Abstract
AbstractTransvaginal sonography (TVS) of the cervix has been shown to be superior to the digital examination in detecting patients at risk for sponatenous preterm birth. The cervical length, width, length or area of the internal os (funneling) and, to some extent, the position and structure of the cervix, can be determined from ultrasound images. We have established longitudinal sonographic criteria separate for twin and singleton pregnancies in a vertical and horizontal position of the patient. Shortening of the cervical length and funneling occur earlier in an upright compared to a supine maternal position and in twin compared to singleton pregnancies. For dividing high-risk and low-risk groups, we considered the cut-off values specific for gestational age, position and singleton or twin pregnancy. Multiple logistic regression revealed that, between 20 and 24 + 6 weeks and between 25 and 29 + 6 weeks, funnel width in an upright position and the detection of fibronectin were the most significant independ...
Published Version
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