Subchorionic hematoma volume in the first trimester and risk of spontaneous abortion

Resumen

Objective: to establish an association between subchorionichematoma volume and risk of spontaneous abortion.Methods: patients with viable intrauterine pregnancy between6 and 13 weeks were included and with diagnosisof subchorionic hematoma with or without genital bleedingand visible heart rate by ultrasound. Patients weredivided into two groups depending on the interruptionor continuity of pregnancy: patients who presented spontaneousabortion and patients who continued with theirpregnancy after the first trimester.Settings: Maternity “Dr. Armando Castillo Plaza” andHospital “Dr. Urquinaona”. Maracaibo, Venezuela.Results: Two hundred patients were selected. The gestationalage at the moment of the ultrasound evaluation was9.2 ± 2.0 weeks and the mean value of subchorionic hematomavolume was 22.4 ± 12.2 cm3. The rate of spontaneousabortion in the group was 33.5%. Patients who presentedspontaneous abortion did not show significant differencesin the maternal age and gestational age at the moment ofthe ultrasound evaluation compared to those who continuedwith their pregnancy (p = ns). Patients with spontaneousabortion presented higher mean values of subchorionichematoma volume (p = 0.05). Relative risk were significantfor groups who presented hematomas considered big (relativerisk = 1.74; interval confidence 95%, 1.20 – 2.44) andvery big (relative risk = 4.19, interval confidence 95%, 2.51– 7.02; p < 0.05).Conclusion: There is an association between the first trimestersubchorionic hematoma volume and an increasedrisk of spontaneous abortion