BACKGROUND:

Rh isoimmunization is the main risk factor for fetal anemia. When this is moderate or severe intrauterine transfusion before 34 weeks, and the birth of the fetus after 37, are the most accepted treatment options.

CLINICAL CASE:

A 29-year-old patient, 34 weeks pregnant, with a history of three pregnancies that ended in two deliveries and a C-section and Rh isoimmunization with neurological sequelae due to hemolytic anemia. Finding of positive indirect Coombs 1/512 and VPS-ACM = 57 cm/s. Reagent cardiotocographic record and weekly ambulatory follow-up. He returned to the Emergency Department due to the perception of sporadic uterine contractions. The fetus was found with 140 bpm, weight of 2760 g and quantifications corresponding to mild anemia. The cordocentesis reported Hb = 7.7 g/dL; “O” Rh (+). The pregnancy was terminated by caesarean section with the birth of a girl of 2702 g, Apgar 9/9, neonatal hemoglobin of 7.9 and 7 g/dL, total bilirubin = 6.8 and 10.71 mg/dL (at 4 and 7 hours after birth). Exchange transfusion was performed twice due to recurrent anemia, intensive phototherapy for 5 days, and was discharged after 25 days.

CONCLUSIONS:

It is important to analyze and quantify the risks of prolonging a pregnancy beyond 34 weeks and apply intrauterine transfusion versus interrupting it and continuing the treatment extrauterine; After 35 weeks, the risks of the procedures surpass those of preterm delivery.