How Effective is Ultrasound in Diagnosing Placenta Accreta?
This study by Bowman et al. (AJOG, 2014) aimed to evaluate the accuracy of ultrasound in predicting placenta accreta.
Blinded Ultrasound Performance Review
229 ultrasound studies from 55 patients with accreta, and 56 without, were examined by six investigators. Ultrasound performance for accreta was as follows: 27.0% were true positives; 5.9% were false positives; 38.8% were true negatives; 16.0% were false negatives; and 12.3% had an uncertain diagnosis. Previous data from unblinded studies suggest that ultrasound can be upward of 90% accurate in diagnosing placenta accreta, but these findings suggest that ultrasound as an independent tool may be less effective than previously believed. Clinical factors, such as multiple previous C-sections, remain critical to the evaluation and management of placenta accreta.
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