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Ultrasonic prediction of growth discordancy by intertwin difference in abdominal circumference
Author(s) -
Blickstein I.,
Friedman A.,
Caspi B.,
Lancet M.
Publication year - 1989
Publication title -
international journal of gynecology and obstetrics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.895
H-Index - 97
eISSN - 1879-3479
pISSN - 0020-7292
DOI - 10.1016/0020-7292(89)90840-0
Subject(s) - medicine , ultrasonic sensor , obstetrics , circumference , radiology , mathematics , geometry
Intertwin abdominal circumference (AC) and femur length (FL) differences were studied in 24 growth‐discordant (⩾15% birth weight difference) and in 32‐growth concordant twin pairs delivered within 2 weeks of the last ultrasonic examination. Both groups were of similar gestational age but differed significantly in the mean twin birth weight and intertwin AC difference (P = 0.01 and P = 0.00009, respectively). A cutoff value (⩾18 mm) for AC difference was found to discriminate significantly (P < 0.0009) between concordant and discordant pairs with sensitivity, specificity, positive predictive value and negative predictive value of 66.7%, 78%, 69.5% and 75.7%, respectively. These data may suggest that an intertwin difference of 18 mm or more in AC effectively screens for the diagnosis of 15% or more birth weight difference in twin pregnancies.