TY - JOUR
T1 - ABO incompatibility and RhIG immunoprophylaxis protect against non-D alloimmunization by pregnancy
AU - Zwiers, Carolien
AU - Koelewijn, Joke M.
AU - Vermij, Lisa
AU - van Sambeeck, Joost
AU - Oepkes, Dick
AU - de Haas, Masja
AU - van der Schoot, C. Ellen
PY - 2018
Y1 - 2018
N2 - 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. Subsequently, we assessed a possible protective effect of RhIG in a subgroup with non-Rh antibodies only. The proportions of previous ABO incompatibility and of RhIG administrations of these women were compared to the known rate of 19.4% ABO incompatibility and 9.9% RhIG administrations (D– women carrying a D+ child) in the general population of pregnant women. RESULTS: A total of 11.9% of the 232 included immunized women had a possible ABO incompatibility in their first pregnancy (vs. expected 19.4%; 95% confidence interval [CI], 7.3-18.8; p = 0.036). Furthermore, 1.0% women with non-Rh antibodies were D–, delivered a D+ child, and had therefore received RhIG, whereas 9.9% was expected (95% CI, 0.18-5.50; p = 0.003). CONCLUSION: We found that ABO incompatibility and RhIG reduce the risks not only for D, but also for non-Rh immunizations, suggesting that antibody-mediated immune suppression in this condition is not antigen specific.
AB - 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. Subsequently, we assessed a possible protective effect of RhIG in a subgroup with non-Rh antibodies only. The proportions of previous ABO incompatibility and of RhIG administrations of these women were compared to the known rate of 19.4% ABO incompatibility and 9.9% RhIG administrations (D– women carrying a D+ child) in the general population of pregnant women. RESULTS: A total of 11.9% of the 232 included immunized women had a possible ABO incompatibility in their first pregnancy (vs. expected 19.4%; 95% confidence interval [CI], 7.3-18.8; p = 0.036). Furthermore, 1.0% women with non-Rh antibodies were D–, delivered a D+ child, and had therefore received RhIG, whereas 9.9% was expected (95% CI, 0.18-5.50; p = 0.003). CONCLUSION: We found that ABO incompatibility and RhIG reduce the risks not only for D, but also for non-Rh immunizations, suggesting that antibody-mediated immune suppression in this condition is not antigen specific.
UR - https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85044978527&origin=inward
UR - https://www.ncbi.nlm.nih.gov/pubmed/29624682
U2 - https://doi.org/10.1111/trf.14606
DO - https://doi.org/10.1111/trf.14606
M3 - Article
C2 - 29624682
SN - 0041-1132
VL - 58
SP - 1611
EP - 1617
JO - Transfusion
JF - Transfusion
IS - 7
ER -