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dc.contributor.authorHassan, T
dc.contributor.authorO'Coigligh, S
dc.contributor.authorHiggins, S
dc.date.accessioned2012-02-01T10:21:43Z
dc.date.available2012-02-01T10:21:43Z
dc.date.issued2012-02-01T10:21:43Z
dc.identifier.citationIr Med J. 2011 Sep;104(8):243-5.en_GB
dc.identifier.issn0332-3102 (Print)en_GB
dc.identifier.issn0332-3102 (Linking)en_GB
dc.identifier.pmid22125879en_GB
dc.identifier.urihttp://hdl.handle.net/10147/207367
dc.description.abstractThe aim of this audit was to assess the accuracy of transabdominal ultrasound scan in predicting chorionicity in twin pregnancies in our unit. The presence or absence of lambda sign, T-sign, dividing membrane thickness and number of placentae were used to determine chorionicity. We retrospectively analysed these antenatal markers in 268 sets of twins delivered over a 5 year period and compared it with the postpartum placental histology and neonatal gender. Of 268 twin deliveries, 204 (76%) had both chorionicity and placental histology to compare. 67 of 84 (80%) were correctly diagnosed antenatally as monochorionic and 137 of 151 (91%) as dichorionic. In 31 cases (15%) the ultrasound diagnosis of chorionicity didn't match placental histology. Seventeen were thought to be monochorionic antenatally but were confirmed dichorionic on placental histology. Overall chorionicity was correctly diagnosed in 171/204 (84%) using transabdominal ultrasound scan (USS) in all trimesters. However the sensitivity and specificity of USS was much higher for dichorionic twins when carried out before 14 weeks of gestation.
dc.language.isoengen_GB
dc.subject.meshAdulten_GB
dc.subject.meshChorion/*ultrasonographyen_GB
dc.subject.meshFemaleen_GB
dc.subject.meshGestational Ageen_GB
dc.subject.meshHumansen_GB
dc.subject.meshPregnancyen_GB
dc.subject.meshRetrospective Studiesen_GB
dc.subject.meshSensitivity and Specificityen_GB
dc.subject.mesh*Twinsen_GB
dc.subject.meshUltrasonography, Prenatal/*methodsen_GB
dc.titlePrenatal diagnosis of chorionicity in twins.en_GB
dc.contributor.departmentOur Lady of Lourdes, Drogheda, Co Louth. tayyabahassan@hotmail.comen_GB
dc.identifier.journalIrish medical journalen_GB
dc.description.provinceLeinster
html.description.abstractThe aim of this audit was to assess the accuracy of transabdominal ultrasound scan in predicting chorionicity in twin pregnancies in our unit. The presence or absence of lambda sign, T-sign, dividing membrane thickness and number of placentae were used to determine chorionicity. We retrospectively analysed these antenatal markers in 268 sets of twins delivered over a 5 year period and compared it with the postpartum placental histology and neonatal gender. Of 268 twin deliveries, 204 (76%) had both chorionicity and placental histology to compare. 67 of 84 (80%) were correctly diagnosed antenatally as monochorionic and 137 of 151 (91%) as dichorionic. In 31 cases (15%) the ultrasound diagnosis of chorionicity didn't match placental histology. Seventeen were thought to be monochorionic antenatally but were confirmed dichorionic on placental histology. Overall chorionicity was correctly diagnosed in 171/204 (84%) using transabdominal ultrasound scan (USS) in all trimesters. However the sensitivity and specificity of USS was much higher for dichorionic twins when carried out before 14 weeks of gestation.


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