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Alloimmunization by hr'(c), hemolytic disease of newborns, and perinatal management
Insights
Hemolytic disease of the newborn due to anti-c alloimmunization affects many infants, with up to 40% requiring transfusions. Early detection via maternal antibody titers and amniotic fluid analysis aids in managing this condition.
Area of Science:
- Obstetrics and Gynecology
- Immunology
- Neonatology
Background:
- Anti-c alloimmunization is a significant concern in pregnancy, occurring almost as frequently as anti-D (Rh0).
- Hemolytic disease of the newborn (HDN) can arise from maternal anti-c antibodies, impacting fetal health.
Purpose of the Study:
- To investigate the natural history of hr'(c) hemolytic disease.
- To establish management criteria for anti-c alloimmunization during pregnancy.
Main Methods:
- Analysis of serologic evidence in infants born to c-alloimmunized women.
- Correlation of maternal antiglobulin titers with disease severity.
- Evaluation of factors like ABO incompatibility and maternal transfusion history.
Main Results:
- 74% of infants from c-alloimmunized mothers and c-positive fathers show serologic evidence of HDN.
- Up to 40% of affected infants necessitate transfusions.
- Maternal antiglobulin titers < 1:16 generally indicate mild or no disease.
Conclusions:
- Anti-c alloimmunization presents a notable risk for hemolytic disease of the newborn.
- Maternal antibody titers and fetal antigen status guide management decisions.
- Amniotic fluid pigment analysis is recommended for high-risk pregnancies.
Abstract:
A study was made of hr'(c) hemolytic disease to determine its natural history and to develop criteria for its management. Anti-c is 0.52 as frequent as anti-D(Rho) in gravid women. Seventy-four percent of infants born of c-alloimmunized women mated to c-positive men show serologic evidence of hemolytic disease of newborns. Up to 40% of affected infants require transfusion. There is evidence that ABO incompatibility between mother and fetus protects against alloimmunization. Although alloimmunization is frequently related to fetomaternal bleeding, severe hemolytic disease appears to be associated with previous maternal transfusion. Maternal antiglobulin titers of less than 1:16 are usually associated with mild disease or none at all. Women with higher titers, whose mates are hr'(c)-antigen positive, are candidates for amniotic fluid pigment analysis.