Long-term prognosis of pregnancies in women with intrauterine hematomas.

To evaluate the long-term significance of intrauterine hematomas in patients with threatened abortion, 380 women with a living fetus of more than 8 weeks were studied. On ultrasound, intrauterine hematomas, defined as an echo-poor subchorionic collection, were found in 86 women. Two hundred ninety-four patients without hematomas served as controls. The rate of miscarriage was significantly increased in the study group (22.1 versus 8.2%; P less than .05). Patients discharged from the initial hospitalization without aborting still had a higher abortion risk than controls (16.3 versus 5.6%; P less than .05). Second-trimester debut of symptoms was followed more often by preterm delivery. Thus, patients with intrauterine hematomas continue to be a high-risk group for the remainder of their pregnancies.