Autologous Blood Donation and Transfusion in Patients with Placental Malposition: A Single-Institution Pilot Study and Systematic Literature Review.

Background: Autologous blood donation for placental malposition is common in Japan, but no studies have scientifically evaluated its usefulness. The purpose of this study was to evaluate the necessity for autologous blood donation for placental malposition.

Methods: A retrospective study was conducted of patients who underwent autologous blood donation for placental malposition at Kindai University Hospital from 2012 to 2022. The primary outcome was the proportion of patients who were able to avoid allogeneic blood transfusion by autologous blood transfusion; secondary outcomes were autologous blood disposal rate, allogeneic blood transfusion rate, and complications of autologous blood donation and allogeneic blood transfusion. A systematic review of studies on autologous blood transfusion for placental malposition was conducted on PubMed.

Results: Fifty-two patients (total placenta previa 16; marginal placenta previa 20; low-lying placenta 16) were included. Eight (15%) had complications at the time of autologous blood donation, including non-reassuring fetal heart rate, but no sequelae. Allogeneic blood transfusion was avoided by autologous blood transfusion in only five cases (9.6%). Autologous blood was discarded in nine cases (17%), seven of which had a low-lying placenta positioned normally at delivery. Allogeneic blood transfusion was performed in eight cases (15%) with no complications. In the systematic review, seven articles that met the inclusion criteria were selected for further evaluation. The results showed that there were no publications that scientifically demonstrated the benefit of autologous blood transfusion.

Conclusions: The results of this study indicate that autologous blood donation for placental malposition has little benefit.