Objective: To find the relationship between the volume ratio of subchorionic hematoma (SCH) to gestation sac measured by three-dimensional ultrasound and pregnancy outcome of patients with threatened abortion.
Study design: Descriptive study.
Place and duration of study: The Second Affiliated Hospital of Soochow University, Suzhou, China, from January 2016 to December 2020.
Methodology: Medical data of patients, who were diagnosed with threatened abortion (persistent or intermittent vaginal bleeding) were collected. All included patients underwent ultrasonography for SCH at gestation age of 6-8 weeks. According to the patients' evaluation, they were classified into a case group combined with threatened abortion and SCH (n=145), and a control group with threatened abortion (n=76). The clinical data and three-dimensional ultrasound parameters of the two groups were compared to find the relationship between the volume ratio of SCH to gestation sac and pregnancy outcome.
Results: In the case group, the hospital stay was longer, the abdominal pain, its duration ≥7 days, and adverse pregnancy outcomes were higher than in the control group (p<0.05). Patients with moderate and severe area ratio and volume ratio of SCH to gestation sac were significantly related to higher abortion and stillbirth rates than patients with mild ratio (p<0.05). The area under the curve, sensitivity and specificity of the volume ratio of SCH to gestation sac in predicting abortion and stillbirth were higher than that of the area ratio of SCH to gestation sac.
Conclusion: The volume ratio of SCH to gestation sac by three-dimensional ultrasound in first-trimester plays an important role to predict pregnancy outcome.
Key words: Ultrasonography, Hematoma, Pregnancy outcome, Threatened abortion, ROC curve.