Outcome of Pregnancies with First Trimester Threatened Abortion : A Prospective Study

Abstract

Objective : To evaluate the outcome of pregnancies complicated with first trimester threatened abortion.

Study design : Prospective study of 224 singleton pregnancies complicated with first trimester threatened abortion undergoing transvaginal sonographic examination and follow up until delivery.

Results : The outcome was classified into two groups : firstly, 135 (60.3%) nonviable pregnancies including cases of blighted ovum 52 (23.2%), embryonic or fetal demise 31 (13.8%), complete abortion 28 (12.5%), incomplete abortion 13 (5.8%), ectopic pregnancies 7 (3.1%) and molar pregnancies 4 (1.8%); secondly, 89 (39.7%) viable pregnancies. Of the viable group, 8 (9.0%) eventually aborted spontaneously, and 81 (91.0%) continued their pregnancies beyond 20 weeks, in which 69 (85.2%) delivered at term and 12 (14.8%) ended in preterm births. The obstetric complications were comparable.

Conclusion : The majority of pregnan cies with first trimester threatened abortion were nonviable and transvaginal sonography was useful in clinical management. (Thai J Obstet Gynaecol 1995; 7:1-7.)