PubMed | Kenya Medical Research Institute, Imperial College London, Coast Provincial General Hospital and Regional Blood Transfusion Center
Type: Journal Article | Journal: The Lancet. Haematology | Year: 2015
In sub-Saharan Africa, children are frequently admitted with severe anaemia needing an urgent blood transfusion, but blood is often unavailable. When conventional blood supplies are inadequate, allogeneic umbilical cord blood could be a feasible alternative. The aim of this study was to assess the safety and efficacy of cord blood transfusion in children with severe anaemia.Between June 26, 2007, and May 20, 2008, 413 children needing an urgent blood transfusion were admitted to Kilifi District Hospital in Kenya. Of these, 87 children were eligible for our study--ie, younger than 12 years, no signs of critical illness, and haemoglobin 100 g/L or lower (if aged 3 months or younger) or 40 g/L or lower (if older than 3 months). Cord blood was donated at Coast Provincial General Hospital, Mombasa, and screened for transfusion-transmitted infections and bacterial contamination. Red blood cells were stored vertically at 2-6C to enable sedimentation. After transfusion, children were monitored closely for adverse events and followed up for 28 days. The primary outcome measure was the frequency and nature of adverse reactions associated with the transfusion. Secondary outcomes were the changes in haemoglobin concentrations 24 h and 28 days after transfusion, compared with pretransfusion levels. This trial is registered on ISRCTN.com, number ISRCTN66687527.Of the 87 children eligible for the study, cord blood was unavailable for 24, six caregivers declined consent, and two children were withdrawn before transfusion. Therefore, 55 children received umbilical cord red blood cells from 74 donations. Ten (18%) children had ten serious adverse events and 43 (78%) had 94 adverse events; the most frequent adverse events were anaemia (n=14), weight loss (n=12), and vomiting (n=10). An independent expert panel judged none of these adverse events to be probably or certainly caused by the cord blood transfusion (one-sided 975% CI 0-65). Haemoglobin increased by a median of 26 g/L (IQR 21-31) 24 h after transfusion and by 50 g/L (10-68) a median of 29 days (28-35) after transfusion.These preliminary data suggest that cord blood could be an important supplementary source of blood for transfusion in children in sub-Saharan Africa. Further studies are needed to compare the safety and efficacy of cord blood with conventional adult-donated blood for transfusions. Challenges associated with cost, infrastructure, and scale up also need investigating.Wellcome Trust.
Dahourou H.,Regional Blood Transfusion Center |
Tapko J.-B.,World Health Organisation |
Kienou K.,National Blood Transfusion Center |
Nebie K.,National Blood Transfusion Center |
Sanou M.,National Blood Transfusion Center
Biologicals | Year: 2010
Burkina Faso is a continental West African country of approximately 16 M people whose transfusion needs were covered by 66,210 blood units collected mostly in 4 regional transfusion centers part of a national network but also from hospital-based smaller blood centers. The first group of blood centers relies almost exclusively on volunteer, non-remunerated, blood donors and only approximately 32.7% of them are repeating donation. In contrast, hospital-based blood centers rely nearly exclusively on family/replacement donors. The general strategy of the national blood transfusion network was to base the system exclusively on volunteer donors, which was nearly accomplished overall and completely at Bobo-Dioulasso, the largest center. However, despite considerable increase in blood collection, the overall blood supply remains low (4.7 units/1000 inhabitants) and worsens during the secondary school recesses since young student blood constitutes the most part of volunteer donors. To overcome such shortages, mobile blood collection sessions are organized in alternate sites such as military barracks or places of worship but with limited success. Another critical issue is that despite considerable efforts and help from community advocates, only 32.7% of volunteers repeat donation limiting the considerably safety advantage of a pool of regular donors. © 2009.
Arrojo I.P.,Regional Blood Transfusion Center |
Hernandez Lamas M.D.C.,Regional Blood Transfusion Center |
Verdugo L.P.,Regional Blood Transfusion Center |
Alfaro P.R.,Regional Blood Transfusion Center |
And 4 more authors.
Blood Transfusion | Year: 2012
Background. Umbilical cord blood (UCB) is a source of hematopoietic precursor cells for transplantation. The creation of UCB banks in 1992 led to the possibility of storing units of UCB for unrelated transplants. The distribution of cell contents in historical inventories is not homogenous and many units are not, therefore, suitable for adults. The aim of this study was to analyse our UCB bank inventory, evaluate the units released for transplantation and calculate the cost of the current process per unit of UCB stored. Methods. Three study periods were defined. In the first period, from January 1996 to January 2006, the total nucleated cell (TNC) count acceptable for processing was 4-6×10 8 and a manual processing system was used. In the second period, from October 2006 to July 2010, processing was automated and the acceptable TNC count varied from 8-10×10 8. In the third period, from January 2009 to June 2010, an automated Sepax-BioArchive procedure was used and the accepted initial TNC count was >10×10 8. Within each period the units were categorised according to various ranges of cryopreserved TNC counts in the units: A, >16.2×10 8; B1, from 12.5-16.1×10 8; B2, from 5.2-12.4×10 8; and C, <5.1×10 8. Results. The third period is best representative of current practices, with homogenous TNC acceptance criteria and automated processing. In this period 15.7% of the units were category A and 25.5% were category B. Overall, the mean TNC count of units released for transplantation was 14×10 8 (range, 4.6×10 8 to 36.5×10 8). The cost of the processed UCB in 2009 was 720.41 euros per unit. Conclusion. An UCB bank should store units of high-quality, in terms of the TNC count of units issued for transplantation, have a training programme to optimise the selection of donors prior to delivery, use similar volume reduction systems and homogenous recovery indices, express its indicators in the same units, use validated analytical techniques, and bear in mind ethnic minorities. © SIMTI Servizi Srl.
Baha W.,Pasteur Institute of Morocco |
Baha W.,University Sidi Mohammed Ben Abdellah |
Foullous A.,Pasteur Institute of Morocco |
Dersi N.,Pasteur Institute of Morocco |
And 11 more authors.
BMC Public Health | Year: 2013
Background: Viral hepatitis is a serious public health problem affecting billions of people globally. Limited information is available on this issue in Morocco. This cross-sectional study was undertaken with the aim of determining the seroprevalence and risk factors of hepatitis B virus (HBV) and hepatitis C virus (HCV) among the general population and among blood donors. Methods. Blood samples from volunteers, have been screened with ELISA tests for detecting the hepatitis-B surface antigen (HBsAg) and anti-HCV. Within the seroreactive patients for HCV in the general population, RT-PCR was performed by the Cobas Ampliprep/Cobas Amplicor. Results: HCV and HBV-seropositivity was documented in 1.58% and 1.81% out of 41269 and 23578 participants respectively from the general population. Two patients were found to be co-infected. HCV-RNA was detected by PCR in 70.9% of the 195 anti-HCV positive subjects. The anti-HCV prevalence was not different among males and females (P = 0.3). It increased with age; the highest prevalence was observed among subjects with >50 years old (3.12%). Various risk factors for acquiring HCV infection were identified; age, dental treatment, use of glass syringes and surgical history. In addition to these factors, gender and sexual risk behaviors were found to be associated with higher prevalence of hepatitis B. The HBV positivity was significantly higher among males than females participants in all age groups (P < 0.01). The peak was noticed among males aged 30-49 years (2.4%). None of the 152 persons younger than 20 years had HBsAg or anti-HCV. The prevalence of anti-HCV and HBsAg among 169605 blood donors was 0.62% and 0.96% respectively. Conclusions: Our study provided much important information concerning hepatitis B and C prevalence and risk factors; it confirmed the intermediate endemicity for HCV infection and pointed to a decreasing trend of HBV incidence, which might reclassify Morocco in low HBV endemicity area. This could be attributed primarily to the universal HBV vaccination among infants and healthcare workers over the past 13 years. HCV and HBV infections in the present survey were mainly associated with nosocomial exposures. Prevention and control of HBV infection are needed to reduce HBV transmission between adults. © 2013 Baha et al.; licensee BioMed Central Ltd.
PubMed | Regional Blood Transfusion Center and Jean Monnet University
Type: | Journal: Blood transfusion = Trasfusione del sangue | Year: 2016
Leucoreduction of blood components, including platelet components, is strongly encouraged but not yet universal, especially outside high income countries. As both leucocytes and platelets secrete copious amounts of pro-inflammatory cytokines/chemokines under various conditions and during storage, we investigated the potential of the respective secretory programmes of these cells in order to evaluate their subsequent pathophysiological effects.A total of 158 individual non-leucoreduced platelet components were obtained from Tunisian donors and tested for characteristic biological response modifiers (BRM) of leukocytes (IL-1, IL-8), platelets (sCD62P, sCD40L) and both cell types (TNF-, RANTES) in the presence or absence of thrombin stimulation and after different periods of storage (up to 5 days). BRM levels were determined using enzyme-linked immunosorbent assays and Luminex technology. Platelet-leucocyte aggregate formation during storage was analysed using flow cytometry.Leucocyte- and platelet-associated BRM had clearly distinct profiles both at the onset (day 0) and termination (day 5) of the observation period but altered during the intermediate period so that their respective importance was inverted; in fact, the profiles were merged and indistinguishable on days 2-3. The leucocyte-derived BRM largely dominated over platelet-derived ones and further altered the BRM platelet secretion programme.This study contributes substantial, new information on leucocyte/platelet interactions and their likely role in transfusion when leucodepletion cannot be performed or is only partially achieved.
PubMed | Aix - Marseille University and Regional Blood Transfusion Center
Type: Journal Article | Journal: Blood transfusion = Trasfusione del sangue | Year: 2015
The choice of a molecular test for first intention determination of paternal RHD zygosity, before entering into invasive diagnostics, is important for the management of pregnancies at risk of haemolytic disease of the foetus and newborn related to anti-RhD.RHD zygosity was evaluated in 370 RH:1 Tunisian donors by polymerase chain reaction - sequence-specific polymorphism (PCR-SSP) analysis and polymerase chain reaction - restriction fragment length polymorphism (PCR-RFLP) amplification of hybrid Rhesus box and by real time quantitative polymerase chain reaction (RQ-PCR) specific for RHD exon 5. To evaluate the accuracy of molecular tests in the cases of discordant results, the ten exons of RHD and Rhesus boxes were amplified by PCR and sequenced.Molecular investigations revealed that our 370 donors comprise 193 dizygous and 145 hemizygous individuals and 32 subjects whose zygosity remains unknown. Positive predictive values were higher than 99% for all the methods, reaching 100% for RQ-PCR. Negative predictive values were 83.24%, 87.27% and 98% for PCR-SSP, PCR-RFLP and RQ-PCR respectively. This study also revealed 19 novel Rhesus box polymorphisms and three novel RHD alleles: RHD(Trp185Stop), RHD(Ala176Thr) and RHD(Ile342Ile).RQ-PCR is the most convenient method for first intention determination of paternal RHD zygosity in Tunisians. However, taking into account positive and negative predictive values, PCR-RFLP could be an alternative despite the heterogeneity of Rhesus boxes and the complexity of RHD.
PubMed | Burdwan Medical College and Regional Blood Transfusion Center
Type: Journal Article | Journal: Journal of family medicine and primary care | Year: 2014
The birth of transfusion-dependent states of hemoglobinopathies including thalassemias is preventable by population screening and genetic counseling. Magnitude is not addressed in the Northern Region of West Bengal where many ethnic variants inhabit.The aim of the following study is to find out the burden of different entities of hemoglobinopathies, their correlation with ethnicity and the at risk groups.A descriptive study was conducted from the Hematology Unit of North Bengal Medical College over 1 year on the subjects underwent screening for hemoglobinopathies for detection of abnormal hemoglobin (Hb) variants by cation-exchange high-performance liquid chromatography principle along with other relevant tests.Data was analyzed by frequency distribution and Chi-square test assuming P value as 95% of the level of significance using the SPSS version 16 (SPSS Inc., Chicago, Illinois, U.S.A).Abnormal Hb variant was 47.5% among 1872. Hb E trait (34.4%) was most common followed by Hb E disease (25.3%) and others. Hb E disorders (92.7%) were observed mostly among Rajbangsi population while E--thalassemias (40%) in the Muslims and a heterogeneous pattern noted among tribal and mongoloid.Hb E hemoglobinopathies was high among Rajbangsi and Muslims with identification of some other hemoglobinopathies involving tribal and mongoloid.
PubMed | University Hospital Center 1, Regional blood transfusion Center, Laboratory of Biochemistry and Molecular Biology, University Ibn Zohr and Pasteur Institute of Morocco
Type: Journal Article | Journal: Annales d'endocrinologie | Year: 2016
The present study aims at determining the relationship between the plasma fibrinogen concentration and the severity of coronary heart disease in type 2 diabetic patients.Prospective analytical survey, based on a sample of 120 subjects divided in four groups: 30 non diabetic coronary patients (G1), 30 coronary diabetic patients (G2), 30 non-coronary diabetic patients (G3), and 30 healthy subjects (G4).The average age was 59.587.88 years; female gender predominated by 52.5%. The plasma fibrinogen concentration corresponded to 3.46g/L0.86 in G1; 3.73g/L1.11 in G2; 3.06g/L0.98 in G3 and 2.46g/L0.51 in G4; with a significant difference between the four groups (P=0.001). The plasma fibrinogen concentration increased in parallel with the cardiovascular risk (P=0.0001); there was also a significant correlation between the plasma fibrinogen concentration and the clinical and para-clinical coronary disease severity (respectively P=0.005 and P=0.0001). A positive correlation between the plasma fibrinogen concentration and hyperglycemia (P=0.035) was found in G4. But no correlation with the lipids parameters, except for the low density-lipoproteins in G3 (P=0.035).In the Moroccan population, the plasma fibrinogen concentration was positively and significantly correlated with the coronary heart disease severity.
PubMed | Regional Blood Transfusion Center and National Blood Transfusion Center
Type: Journal Article | Journal: Blood transfusion = Trasfusione del sangue | Year: 2015
More than 90 weak D types have been discovered to date. As there are no published data on the frequencies of weak D types in the Tunisian population, the aim of this study was to determine the composition of weak D alleles in our population.Blood samples from 1777 D+ and 223 D- blood donors were tested for markers 809G, 1154C, 8G, 602G, 667G, 446A, and 885T relative to translation start codon by polymerase chain reaction with sequence-specific primers to estimate the frequencies of weak D type 1, weak D type 2, weak D type 3, weak D type 4, weak D type 5 and weak D type 11 in our population. Twenty-three samples with positive reactions were re-evaluated by DNA sequencing of RHD exons 1-10 and adjacent intronic sequences.Among the D+ donor cohort, weak D type 4 was the most prevalent allele (n=33, 1.2%) followed by weak D type 2 (n=6, 0.17%), weak D type 1 (n=4, 0.11%), and weak D type 5 (n=1, 0.28%) and weak D type 11 (n=1, 0.28%). RHD sequencing identified a weak D type 4.0 allele in all 19 samples tested. Among the D- pool, comprising 223 samples, we detected one sample with weak D type 4.0 associated with a C+c+E-e+ phenotype which had been missed by routine serological methods.Weak D type 4.0 appears to be the most prevalent weak D in our population. However, all samples must be sequenced in order to determine the exact subtype of weak D type 4, since weak D type 4.2 has considerable clinical importance, being associated with anti-D alloimmunisation. One case of weak D type 4 associated with dCe in trans had been missed by serology, so quality control of serological tests should be developed in our country.
PubMed | Red Cross, Regional Blood Transfusion Center, Institute of Hematology and Transfusion Medicine and KH Elisabethinen
Type: Case Reports | Journal: Transfusion | Year: 2016
The Rhesus (Rh) complex consists of a core comprising the Rh proteins (RhD/RhCE) and the Rh-associated glycoprotein (RhAG) with accessory chains (GPB, LW, CD47). Molecular defects of the RHAG gene may cause a regulator Rhnull phenotype without Rh antigen expression or a Rhmod phenotype with decreased Rh antigen expression.Blood samples of a donor with strongly diminished Rh antigens and five family members were analyzed by serological phenotyping, flow cytometry, molecular testing, and gene expression analysis of Rh complex candidate genes.RHAG sequencing identified a missense mutation, c.241G>C (p.Gly81Arg) and a splice site mutation, c.640 + 3del14, among the cohort. Compound heterozygosity of these novel alleles identified in the propositus and two siblings gave rise to a strongly diminished expression of RhAG, Rh, and CD47 antigens on the RBC surface.The Rhmod phenotype was caused by a novel RHAG splice site mutation in association with a non-functional allele. The primary depression of RhAG is most likely due to posttranslational events that affect the interaction and processing of the RhAG glycoprotein and gave rise to a secondary depression of RhD, RhCE, and CD47, the major members of the Rh complex.