Citation, DOI & article data
Threatened miscarriage (or threatened abortion) is mainly a clinical term, used when a pregnant woman in first 20 weeks of gestation presents with spotting, mild abdominal pain and contractions, with a closed cervical os 3.
It occurs in 20-25% of pregnancies and is associated with an increased rate of fetal loss (15-50%, compared to 2-7%).
Cervix is closed, and there is a live intrauterine gestation.
In many cases, the ultrasound will be either completely normal, or with a subchorionic hemorrhage.
Some features suggestive of a poor outcome:
- fetal bradycardia: <80-90 bpm
- small mean gestational sac diameter
- large and calcified yolk sac of more than 7 mm
- small or irregular gestational sac: MSD/CRL <5 mm
- large subchorionic hemorrhage more than 2/3 of gestational sac
- expanded amnion sign (an abnormally large amniotic cavity)
- absent or poor decidual reaction
Treatment and prognosis
Threatened miscarriage can go on to become any of:
- 1. Weissleder R, Wittenberg J, Harisinghani MMGH et-al. Primer of Diagnostic Imaging. Mosby. (2007) ISBN:0323040683. Read it at Google Books - Find it at Amazon
- 2. Thilaganathan B. Obstetric ultrasound. Churchill Livingstone. ISBN:0443054711. Read it at Google Books - Find it at Amazon
- 3. Mouri M, Mouri HH, Mouri RT, Mouri. Threatened Abortion. (2020) . doi: - Pubmed