Survival analysis of transfused fetuses affected by Rh-alloimmunization

Area of Science:

• Perinatal Medicine
• Maternal-Fetal Medicine
• Hematology

Background:

• Rh-alloimmunization poses a significant risk to fetal well-being, potentially leading to hydrops fetalis and intrauterine fetal demise.
• Intrauterine transfusions are a critical intervention for managing severe fetal anemia caused by Rh-alloimmunization.

Purpose of the Study:

• To evaluate the survival rate of fetuses undergoing intrauterine red blood cell transfusion for Rh-alloimmunization.
• To identify key predictors of survival in this high-risk fetal population.

Main Methods:

• Retrospective analysis of 86 fetuses with Rh-alloimmunization receiving intrauterine transfusions.
• Stratification of survival data based on pre-transfusion fetal hemoglobin, hemoglobin change (delta hemoglobin), and ultrasound-detected anomalies, including hydrops fetalis.
• Application of Cox regression analysis to determine significant predictors of fetal survival.

Main Results:

• Overall crude fetal survival rate was 89.5%.
• Survival rates were significantly stratified by pre-transfusion fetal hemoglobin levels (<70% vs. >=70% expected value) and delta hemoglobin (<=6 g/dL vs. >6 g/dL).
• Presence of hydrops fetalis was strongly associated with reduced survival (97.83% without hydrops vs. 80.0% with hydrops; p=0.0058).
• Cox regression identified hydrops fetalis (OR=8.7) and delta hemoglobin (OR=2.0) as significant predictors of survival.

Conclusions:

• Intrauterine red blood cell transfusion is an effective treatment for Rh-alloimmunization, with high survival rates.
• Fetal hydrops and hemoglobin management (delta hemoglobin) are crucial factors influencing survival outcomes.
• Hydrops fetalis is the most significant negative predictor of survival in fetuses undergoing intrauterine transfusion for Rh-alloimmunization.