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https://www.readbyqxmd.com/read/29757138/prenatal-non-invasive-foetal-rhd-genotyping-diagnostic-accuracy-of-a-test-as-a-guide-for-appropriate-administration-of-antenatal-anti-d-immunoprophylaxis
#1
Silvia Manfroi, Chiara Calisesi, Pietro Fagiani, Annalisa Gabriele, Gianluca Lodi, Simonetta Nucci, Susanna Pelliconi, Laura Righini, Vanda Randi
BACKGROUND: Foetal RHD genotyping can be predicted by real-time polymerase chain reaction (qPCR) using cell-free foetal DNA extracted from maternal plasma. The object of this study was to determine the diagnostic accuracy and feasibility of non-invasive RHD foetal genotyping, using a commercial multiple-exon assay, as a guide to appropriate administration of targeted antenatal immunoprophylaxis. MATERIAL AND METHODS: Cell-free foetal DNA was extracted from plasma of RhD-negative women between 11-30 weeks of pregnancy...
April 9, 2018: Blood Transfusion, Trasfusione del Sangue
https://www.readbyqxmd.com/read/29744883/evaluation-of-the-functional-properties-of-cryopreserved-buffy-coat-derived-monocytes-for-monocyte-monolayer-assay
#2
Betty J Kipkeu, Melissa L Shyian, Luciana da Silveira Cavalcante, Trang T Duong, Rae S M Yeung, Beth Binnington, Donald R Branch, Jason P Acker, Jelena L Holovati
BACKGROUND: Monocyte monolayer assay (MMA) is a compatibility testing method for evaluating the clinical significance of red blood cell (RBC) alloantibodies. Time-consuming monocyte isolation procedures and requirement for fresh monocytes have limited application of the MMA. The aim of this study was to develop and assess the utility and efficacy of cryopreserved buffy coat (BC)-derived monocytes for MMA application. STUDY DESIGN AND METHODS: Peripheral blood mononuclear cells (PBMNCs) were isolated from BC or peripheral blood (PB) and pooled and BC PBMNCs were cryopreserved...
May 9, 2018: Transfusion
https://www.readbyqxmd.com/read/29726855/purl-a-new-protocol-for-rhd-negative-pregnant-women
#3
Corey Lyon, Aimee English
Can cell-free DNA testing reduce unnecessary use of anti-D immunoglobulin in RhD-negative women and still prevent harm to their RhD-positive infants?
May 2018: Journal of Family Practice
https://www.readbyqxmd.com/read/29700947/fetal-rhd-genotyping-is-a-cost-effective-option-for-supporting-targeted-anti-d-prophylaxis-in-d-negative-pregnancies
#4
Shubha Allard, Edwin Massey
The prevalence of D negativity varies considerably between different ethnic groups and this in turn influences the risk of a D negative mother carrying a D positive baby. In England it has been estimated that nearly 40% of D negative women will be carrying a D negative fetus and accordingly do not require anti D prophylaxis. The availability of high-throughput non-invasive prenatal testing (HT NIPT) for the fetal RHD genotype allows such women to avoid unnecessary treatment with anti-D immunoglobulin and in 2016...
April 26, 2018: BJOG: An International Journal of Obstetrics and Gynaecology
https://www.readbyqxmd.com/read/29680907/nlrp3-inflammasome-activation-regulates-aged-rbc-clearance
#5
Li Qin, Zhao Fengyong, Zhang Jiamin, Yang Qixiu, Lu Geming, Xia Rongwei, Zhu Ziyan
The NLR family pyrin domain-containing protein 3 (NLRP3) inflammasome is triggered by various stimuli. Whether the NLRP3 inflammasome is activated during the monocyte clearing of aged or damaged erythrocytes is unknown. This work aimed to determine whether the NLRP3 inflammasome is activated during the THP-1 cell engulfing of aged erythrocytes. In the study, THP-1 cells were treated with PMA and then coincubated with untreated red blood cells (RBCs), 42 °C-treated RBCs, immunoglobulin G (IgG) anti-D-sensitized RBCs, Rhnull/Rhmod RBC sample, hemoglobin, and RBC ghost...
April 21, 2018: Inflammation
https://www.readbyqxmd.com/read/29666679/intrauterine-fetal-blood-transfusion-descriptive-study-of-the-first-four-years-experience-in-oman
#6
Arwa Z Al-Riyami, Mouza Al-Salmani, Sabria N Al-Hashami, Sabah Al-Mahrooqi, Ali Al-Marhoobi, Sumaiya Al-Hinai, Saif Al-Hosni, Sathiya M Panchatcharam, Zainab A Al-Arimi
Objectives: Haemolytic disease of the fetus and newborn (HDFN) causes hydrops fetalis . The successful treatment of HDFN has been reported with intrauterine blood transfusion (IUT). This study aimed to describe the initial experience with IUT procedures in Oman. Methods: This retrospective observational study took place at the Royal Hospital and Sultan Qaboos University Hospital Blood Bank, Muscat, Oman, and included all women who underwent IUT procedures in Oman between March 2012 and March 2016...
February 2018: Sultan Qaboos University Medical Journal
https://www.readbyqxmd.com/read/29664112/efficacy-of-d-red-blood-cell-transfusion-and-rituximab-therapy-in-autoimmune-hemolytic-anemia-with-anti-d-and-panreactive-autoantibodies-arising-after-hematopoietic-stem-cell-transplant
#7
Keiji Minakawa, Hitoshi Ohto, Hiroyasu Yasuda, Shunichi Saito, Kinuyo Kawabata, Kazuei Ogawa, Kenneth E Nollet, Kazuhiko Ikeda
BACKGROUND: Autoimmune hemolytic anemia (AIHA) is caused by autoantibodies to red blood cells (RBCs), which can be panreactive and/or specific to Rh/other blood group antigens. We report a severe case of AIHA after bone marrow transplantation (BMT) due to autoanti-D triggered by reactivation of Epstein-Barr virus (EBV) infection. A combined strategy of D- RBC transfusion and administration of anti-CD20 monoclonal antibody (MoAb) resolved the hemolysis. CASE REPORT: A 33-year-old male underwent allogeneic BMT from an ABO-identical and HLA-matched unrelated male donor...
April 17, 2018: Transfusion
https://www.readbyqxmd.com/read/29656685/maternal-hepatitis-c-hcv-infection-and-anti-d-immunoglobulin-therapy-study-testing-antibodies-rna-and-genotype-of-hcv-in-baghdad
#8
Waqar Al-Kubaisy, Suzanna Daud, Mustafa Waseem Al-Kubaisi, Omar Waseem Al-Kubaisi, Nik Nairan Abdullah
INTRODUCTION: Hepatitis C virus (HCV) infection is a serious health problem. It is a major contributor to end-stage liver disease. Worldwide, 1-8% of all pregnant women were infected. Women with viral hepatitis may be at an increased risk of pregnancy complications. There are several obstetrics intervention act as risk factors which are specific to women pertaining the HCV infection; anti-D immunoglobulin (Ig) therapy may be one of them. Our objectives were to estimate the prevalence of HCV antibodies (anti-HCV), RNA, and genotype distribution among women with anti-D Ig therapy...
April 15, 2018: Journal of Maternal-fetal & Neonatal Medicine
https://www.readbyqxmd.com/read/29624682/abo-incompatibility-and-rhig-immunoprophylaxis-protect-against-non-d-alloimmunization-by-pregnancy
#9
Carolien Zwiers, Joke M Koelewijn, Lisa Vermij, Joost van Sambeeck, Dick Oepkes, Masja de Haas, C Ellen van der Schoot
BACKGROUND: Hemolytic disease of the fetus and newborn (HDFN) is caused by maternal antibodies against fetal red blood cell antigens, most often anti-D, -K, or -c. ABO incompatibility between mother and child and anti-D immunoprophylaxis (RhIG) are known to reduce the risk of D immunization and subsequent HDFN. However, no immunoprophylaxis has been developed to prevent non-D immunizations. STUDY DESIGN AND METHODS: We evaluated whether ABO incompatibility has a preventive effect on formation of non-D alloantibodies, by performing a case-control study including pregnant women with newly detected non-D antibodies, identified within a nationwide data set, immunized during their first pregnancy and/or delivery...
April 6, 2018: Transfusion
https://www.readbyqxmd.com/read/29616835/lessons-learned-from-the-implementation-of-non-invasive-fetal-rhd-screening
#10
Frederik Banch Clausen
In the fight against hemolytic disease of the fetus and newborn, pregnant RhD negative women are offered antenatal and postnatal anti-D immunoglobulin prophylaxis to prevent the development of antibodies against the fetal D antigen. Antenatal prophylaxis has traditionally been provided to all D negative pregnant women, as the fetal RhD type remains unknown until birth. With noninvasive prenatal testing of cell-free DNA, predicting the fetal RhD type has become highly feasible based on analysis of the fetal RHD gene...
April 19, 2018: Expert Review of Molecular Diagnostics
https://www.readbyqxmd.com/read/29582441/d-immunized-blood-donors-who-are-female-and-who-possess-at-least-one-hla-drb1-15-allele-show-a-propensity-for-high-serum-rhig-production
#11
Joanne C G Tan, Fang Fang Yuan, Jackie Daley, Katherine Marks, Robert L Flower, Wayne B Dyer
BACKGROUND: D- individuals with previous D-incompatible pregnancies and/or blood transfusions, as well as those who are actively immunized with small-volume D+ red blood cells (RBCs), are stimulated to produce RhIG. Many factors could influence the stimulation of immunoglobulin production in response to foreign antigen (such as antigen immunogenicity and genetic factors), and it is unknown whether genetic markers could potentially identify responder anti-D donors. STUDY DESIGN AND METHODS: Anti-D donors were assigned a responder profile based on their serum RhIG levels (n = 431)...
March 26, 2018: Transfusion
https://www.readbyqxmd.com/read/29580376/high-throughput-non-invasive-prenatal-testing-for-fetal-rhesus-d-status-in-rhd-negative-women-not-known-to-be-sensitised-to-the-rhd-antigen-a-systematic-review-and-economic-evaluation
#12
Pedro Saramago, Huiqin Yang, Alexis Llewellyn, Ruth Walker, Melissa Harden, Stephen Palmer, Susan Griffin, Mark Simmonds
BACKGROUND: High-throughput non-invasive prenatal testing (NIPT) for fetal rhesus (D antigen) (RhD) status could avoid unnecessary treatment with routine anti-D immunoglobulin for RhD-negative women carrying a RhD-negative fetus, although this may lead to an increased risk of RhD sensitisations. OBJECTIVES: To systematically review the evidence on the diagnostic accuracy, clinical effectiveness and implementation of high-throughput NIPT and to develop a cost-effectiveness model...
March 2018: Health Technology Assessment: HTA
https://www.readbyqxmd.com/read/29563670/prevalence-of-irregular-red-cell-antibody-in-healthy-blood-donors-attending-a-tertiary-care-hospital-in-north-india
#13
Raj Nath Makroo, Saroj Rajput, Soma Agarwal, Mohit Chowdhry, Bindu Prakash, Prashant Karna
BACKGROUND: Alloantibodies may be detected in blood donors who have either been transfused previously or female donors with previous obstetric events. These antibodies can occasionally cause severe transfusion reaction, if a large amount of plasma or whole blood is transfused, as in massive transfusions and pediatric patients. AIMS: The present study aims to assess the prevalence of red cell antibodies in healthy blood donors at a tertiary care hospital-based blood bank in India...
January 2018: Asian Journal of Transfusion Science
https://www.readbyqxmd.com/read/29560141/maternal-fetal-rhesus-rh-factor-incompatibility-in-arar-northern-saudi-arabia
#14
Raghad Mubarak Aljuhaysh, Nagah Mohamed Abo El-Fetoh, Malak Ibrahim Alanazi, Afaf Shuaib Albaqawi, Wafa Mohammed Alanazi, Najah Salah Alanazi, Reham Muqbil Alanazi, Atheer Mutab Alanazi, Eiman Mohammad Alnemer, Rahma Abdulhadi Alenezi, Tasleem Khoudier Alabdullatif, Rehab Abdallah Alanazi, Samiyah Sarhan Alanazi, Kawthar Saeed Alsultan, Ibtisam Matan Alanazi, Duaa Sami Alsunayni
Background and aim: Rh isoimmunization still contributes to the neonatal morbidity and mortality due to non-immunization, under-immunization, and in rare cases, false Rh typing. The main objective of this study was to determine the prevalence of Rh incompatibility, mothers' knowledge about Rh incompatibility, mothers' knowledge about anti-D immunoglobulin and to show the pregnancy outcome of Rh negative mothers. Methods: A cross-sectional study was carried out at the Maternity and Children Hospital in Arar city from November 2016 to May 2017...
December 2017: Electronic Physician
https://www.readbyqxmd.com/read/29553439/red-blood-cell-alloantibodies-in-multiply-transfused-patients-in-the-occupied-palestinian-territory-a-pilot-study
#15
Ahmad Yaseen, Sa'd Suleiman, Omar Abu Zenah, Adham Abu Taha
BACKGROUND: Red blood-cell transfusion has greatly reduced the mortality and morbidity in multiply transfused patients with thalassaemia and sickle cell disease. However, this can result in red blood-cell isoimmunisation with autoantibodies and alloantibodies, which can lead to serious complications such as delayed haemolytic transfusion reaction. The aim of this study was to assess the frequency and types of alloantibodies in multiply transfused patients living in the north of the West Bank...
February 21, 2018: Lancet
https://www.readbyqxmd.com/read/29532485/facilitators-and-barriers-for-rhd-immunized-women-to-become-and-remain-anti-d-donors
#16
Yolentha Maria Slootweg, Johanna Maria Koelewijn, Wim L de Kort, Masja de Haas, Eva-Maria Merz
BACKGROUND: The successful introduction of prophylaxis with anti-RhD immunoglobulin has resulted in a significant decline of pregnancy-related RhD immunizations but also has decreased the availability of naturally immunized women as (new) anti-D donors. An influx of new donors is necessary to maintain a sufficient pool of anti-D donors. We investigated motivators, barriers, and predictors for anti-D donorship in RhD-immunized women. STUDY DESIGN AND METHODS: A mixed-methods design was applied, including focus group discussions and questionnaires...
March 12, 2018: Transfusion
https://www.readbyqxmd.com/read/29517966/screening-and-identification-of-rhd-antigen-mimic-epitopes-from-a-phage-display-random-peptide-library-for-the-serodiagnosis-of-haemolytic-disease-of-the-foetus-and-newborn
#17
Jiao Wang, Jingjing Song, Shuimei Zhou, Yourong Fu, Jeffrey A Bailey, Changxin Shen
BACKGROUND: Identification of RhD antigen epitopes is a key component in understanding the pathogenesis of haemolytic disease of the foetus and newborn. Research has indicated that phage display libraries are useful tools for identifying novel mimic epitopes (mimotopes) which may help to determine antigen specificity. MATERIALS AND METHODS: We selected the mimotopes of blood group RhD antigen by affinity panning a phage display library using monoclonal anti-D. After three rounds of biopanning, positive phage clones were identified by enzyme-linked immunosorbent assay (ELISA) and then sent for sequencing and peptides synthesis...
January 16, 2018: Blood Transfusion, Trasfusione del Sangue
https://www.readbyqxmd.com/read/29512164/maternal-red-blood-cell-alloimmunization-requiring-intrauterine-transfusion-a-comparative-study-on-management-and-outcome-depending-on-the-type-of-antibody
#18
Thanh-Vy Phung, Véronique Houfflin-Debarge, Nassima Ramdane, Louise Ghesquière, Anne Delsalle, Capucine Coulon, Damien Subtil, Pascal Vaast, Charles Garabedian
BACKGROUND: The antibody primarily responsible for fetal anemia may influence treatment and prognosis. The primary objective was to compare ante- and postnatal management and the outcomes of maternal red blood cell (RBC) alloimmunizations according to the antibody involved. The secondary objective was to compare anti-D alloimmunizations according to associated number of antibodies. STUDY DESIGN AND METHODS: A single-center study from 1999 to 2015 including maternal RBC alloimmunizations requiring intrauterine transfusion (IUT) was conducted...
May 2018: Transfusion
https://www.readbyqxmd.com/read/29508504/a-rhag-point-mutation-selectively-disrupts-rh-antigen-expression
#19
S Mu, Y Cui, W Wang, L Wang, H Xu, O Zhu, D Zhu
OBJECTIVES: The aim of this study was to characterise a novel mutation in the gene encoding RhAG in order to elucidate a molecular mechanism for Rh antigen expression and spherocytosis. BACKGROUND: Rhesus-associated glycoprotein (RhAG) is critical for maintaining the structure and stability of erythrocytes. Single missense mutations in the gene encoding RhAG are sufficient to induce spherocytosis and deficiencies in Rh complex formation. We report a novel missense mutation that incompletely disrupts Rh antigen expression and selectively knocks out RhD antigen expression...
March 6, 2018: Transfusion Medicine
https://www.readbyqxmd.com/read/29479934/is-the-management-of-rh-rh-incompatibility-with-noninvasive-fetal-rh-genotyping-for-targeted-prophylaxis-cost-effective-in-the-turkish-population
#20
Emine Demirel, Sefa Kelekçi, Emre Ekmekci, Mustafa Şengül, Raziye İri, Melahat Atasever
Background/aim: The aim of this study was to assess unnecessary immunization rates and compare the cost-effectiveness of targeted prophylaxis with fetal Rh genotyping with that of traditional management of Rh-Rh incompatibility in a virtual economic model. Materials and methods: This retrospective data analysis was conducted at two tertiary centers between 2011 and 2015. The data of 1135 pregnant women were analyzed. The main outcome measure was to determine the unnecessary immunization rate among the whole Rh-Rh incompatibility group...
February 23, 2018: Turkish Journal of Medical Sciences
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