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Biomedical subjects

J Baudelot

Publications and source records attributed to J Baudelot.

At least 19 recordsLinked to original sources
PubMed1996

[Transfusion at home? An alternative to the day hospital].

In response to the needs of the Home Medical Services a project was set up in the Hemobiology Transfusion Service of Beaujon Hospital. The objective of this project was to avoid the difficult transfer of patients who were receiving for the most part palliative treatment. This required strict organization between consultants, haemobiologist physicians and healthcare personnel. The exclusion criteria have been respected (geographical distance, state of the non-compensated clinic, absence of family/patient cooperation). During the last 4 years of activity, 1,662 transfusions have been carried out on 757 patients, of which 80% had hematological affections, 10% solid tumours and 10% AIDS affections. 5,548 blood components have been transfused (2,104 red cell concentrates, 3,152 pooled platelet concentrates and 292 apheresis platelet concentrates). Thirty-one minor incidents were observed representing a prevalence of 0.56%. The poor codification of cases has slowed down the development of this project. The centralization of requests with coordination by the haemobiologist physicians within the Paris region should allow a guaranteed response to the numerous requests.

Adolescent↗
PubMed1994

Extracorporeal photochemotherapy: evaluation of two techniques and use in connective tissue disorders.

Extracorporeal photochemotherapy (ECP) consists of collection of mononuclear cells, their irradiation with UV-A light in the presence of a photoactivable molecule--8-methoxy-psoralen (8-MOP) being the most widely used--and their reinjection into a patient. Two technical approaches have been developed. The photopheresis procedure involves four steps: (i) 8-MOP is given to the patient orally, 2 h before collection of white blood cells; (ii) a discontinuous flow cell separator (UVAR, Therakos, West Chester, PA, U.S.A.) is used for cell collection. The final product (740 mL) has a hematocrit of 4.5 +/- 1.7%); (iii) irradiation, performed with the same UVAR apparatus, begins before all the cells are collected, and lasts for 180 min after collection; and (iv) after irradiation, the buffy-coat is reinjected into the patient. We developed a technique summarized as follows: (i) mononuclear cell collection is performed using the Spectra (Cobe, Denver, CO, U.S.A.) cell separator, which provides a highly enriched mononuclear cell concentrate (always > 90% purity), in a small volume < 150 mL, subsequently adjusted to 300 mL for irradiation. Hematocrit of the final product is always < 2%. (ii) Soluble 8-MOP is added to the mononuclear cell concentrate at a final concentration of 200 ng/mL. (iii) Mononuclear cell concentrate is transferred in an EVA plastic bag (Macopharma, Tourcoing, France) to ensure an efficient irradiation with a UV irradiator (Vilber Lourmat, Marne-la-Vallée, France). (iv) After irradiation at 2 J/cm2 (time < 20 min), the cells are reinfused into the patient. Experimental and clinical data suggest that ECP has potential applications in the treatment of connective tissue disorders, such as systemic sclerosis and rheumatoid arthritis. Although encouraging data have been obtained, further clinical trials are warranted to establish the role of this therapy in these indications.

Animals↗
PubMed1994

[From the transfusion informationcard to the tracing of blood products].

The transfusion sheet established in 1985 with the aim of improving the immunological safety has not fulfilled the goal expected. Furthermore, it is now clear that the immunological safety does not necessarily imply transfusional safety only, though alertness in this field should be maintained. The residual post transfusional risk, though limited, should remain a permanent concern both for the transfuser and the prescriptor. "Haemovigilance" has become an integral part of the transfusional safety. It cannot exist without a trace-back of the blood products. At any time it should be possible to determine: "who received what and from whom?" The blood bank has the responsibility for the link between the donor and the blood product and the clinician has the responsibility of the link between the blood product and the recipient. Both partners must be aware of the absolute necessity of sharing and checking all information. Means for this trace-back exist, sophisticated or not, and more or less costly. It is up to each one to select the most suitable system.

Blood Specimen Collection↗
PubMed1994

Long-term plasma exchange. Analysis of indications, outcome and side effects.

In order to determine the characteristics and the course of diseases treated with long-term plasmapheresis (e.g., more than 25 plasma exchanges), we retrospectively studied 850 patients who underwent plasmapheresis. Long-term plasma exchange was prescribed to 38 patients who failed to respond to conventional therapy; cryoglobulinemias, peripheral neuropathies and monoclonal gammopathies were their most frequent underlying diseases. Improvement was noted in 65.8% cases. Only minor side effects were observed and the risk/benefit ratio for such therapy was excellent.

Adult↗
PubMed1990

[Prevalence and epidemiologic features of subjects found to be infected with HIV when donating blood. CTS of the "Retrovirus" Study Group of the Société Nationale de Transfusion Sanguine].

HIV seroprevalence decreased from 0.62% in 1985 to 0.11% in the first 1990 semester. However, the number of regular blood donors screened as seropositive remains constant since 1988: 48 in 1988, 49 in 1989 and 25 in the first 6 months of 1990. From these data, from reports on recipients and due to the exclusion of 30% of such donors by anti-HBc screening, the residual risk to transmit HIV by blood transfusion was estimated to 17 blood donations per year in France. No significant change was observed throughout these years either in sex ratio or in the repartition into age groups. The number of HIV-infected subjects through the heterosexual route has not increased. The number of homosexuals and of IVDA has dramatically decreased since 1985, homosexuals still representing the major at-risk group.

Adult↗
PubMed1989

HIV 2 infection among blood donors and other subjects in France. The "Retrovirus" Study Group of the French Society of Blood Transfusion.

During a 3 year period, from August 1985 to August 1988, 18 HIV 2-infected blood donors were detected in France as a result of systematic HIV 1 screening. These sera were characterized as HIV 2 by specific Western blot and synthetic peptides. Within the same period, 40 other HIV 2 infected subjects were identified by our study group, independently of blood donations. Thirty of these 58 subjects living in France originate from West Africa (8 blood donors), 3 (I blood donor) are Portuguese men who had lived in West Africa and 25 (9 blood donors) are of French origin; among these, 16 have had a known close contact with West Africa. When HIV 2-infected subjects were asymptomatic, cross reactivity between antibodies to HIV 2 and HIV 1 proteins was generally observed with the two-step ELISA assays using total HIV 1 proteins; it was poor with the competitive assays and variable with the assays using recombinant proteins. When the subjects had signs of immunodeficiency, cross reactivity decreased. The data confirm that HIV 2 is not widespread in France and that most of HIV 2-infected but asymptomatic subjects are recognized by several HIV 1 ELISA assays. Accordingly, systematic screening for HIV 2 with an additional test cannot be recommended at the present time, but a combined HIV 1 and HIV 2 test will be useful when available.

Acquired Immunodeficiency Syndrome↗
PubMed1988

[Periarteritis nodosa related to hepatitis B virus. Determination of a new therapeutic strategy: 13 cases].

The treatment and prognosis of periarteritis nodosa associated with hepatitis B virus were reconsidered from a series of 13 patients representing 32.5 per cent of the 40 patients with periarteritis nodosa admitted during the same period. HBs and HBe antigens were present in every case, and hepatitis B virus replication was demonstrated by the finding of viral DNA in serum. One patient had anti-HBc IgM's. Five patients were treated with corticosteroids, cyclophosphamide and occasional plasma exchanges. All were cured or achieved complete remission. Eight patients were treated with plasma exchanges and vidarabine, either as first-line therapy (3 cases) or after failure of corticosteroids and/or immunosuppressants (5 cases). This treatment was clinically effective in 5/8 cases, including 3 with seroconversion. The 2 patients in whom the combined treatment failed were given corticosteroids; one of them also had plasma exchanges. The 8th patient died after a few days of treatment. Eleven of the 13 patients are still alive and either cured or in complete remission. Two patients who developed severe chronic hepatitis after steroids were discontinued received vidarabine alone: arrest of viral replication was obtained in both cases, with emergence of an anti-HBe (but not anti-HBs) antibody. The overall positive virological response rate to vidarabine alone or combined with plasma exchanges was 50 per cent. When vidarabine was prescribed as treatment of acute periarteritis nodosa (the 2 cases where it was used for chronic hepatitis being excluded), this response rate was 37.5 per cent. This, in patients with periarteritis nodosa associated with hepatitis B virus immunosuppressive drugs should be withdrawn and replaced by plasma exchanges and antiviral agents. This would be the first-line treatment to be replaced by corticosteroid therapy if it fails.

Combined Modality Therapy↗
PubMed1987

[Antigens A and B of the HLA system in dilated cardiomyopathies related to alcohol].

It has been hypothesized that dilated cardiomyopathy (DCM) is of dysimmune origin. Conventional immunological studies have provided no evidence that a primary disregulation of immune mechanisms is involved. In the present study, the possibility of an individual predisposition to DCM resting on a preferential distribution of HLA system antigens has been investigated. Typing of the HLA system antigens A and B was performed in a group of 38 DCM patients who were heavy drinkers. The results were compared with those obtained in: (a) 57 alcoholic patients without cardiopathy, and (b) a population of 306 healthy subjects. All subjects were caucasians. Compared with alcoholic patients without cardiac disease, DCM patients had a prevalence of B8 allele. The relative risk of developing DCM was 2.83 in the presence of the B8 antigen. This result suggests a genetic predisposition to DCM: the B8 allele, prevalent among our patients, is associated with the phenotype of numerous autoimmune diseases. This study therefore supports the theory that DCM is of dysimmune origin, but this must be confirmed by further investigations conducted on a larger number of cases.

Adult↗