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[Elastography of cervix to predict delay from induction to delivery]
L Sonnier1, P Bouhanna1, C Arnou1
1Département d'obstétrique et de gynécologie, centre hospitalier Poissy-Saint-Germain, rue du Champ-Gaillard, 78303 Poissy cedex, France.
Gynecologie, Obstetrique & Fertilite
|December 3, 2014
Summary
Cervical elastography, an objective assessment of tissue consistency, was evaluated to predict labor induction duration. This study found qualitative cervical elastography to be a poor predictor for predicting delivery time in pregnant women with a low Bishop score.
Area of Science:
- Obstetrics and Gynecology
- Medical Imaging
- Reproductive Medicine
Background:
- Induction of labor is a common obstetric procedure.
- The Bishop score is the standard method for predicting labor induction duration.
- Objective assessment methods are needed to improve prediction accuracy.
Purpose of the Study:
- To evaluate the effectiveness of cervical strain elastography in predicting the time from labor induction to delivery.
- To assess if elastography can predict delays in labor induction for women with a low Bishop score (<6).
Main Methods:
- Ultrasound elastography was performed before labor induction and, in some cases, before a second dose of misoprostol.
- A color map indicated tissue consistency (blue=hard, red=soft).
- Predictive values (sensitivity, specificity, PPV, NPV) for vaginal delivery within 24 hours were calculated, excluding cesarean sections.
Main Results:
- Elastography before induction had low predictive values (Sensitivity: 40%, Specificity: 27.3%, PPV: 55.6%, NPV: 16.7%).
- Elastography before the second dose showed higher sensitivity (64.3%) but lower specificity (16.7%).
- Among 8 patients with a "red" cervical color map on the second exam, sensitivity was 83.3% but specificity was 0%.
Conclusions:
- Qualitative cervical elastography is not a reliable predictor for the duration of induced labor in women with a low Bishop score.
- Further research may be needed to refine elastography techniques for obstetric applications.
