Patients
This nationwide retrospective study was performed with 747 patients
recruited from 13 first-class hospitals located in the different regions
of mainland China. The criteria used for patient selection was: ①
previous history of cesarean section; ② cesarean delivery for this time;
③ edged, partial or complete placenta previa; placenta previa growing on
the uterine scar of previous cesarean surgery. The women who had lower
placenta or edged placenta previa in the posterior or lateral wall, were
excluded. A hundred and six of these patients, who received uterine
artery embolization or abdominal aortic balloon occlusion, were assigned
to the blocking group. The other 641 women were considered as the
non-blocking group.