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Biomedical subjects

A Jover

Publications and source records attributed to A Jover.

At least 37 records · Page 2Linked to original sources
PubMed1992

Detection of African swine fever viral antigens in paraffin-embedded tissues by use of immunohistologic methods and polyclonal antibodies.

Tissues obtained from pigs inoculated with African swine fever virus (ASFV), fixed by vascular perfusion using glutaraldehyde, and embedded in paraffin or araldite were used for an immunohistologic electron microscopic study. To detect ASFV antigens, 4 methods were used on paraffin sections with or without pretreatment of the tissues. Use of biotinylated anti-ASFV antiserum combined with avidin-biotin complex and peroxidase proved to be the most suitable method, and antigen was detected in tissues infected with 2 ASF viruses of different virulence. Use of the glutaraldehyde fixation method should ensure optimal morphologic (structural and ultrastructural) data while allowing an immunohistologic study, and add to knowledge of the pathogenesis of ASF.

African Swine Fever↗
PubMed1992

[Light and electron microscopic findings in the intestine of spontaneous and experimentally-produced African swine fever].

Light and electron microscopical studies were carried out after experimental induced and spontaneous infection with African swine fever virus. The experimental infection was performed in 18 pigs divided into two groups consisting of 9 animals. The pigs of group I were inoculated with virulent isolate E 70, those of group II with attenuated isolate E 75. Two infected pigs of group I and one control animal were killed on days 3, 5 or 7 p.i., two pigs of group II and one control animal were killed on days 9, 11 or 13 p.i. Additionally 19 spontaneous infected and seropositive animals and two seronegative pigs without clinical signs were examined. Infection with African swine fever virus resulted in slight morphological alterations of the intestine. The pathological findings showed a more intense involvement of the large intestine, especially the caecum and colon, than the small intestine, where the ileum was mostly affected. In all three groups edema and vacuolisation could be observed in endothelial cells. In spite of beginning degenerative signs, especially after spontaneous infection, the fenestrated structure of the endothelium was conserved in most of the cases. In animals infected with virulent isolate the vascular lumina contained aggregations of fibrin, which was severe pronounced in the pigs of the other groups. In the area of these alterations disturbance of permeability with extravasation could be found. In all groups single virions or virus aggregates could be identified in concave depressions of the erythrocyte membrane or free within the blood plasma, in some cases enveloped by a plasma-like material.(ABSTRACT TRUNCATED AT 250 WORDS)

African Swine Fever↗
PubMed1990

Pulmonary intravascular macrophages in lungs of pigs inoculated with African swine fever virus of differing virulence.

The role of pulmonary intravascular macrophages (PIM) in a viral infection has been studied by structural and ultrastructural methods with two strains of the African swine fever (ASF) virus: the virulent strain E70 and the attenuated strain E75. Pulmonary intravascular macrophages were the cells of the mononuclear phagocyte system of the lung most involved in the replication of strain E70, showing a marked cytopathic effect and necrosis. Concurrently, their size and number increased sharply. This stimulation of PIMs by the virulent strain of the ASF virus, together with the cytopathic effect, might be the cause of the abundant masses of cell debris found in septal capillaries and thus be related to the pulmonary oedema that characterizes the acute forms of the disease. With the attenuated strain of the ASF virus, stimulation of PIMs, as well as viral replication within them, was also intense, but the cytopathic effect was less. Later, in the course of the infection, the number of PIMs decreased sharply and then alveolar macrophages increased, bearing most of the viral replication and signalling the onset of a pneumonic process.

African Swine Fever↗
PubMed1989

Immunohistological identification of both infectious bursal and Marek virus antigens in the bursa of Fabricius.

Indirect Immunoperoxidase (IIP) and Avidin Biotin-Peroxidase Complex (ABC) techniques were used for the detection of Infectious Bursal Virus (IBV) and Marek Disease Virus (MDV) antigens in alcohol and formalin-fixed, paraffin-embedded lymphoid tissues from broilers. Both techniques appeared potentially useful for the diagnosis of both viral antigens in alcohol-fixed tissues, and allowed the observation of dual infection in the bursa of Fabricius of the studied animals in a natural infection.

Animals↗
PubMed1987

Prevalence of legionellosis among adults: a study of community-acquired pneumonia in France.

Over a 24-month period, 274 patients with community-acquired pneumonia were hospitalized in Departments of Medicine at hospitals in Bordeaux, Lyon, Marseille, and Toulouse. Etiology of the pneumonia was determined either by organism identification or by indirect immunofluorescence in only 139 cases (51%). The most frequently isolated etiological agents were Streptococcus pneumoniae (34 cases), Legionella pneumophila (29 cases) and Mycoplasma pneumoniae (24 cases). The majority of patients with legionellosis were male (79%), middle aged (mean age: 53 years), and living in urban areas (69%). Their clinical features were atypical and did not differ from those of other pneumonias. Four patients with legionellosis (13.8%) died. L. pneumophila was isolated directly in only three instances. The study confirms the high prevalence of legionellosis (20%) among pneumonias of identified etiology. The fact that these cases had an atypical clinical presentation and that isolation of the organism was difficult reinforce the need to apply the CDC criteria for the interpretation of positive serological titers.

Age Factors↗
PubMed1985

[Cardiac tolerance of a beta-2-sympathomimetic spray: fenoterol. Apropos of 37 patients followed using a Holter monitor during a brief treatment protocol].

37 subjects with stable asthma and a mean age of 50.3 undertook a protocol to study the cardiac tolerance to a spray B2SM. A Holter monitor was performed before and 48 hours after the institution of a Fenoterol spray in 4 daily doses of 600 micrograms at fixed times. Before starting treatment with a beta 2 sympathomimetic spray (B2SM) 11 subjects had abnormal traces with significant auricular extra-systoles in 4, ventricular extra-systoles in 5 and both in one subject: one patient had a run of ventricular tachycardia without symptoms. On Fenoterol, a worsening of pre-existing extra systoles was noted thrice, one was auricular the other two ventricular. Two patients had brief runs of ventricular tachycardia but the role of Fenoterol was uncertain; one of the patients was very elderly and hypoxaemic. In the second and elevated theophylline level of 20 micrograms/l was noted. The arrythmogenic power of a B2SM seems weak, but in certain situations such as hypoxaemia, metabolic acidosis and overdosage of theophylline, over consumption of B2SM in association with the above factors could contribute to serious arrhythmias. Also in this study in which there was a protocol limited in time, no premature conclusion should be made on the crucial problem of the cardiovascular risks of B2SM in the basic treatment of asthma but raises the problem of the arrythmogenic potential of the drug association of Theophylline + B2SM.

Adult↗
PubMed1985

[Thromboembolic disease in pneumology. Value of mercury-gauge plethysmography with venous occlusion].

Mercury gauge plethysmography with venous occlusion (PJC) is an atraumatic procedure for the diagnosis of deep venous thrombosis (TVP) of the lower limbs: 103 patients were studied both by plethysmography and phlebography (the reference examination). 54 were hospitalised for a suspicion of pulmonary emboli (EP), 21 for clinical phlebitis and finally 28 subjects had the studies as part of a systematic work-up. 60 cases of TVP of the lower limbs were discovered: 47 were recent, 34 were proximal and 13 sural. The clinical examination failed to reveal these in 36% of cases; the phlebographic and PJC results were concordant for 75% of cases: PJC seemed particularly to be the technique of high sensibility for the early diagnosis of proximal TVP but of a lesser interest for the early diagnosis of peripheral TVP (sensibility 69%). This examination makes an important contribution: for the early diagnosis of hidden proximal TVP; for the diagnosis of EP in its deceptive forms where the presence of a peripheral embolic focus constitutes one weighing factor towards the diagnosis of peripheral thrombo-embolic disease (MIE); for the control of anti-coagulant therapy in the clinic where the local inflammatory process and the biology controlling the consumption of heparin are jointly observed and the study of venous drainage allows an appropriate decision to be made as to the cessation of anticoagulant therapy and minimises the risk of recurrence or avoiding postphlebitis disease by a prolonged treatment.

Anticoagulants↗
PubMed1984

[Hepatitis B virus markers and lymphocyte populations in the asymptomatic multiple-drug addict].

The authors have studied in particular hepatitis B virus markers and the ratio of OKT4+/OKT8+ cells in two subgroups of 52 deprived asymptomatic drug addicts. In the group 1 (deprived for 19 days on an average), 52% of the subjects showed a ratio of OKT4+/OKT8+ less than 1, whereas in the group 2 (deprived for 30 months on an average), this percentage is only of 25%. HBV markers were present in 90% of the subjects in each group. We would like to point out the high frequency of the anti-HBc positivity without other markers in these two groups, respectively 20% in the group 1 and 32% in the group 2. These results emphasize the interest in screening systematically this marker in all blood donors.

Adolescent↗
PubMed1984

[Cytology and phospholipid content of the bronchoalveolar lavage liquid in diffuse interstitial pneumopathies and in sarcoidosis. Apropos of 96 lavages].

The phospholipid content of bronchoalveolar lavage (LBA) has been little studied till now. This work involved 96 LBA on 7 cases of allergic alveolitis, 11 cases of diffuse interstitial fibrosis (FID) and 42 of sarcoidosis. The liquid collected was submitted to a cellular study (cellularity, total and differential) and biochemical (total proteins, total phospholipids separated into their different fractions by chromatography which enabled the identification of phosphatidyl-choline, phosphatidyl-serine and phosphatidyl-inositol in particular). The cytological results were close to the classical data, a rise in the lymphocyte level in allergic alveolitis and active sarcoid, a rise in polymorphonuclear cells in FID. Biochemical analysis showed a fall in total phospholipids for the whole group, the drop being the greatest in the FID. Phosphatidyl-choline, the principle phospholipid of surfactant in normals, was reduced in all three groups of patient when expressed as a percentage of total phospholipids. This fall was greatest with an allergic alveolitis and occurred on a pro rata basis with a rise in phosphatidyl-serine and inositol. The protein phospholipid ratio (PL/P) expressed in micrograms of phospholipid and milligrams of protein fell in a significant fashion in all the pathological groups. This fall was significantly larger in allergic alveolitis than FID and active sarcoid. The PL/P ratio seems to be a good marker of active sarcoid, correlating with the activity of the disease inversely with the lymphocyte level, and was unchanged by steroids unlike the lymphocyte count. A rise in this ratio correlates with an improvement in the radiological and clinical state.

Adolescent↗
PubMed1981

[Noxytioline in the local treatment of empyema (author's transl)].

The importance assumed by local treatment in non-tuberculous purulent pleurisy has suggested that intrapleural applications of a broad spectrum antiseptic could be as useful as in peritonitis. Fifteen adult patients with empyema secondary, in most cases, to local, usually Gram-negative, infections were treated with combined antibiotic therapy and locally administered noxytioline. The patients underwent 3 to 30 intrapleural lavages (average 9) via a pleurotomy drainage tube (11 cases) or after pleural puncture (4 cases). Results were very satisfactory in 12 out of 15 cases, with mild pleural sequelae in 8 cases. No local or systemic reactions were observed. This treatment proved particularly effective in 5 difficult cases.

Adult↗
PubMed1981

[Indications for intrapleural talc under pleuroscopic control in malignant recurrent pleural effusions. Based on 26 cases (author's transl)].

A review of ten years' experience of talc pleurodesis applied to the treatment of permanently recurrent carcinomatous pleural effusions. Twenty six patients aged between 35 and 83 years, suffering from metastatic pleural effusions, underwent pleuroscopy with local anaesthesia followed by powdering with talc, then suction drainage. There were 8 failures (30%), including 4 early deaths and 4 survivals of less than 4 months with no reduction in the effusion. Three results proved to be poor because of early extra-thoracic metastases (11.5%). There were 15 useful results, with drying up without return of the effusion and comfortable survival for 3 months to 7 years, including 8 of more than a year. These figures, somewhat unfavourable in comparison with those found in the recent literature (up to 90% useful results) were biased by the inclusion of patients who were in fact beyond help (excessive age, markedly impaired general condition, too advanced pleuro-pulmonary lesions, multiple metastases) which represent classical contraindications to the use of the talc technique. It emphasizes the best indications, based upon a sufficiently long life expectancy, good local pleuro-pulmonary state, the virtual restriction of malignant disease to the pleura, residual therapeutic possibilities-all conditions frequently found in cases of pleural carcinomatosis of mammary origin.

Adult↗
PubMed1979

[Value of vascular tests in the diagnosis and therapeutical indications of pulmonary embolism on a pneumological background (author's transl)].

The diagnosis of mislaying forms of pulmonary embolism, where even angiography was not pathognomonic, induced the use of a phlebography on lower limbs in patients where this diagnosis was suspected. The revelation of a distal thrombo-phlebitis and even more so an iliocaval one, becomes a major value when the clinical and paraclinical data remained arguable. The comparative study of diagnostic usual clinical and paraclinical elements (radiographies, E.C.G., gasometries and scintigraphies) confirmed, in 22 patients, the value of phlebography. On a pneumological background, it is useful to perform this examination, most of the time : a) on patients over 55, when a cardiorespiratory decompensation remained unexplained in a patient with chronic respiratory insufficiency, or even an unproved hemoptysis; b) but mostly before 55, in case of painful pneumopathy above all if it is bilateral and recurring, or in case of paroxysmal bronchospasm without atopic ground, when a belated asthma could be thought of. Finally vascular tests induced the fitting in situ of a clamp or "umbrella" in the vena cava in 7 patients out of 22.

Adult↗
PubMed1979

[Isotopic indicators in the diagnosis of malignant pleurisies (author's transl)].

The tracers that are used in thoracic pathology have an elective tumoural affinity, present such a special reaction towards pleural effusions that we were led to study Bleomycin labelled with Cobalt 57 in 34 cases of pleurisy of various etiologies. The hyperfixation, circumscribed to the effusion in all these cases, presented a double problem : of radiobiological risk and of diagnostic significance. We tried to solve the last problem by means of a precise protocol applied to 16 cases, quantifying comparatively the specific radio-activity of pleural fluid and serum and studying the evolution of the pleural serous gradient, after injection of 2 mCi of labelled Bleomycin in 16 patients with suspected malignant pleurisy. From this limited study, it appeared that the sero-pleural gradient of the tracer, 24 hours after injection, was very high, above 5 and up to 15 in 7 malignant pleurisies out of 8; between 2 and 4 in others. It was sometimes below 5 and less in effusions, non malignant or doubtful. This gradient decreased very rapidly to reach 0 on the fourth day, except in recurring chronic effusions. Pending the confirmation of results, after a prolonged experiment, this protocol appeared valuable for diagnostic and physiopathological reasons.

Adult↗