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Biomedical subjects

L Diakhate

Publications and source records attributed to L Diakhate.

At least 19 recordsLinked to original sources

[Epidemiologic aspects and medical-social impact of hemophilia at the University Hospital Center in Dakar].

The epidemiology and medico-social impact of hemophilia is poorly understood in Africa due to low incidence of the disease and lack of trained hematologists and adequate laboratory facilities. The purpose of this report is to describe our experience with the organization of regular follow-up for hemophilia patients at the University Hospital Center in Dakar, Senegal. A total of 54 patients with type A hemophilia were included in this three-year study. Moderate forms of hemophilia were the most common (55.6%) followed by severe (29.6%) and minor (14.8%) forms. There was no significant difference in mean patient age according to disease severity, i.e., 19.3 years for patients with severe forms, 13.4 years for patients with moderate forms and 15 years for patients with minor forms. Patients over 20 years of age accounted for 27.9% of the study population. The remaining patients were younger, i.e., between 10-19 years (33.3%) and between 1 and 9 years (38.8%). Eighty-seven percent of patients lived in Dakar and the remaining 13% were from various regions of the country. Among the 54 patients in this study, there were 38 (70.3%) with no hemophiliac brother in the family, 13 (24.1%) with one hemophiliac brother and three (5.6%) with two hemophiliac brothers. Osteoarticular damage was found in 28 patients (53.8%) involving the knee in 22, elbow in 18 and ankle in 9. Four patients were positive for HBs Ag (7.4%) and one patient for HIV. Professional or scholastic activity was possible in 69.2% of patients under 20 years old and 46.6% over 20 years old. Although results are still inadequate, a clear-cut improvement has been noted in the survival and quality of life of hemophiliacs in comparison with previous years. These findings show the value of regular surveillance for hemophilia patients in countries with limited resources.

Adolescent↗

Immunologic and virologic response after tetanus toxoid booster among HIV-1- and HIV-2-infected Senegalese individuals.

Twelve HIV-1-infected, nine HIV-2-infected patients and eight HIV-negative subjects were given a 40IU booster dose of tetanus toxoid (TT). Blood was collected on days 0, 7 and 30 after immunization. Changes in HIV-1 or HIV-2 RNA load were evaluated by nested PCR. TT-IgG antibody levels were quantified by ELISA. CD4 cell counts as well as activation, memory and maturation markers of T lymphocyte subsets were determined by flow cytometry. The induction of apoptosis was investigated using 7-aminoactinomycin D (AAD) and propidium iodide (PI) staining. Proliferative responses to TT and pokeweed mitogen (PWM) were determined by the level of [(3)H] thymidine incorporation. Seven and 30 days after immunization, there was no detectable increase in HIV-1 or HIV-2 plasma load. There were also no changes in CD4 cell counts, CD69, HLA-DR and memory CD45RO or naive CD45RA antigens. Immunization did not increase the spontaneous apoptosis of peripheral blood mononuclear cells (PBMCs), CD4+ and CD8+ T cells subsets neither in controls nor in HIV-infected patients. Similarly, apoptosis induced in vitro by PWM or by the specific TT recall antigen did not vary during the study period. The proliferative response to PWM and to the TT recall antigen was decreased both in HIV-1- and HIV-2-infected patients compared to HIV-negative controls. Immunization significantly increased the TT-IgG levels in healthy controls and in HIV-infected patients. However, the anti-TT-IgG response, as measured by the fold-increase index between days 0 and 30, was significantly higher in healthy controls than in HIV-1- (P=0.036) and HIV-2-infected patients (P=0.003). In conclusion, we found no deleterious immunologic or virologic effect was detected in healthy HIV-1- and HIV-2-infected individuals after antigenic challenge with a TT booster. However, the response to TT vaccination was lower in HIV-1- and in HIV-2-infected individuals than in healthy HIV-negative controls.

Adult↗

Serological HLA class I alleles in Senegalese blood donors detected HBs Ag positive.

We analysed the HLA class I alleles in 96 blood donors HBs Ag positive compared with 93 healthy control individuals (HBs negative). The most frequent HLA-A, -B, -C alleles found were, A23 (33.6%); A2 (25%); A30 (25%); B8 (31.5%); B7 (16.3%); B58 (11.9%); B35 (11.9%); B49 (11.9%); B53 (10.8%); Cw7 (39.1%); Cw3 (36.9%); Cw4 (36.9%). Significant differences (P<0.001) were found between the blood donors and the controls for the following HLA alleles, A1; A23; B8 and Cw3. The detection of HBe antigen was positive in 26/84 blood donors. It was observed a significant difference (P<0.01; odds ratios (OR)=6.25) between positive and negative HBe antigens blood donors for HLA-A1 allele.

Adolescent↗

New results in clinical severity of homozygous sickle cell anemia, in Dakar, Senegal.

Despite the unicity of its genetic mutation, Sickle cell homozygosity presents different clinical features. Our objectives were to evaluate disease severity in Senegalese patients. Sixty (60) homozygous sickle cell patients were followed up monthly during one year and disease severity was assessed using the "severity index" (SI) which is resulting from epidemiologic, clinic and biological data. Mean age was 20.13, sex ratio was 0.87 and mean age of diagnosis was 9.8 years. 90% of patients presented vaso-occlusive crisis (2.53 per patient), 73.3% had infectious episodes (1.9 per patient), 69.3% had never been transfused and 25% of patients had presented chronic complications linked to anemia or ischemia. Mean hemoglobin value was 8.1 g/dl and mean Hb F was 8.2%. Low seric ferritin was found in 1.7% of patients. Benign form of homozygous sickle cell anemia (SI< or =6) was found in 48.3% of patients. Our data confirm the relative good tolerance of homozygous sickle cell disease in Senegal. The haplotype Senegal may play an important role but others host and environmental factors operate certainly because some severe cases were identified in our patients. The identification of all these factors might contribute to a better follow up of sickle cell disease.

Activities of Daily Living↗

[Hematologic abnormalities and immunodepression in HIV/AIDS- related pulmonary tuberculosis].

Our objectives were to describe hemato-immunological abnormalities encountered in tuberculosis patients HIV seropositive (TBVIH+, n = 67) or not (TBVIH-, n = 39) and in HIV asymptomatic patients (aSVIH+, n = 40). We found: a great reduction of mean value of RBC and Hb in TBVIH+ and TBVIH-; a reduction of mean value of leucocytes, total lymphocytes and CD4+ lymphocytes in TBVIH+ and aSVIH+; an inversion of [formula: see text] ratio, more important in TBVIH+ than in aSVIH+. HIV and tuberculosis association, HIV1 serotype and CD4 < 200/mm3 were found to promote significantly hemato-immunological abnormalities.

Acquired Immunodeficiency Syndrome↗

[Protein C, protein S and antithrombin III at normal delivery and during abruptio placentae].

Protein C, Protein S and Antithrombin III were screened in one hundred patients admitted for abruptio placentae and one hundred women who delivered normally in Dakar university hospital. We found a reduction of Protein S at normal delivery which is linked to hypercoagulation activity during this process. PC and PS were significantly decreased during abruptio placentae in relation with the disseminated intravascular coagulation which was found in our study. We recommend to include these tests to explore aetiologies of abruptio placentae and to confirm their congenital deficit two months after delivery.

Abruptio Placentae↗

[Biermer's disease without anemia: apropos of 2 cases manifested as glossitis with macrocytosis].

Although it is recognized that glossitis is a classical sign of pernicious anemia, occurring in the evolution of this disease, it is unfrequent for this sign to reveal this affection. We report two cases where diagnosis was evacuated on the presence of glossitis and macrocytosis despite absence of anemia. Confirmation was done by low serum cobalamin level, gastritis atrophy and presence of intrinsic factor antibody. We emphasize that increased clinical suspicion may lead to early diagnosis even if anemia is lacking.

Aged↗

[Association between Class I HLA alleles and HBs antigen carrier status among blood donors in Senegal].

The course of hepatitis B virus (HBV) infection may be influenced by the host immune response. A prospective study was carried out in ninety-eight subjects (mean age = 23 years) HBs antigens carriers of hepatitis B and living in Dakar, Senegal. We analysed the HLA-A, -B, and C antigens distribution compared to that one of a control (HBs negative) healthy senegalese population (n = 96) living in Dielmo village where a longitudinal study was set-up since 1990. The HLA class I typing was performed by microlymphocytotoxicity assays. The most frequent HLA-A, -B, -C antigens found were: locus A: A23 (33.6%), A2 (25%), A30 (25%), locus B: B8 (31%), B7 (16.3%), B58 (11.9%), B35 (11%), B49 (11%), B53 (10.8%) and locus C: Cw7 (39.1%), Cw17 (39.1%), Cw3 (36.9%), Cw4 (36.6%). Significant differences (P < 0.001) were found between the donors and the control group for the following HLA antigens: A1, A23, B8 and Cw3. The detection of HBe antigen was positive in 26/84 blood donors. It was observed a significant difference (p < 0.01) between positive and negative HBe donors for HLA-A1 allele with an odds ratio of 6.25. All the donors carrying the HLA haplotype: A1-B8-Cw7 (11.5%) were positive in HBe antigen. HLA: B8-Cw7 haplotype (detected in 8.5% of positive donors) seems to be likely associated with a liver cancer according to many reports. An adequate follow-up should be set-up for positive HBe subjects carrying a susceptible HLA type.

Adolescent↗

Presenting features at diagnosis and complications of hemophilia in Dakar: apropos of 25 cases.

In order to describe the presenting features at diagnosis and complications of hemophilia in Dakar, we conducted a study of hospital records between October 1991 and January 1993. Twenty-five cases of hemophilia were identified. We found that only 4% of our patients were diagnosed in the first 6 months of life whereas 64% of patients were diagnosed between 6 months and 5 years of age, 32% were detected between 5 years and 14 years of age. The presenting feature at diagnosis was external bleeding in 60% of cases and internal bleeding in 40%. 92% of cases were hemophilia type A and only 8% hemophilia type B. 56% of patients had mild hemophilia, 40% moderate and only 4% severe disease. Hemophiliac arthropathy was present on radiography in 76%. Complications were dominated by repeated joint bleeding, which was present in 92% of patients, and repeated hematomas (80% of patients). A functional handicap was present in 60% of cases. 12% of transfused hemophiliacs developed an inhibitor and 4% of patients were HIV positive. Greater awareness of hemophilia amongst the medical community as well as continued efforts to improve care for hemophiliacs in Senegal are necessary.

Adolescent↗

Epidemiology and therapy of malignant hemopathies in Senegal.

The objectives of this study were to determine the prevalence of malignant hemopathies among patients in Dakar hospital and to examine the current methods of treatment in Senegal. A retrospective analysis of patients diagnosed in Dakar hospitals from 1st January 1986 to 31st December 1992 revealed 210 cases of malignant hemopathies, but only 155 patient records were retrieved (73.8%). The prevalence of malignant hemopathies was 7/1000 and males were predominant with a sex ratio of 1.6 (p = 0.0001). Acute leukaemias (AL) appeared mainly in young people with a mean age of occurrence of 18.8 years, while immunoproliferative syndromes (IS) and myeloproliferative syndromes (MS) were mostly found in adults with respective mean ages of occurrence of 38.9 and 38.7 years (p = 0.000004 AL vs IS, p = 0.00001 AL vs MS). Concerning therapy, 14.2% of patients died without treatment and 26.1% received only symptomatic treatment. Chemotherapy was employed in 61% of cases, complete remission being obtained in 20.6% of these patients but of no remission in the remaining 79.4%. Mean survival was 2 months for AL, 5 months for IS and 6 months for MS. Close collaboration between haematologists and clinicians and creation of a specialized clinical haematology department will be necessary to overcome current difficulties in the treatment of these affections.

Adult↗

Quantification of T cells reactive to Pf155/RESA peptides in Plasmodium falciparum-exposed individuals.

This study was designed to estimate, among T lymphocytes circulating in the peripheral blood of donors exposed to malaria parasites, the frequencies of those responding to Plasmodium falciparum antigens, and more specifically to Pf155/RESA peptides. The values of peptide-reactive T-cell frequencies were dispersed and rather low, ranging from 1:24,000 to undetectable (superior to 1:300,000). Subjects presented with different past exposure to parasites: either they had been repetitively exposed to malaria parasite infestation or they were recovering from a recent treated malaria attack. However, they had similar frequencies of T cells reactive to Pf155/RESA peptides. With cells from a minority of patients, "saw-tooth curves" were obtained, suggesting the existence of suppressor mechanisms operating in vitro in our limiting dilution assay.

Adult↗

[Antithrombin ii in eclampsia: estimation of predictive value].

We have observed in our study that antithrombin III activity decreases very significatively in eclampsia (p < 0.0001). A level of 90% was defined as a threshold. All the rates which are under or equal to 90% have 78.3% as a positive predictive value and those over 90% have a 98.7% as a negative predictive value for the overcoming of eclampsia. We have concluded that the 90% antithrombin III activity represents the alarm level for over coming eclamptic crises. The determination of the antithrombin III activity must be systematically done in every hypertensive pregnancy with proteinuria.

Adult↗

[In vitro effects of Fagaro xanthoxyloïdes Lam. on drepanocytic erythrocytes].

Study of the effect of acquious extract of Fagara xanthoxyloids Lam on the red blood corpuscles of 17 drepanocytics (SS) and 3 carriers of the trait (AS) showed drepanocyte reversibility with a residual level of 7%, an increase in the haemoglobin jellification time to 25 mn. 15 sec. (as compared to 9 mn. 57 sec.) and a shortening of red corpuscle filtration time from the normal 24.65 sec. to 9.6 sec. In a way as yet not understood, Fagara, like pentoxiphyllin, improves the rheological properties of drepanocytary blood.

Adolescent↗

[Antithrombin III in the Senegalese diabetic].

The chronometric method was applied to 141 diabetics and 151 reference subjects from both sexes aged between 19 and 60 years, all of Black race and Senegalese nationality, to study the effects of Antithrombin III (AT III). A significant reduction in the physiological activity of antithrombin III (AT III) was observed for ages 36-45 and 56-60 and correlated with obesity and other complications. With our patients, insulin dependence does not seem provoke any reduction in antithrombin III's effectiveness.

Adult↗

RH polymorphism in the Senegalese population.

RH polymorphism was evaluated in Senegalese ethnic groups: Ouolof, Serere, Toucouleur, Peul, Diola and Mande. The cDe frequency was high, the cde frequency varied between groups and the cDE frequency was twice as high as the CDe frequency. No significant heterogeneity could be assessed between tribes. Nevertheless, cluster analysis disclosed the same pattern in Diola, Toucouleur and Ouolof, while the Peul were intermediary between these and the Serere and the Mande.

Ethnicity↗

[CD4+ and CD8+ lymphocyte subpopulations in bone marrow deficiency anemias].

The study of CD4-CD8 lymphocytary sub-populations in 13 anaemic patients led the authors to note an increase in the CD8+ population in 61.5% of the cases, which resulted in the inversion of their CD4/CD8 ratio. This increase in the CD8 sub-population is connected with marrow-deficient anaemia, which leads them to suggest that marrow-deficient anaemia could well be classified according to the lymphocytary sub-populations.

Anemia↗