised in agnogenic myeloid metaplasia.

Cell Adhesion↗
PubMed1985

Comparison of the effects of rabies virus infection and of combined interferon and poly(I).poly(C) treatment on the levels of 2',5'-adenyladenosine oligonucleotides in different organs of mice.

Intracellular levels of 2',5'-adenyladenosine oligonucleotides were analyzed in different organs of mice during the course of a rabies virus infection. Phosphorylated and nonphosphorylated 2',5'-adenyladenosine oligonucleotides were measured by radioimmunoassay and analyzed further by HPLC. As the infection progressed, concentrations of phosphorylated 2',5'-adenyladenosine oligonucleotides increased strongly, reaching their maxima late in the infection. In contrast, concentrations of the nonphosphorylated 2',5'-adenyladenosine oligonucleotides decreased. A similar phenomenon was observed in spleens analyzed at intervals after treatment of noninfected mice with interferon and poly(I).poly(C) and to a lesser extent after treatment of noninfected mice with interferon and poly(I).poly(C) and to a lesser extent after treatment with poly(I).poly(C) alone, but not after treatment with interferon alone. The products which accumulated during virus infection were primarily phosphorylated dimers whereas during combined interferon and poly(I).poly(C) treatment, the entire range of phosphorylated molecules from dimer to pentamer was present. These data show that infection of mice with rabies virus provokes both the induction and the activation of 2-5A synthetase, as does interferon and poly(I).poly(C) treatment. However, our data indicate that the intracellular products are different in the two situations: the species active on the nuclease were only detected in interferon- and poly(I).poly(C)-treated mice. The absence of molecules able to activate the 2-5A-dependent nuclease in virus-infected mice might well be one of the reasons why the interferon system is ineffective in rabies virus infection.

Adenine Nucleotides↗
PubMed1985

[Extrinsic allergic alveolitis and hematologic diseases (lymphoproliferative syndromes)].

The authors report 2 cases of hypersensitivity pneumopathy associated with haematological abnormalities: benign lymphoproliferative syndrome in one case, and malignant lymphadenopathy with fatal outcome in the other case. Such cases, now observed with increasing frequency, can be regarded either as chance associations of 2 types of disease, or as the results of immune disorders with repercussions on the blood.

Adult↗
PubMed1984

[Prevention of poliomyelitis: live or killed vaccine? Remarks apropos of 2 cases of poliomyelitis].

The attenuated poliovirus vaccine is remarkably effective in preventing the disease but its innocuity has always been questioned. It seems to be responsible for occasional cases of spinal paralysis occurring in developed countries where poliomyelitis has virtually been eradicated. The authors report two cases of acute anterior poliomyelitis in young adults, in which the poliovirus recovered from the faeces might have been of vaccinal origin. Virological techniques do not always characterize the strains isolated, nor distinguish between a vaccinal mutant and a wild poliovirus. These data, together with previously published cases, have prompted the authors to discuss whether the use of a live poliovaccine is justified.

Adult↗
PubMed1984

Immunological evidence for the in vivo occurrence of (2'-5')adenylyladenosine oligonucleotides in eukaryotes and prokaryotes.

A monoclonal antibody highly specific for (2'-5')adenylyladenosine oligonucleotides was used together with a 125I-labeled analog of this compound to detect and quantify phosphorylated and nonphosphorylated (2'-5')adenylyladenosine oligonucleotides in a variety of tissues and cells. These oligonucleotides were first assayed as a whole in perchloric acid extracts and then further individually characterized by HPLC analysis. Their sensitivity to alkaline phosphatase, snake venom phosphodiesterase, and T2 RNase was systematically checked. Nonphosphorylated (2'-5')adenylyladenosine oligonucleotides were found in mammalian tissues as well as in yeast and bacteria. In normal mouse brain, lung, heart, pancreas, spleen, kidney, and liver their concentrations ranged from 10 to 200 pmol/g wet weight, depending on tissue and strain. The oligonucleotides were mainly dimers, trimers, tetramers, and pentamers. In addition, phosphorylated (2'-5')adenylyladenosine oligonucleotides were shown in liver and kidney extracts.

Adenine Nucleotides↗
PubMed1984

[Aneurysm of the gluteal artery].

A 90 year old man developed the rare lesion of an aneurysm of the gluteal artery, provoked by an injury in a patient with atheromatous multiple aneurysm disease. The inflammatory and permanent nature of the sciatic pain, the history of a recent increase in size of the buttocks, as well as signs of a deglobulization suggest the need for urgent arteriographic exploration for precise definition of the arteries supplying the aneurysm. Surgical treatment is by primary ligature of the hypogastric artery associated with a direct approach in order to perform endoaneurysmorhaphy.

Aged↗
PubMed1984

[Aneurysm of the infrarenal abdominal aorta in octogenarians. Apropos of a series of 30 consecutive cases].

UNLABELLED: The authors report a series of 30 operated consecutive infrarenal abdominal aneurysms on patients aged of 80 years old or more. The operation is necessary in emergency in 13 cases (43.3%): 10 patients with sudden severe abdominal pain and faintness and 3 with rupture. In 17 cases the indication of surgery is "elective" (56.7%): sole physical finding in 10 cases, one case of ureteral tract compression and 6 cases of recent pain. In 13 cases, the infrarenal aneurysm is associated with arterial occlusive disease. In 20% of the cases, the operation consists on aorto-aortic bypass graft; in the other cases, aorto iliac bypass is necessary; in 3 cases the distal implantation of the graft is on the groin, on the femoral artery. The hospital mortality is 20% of the cases (6 cases); after operation in emergency the mortality is higher (30.6%) than after elective surgery (11.7%). The mean of the late follow up is of 39 months (2 months to 9 years): the late mortality is 16.6% of the cases (5 cases). The actuarial percentage of survival at 4 years is 60%. CONCLUSION: The elderly is not a contraindication for surgical treatment of the infrarenal aortic aneurysm. The late survival rate is good after the operation.

Aged↗