The electric procedure was also associated with a significantly higher risk of intrauterine adhesions after the procedure, compared with the manual vacuum aspiration (5.2% vs. 1.2%; P less than .001).
Lilian Padrón, MD, of the Trophoblastic Disease Center at the Rio de Janeiro Federal University and coauthors commented that the vacuum pressure is about 100 mm Hg higher in the electric technique than it is in the manual technique, which may be responsible for the greater risk of synechia.
However, there were no significant differences seen between the two groups in the risk of developing postmolar gestational trophoblastic neoplasia (14.2% with electric vs. 17.3% with manual; P = .074) nor in the presence of metastatic disease (19.9% vs. 17.8%; P = .082) or the need for multiagent chemotherapy.
Around 13% of patients had incomplete uterine evacuation, but the risk was similar between electric and manual vacuum aspiration.