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Fetal Mouse Cardiovascular Imaging Using a High-frequency Ultrasound (30/45MHZ) System

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Fetal hydrops and other variables associated with the fetal hematocrit decrease after the first intrauterine

Gustavo Lobato¹, Cristina Silveira Soncini

¹Fetal Medicine Unit, Department of Obstetrics, Fernandes Figueira Institute, Oswaldo Cruz Foundation, Rio de Janeiro, Brazil. lobato@iff.fiocruz.br

Fetal Diagnosis and Therapy

|October 14, 2008

Summary

Fetal hydrops and initial hematocrit levels significantly impact the rate of red blood cell decrease after intrauterine transfusions in alloimmunized pregnancies. These factors aid in scheduling subsequent transfusions.

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A Mouse Model of in Utero Transplantation

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Published on: January 27, 2011

Area of Science:

Perinatal Medicine
Maternal-Fetal Medicine
Hematology

Background:

Alloimmunized pregnancies pose risks to fetuses due to red blood cell incompatibility.
Intrauterine transfusion (IUT) is a critical intervention for managing fetal anemia.
Understanding factors influencing post-transfusion hematocrit levels is vital for optimizing treatment protocols.

Purpose of the Study:

To investigate the impact of fetal hydrops and other clinical variables on the rate of fetal hematocrit (Hct) decrease following the initial intrauterine transfusion (IUT) in alloimmunized pregnancies.

Main Methods:

A retrospective analysis of alloimmunized pregnancies undergoing IUT between 1996 and 2006.
Exclusion of cases with specific complications or insufficient data.
Linear regression models were used to analyze the relationship between Hct fall rate and variables like fetal hydrops, antibody titer, gestational age, and pre/post-transfusion Hct.

Main Results:

Fifty fetuses met the inclusion criteria.
The average rate of fetal Hct decrease was 1.21%/day after the first IUT.
Fetal hydrops, pre-transfusion Hct, and post-transfusion Hct were independently associated with the rate of Hct drop.

Conclusions:

Fetal hydrops and initial hematocrit values are significant predictors of the rate of Hct decrease between transfusions.
These findings can assist clinicians in predicting Hct drop and scheduling subsequent IUTs more effectively.