Effect of gestational age on the acquisition of middle cerebral artery waveforms in twin pregnancies from 22 weeks gestation to term [Poster]

Hdl Handle:
http://hdl.handle.net/10147/128782
Title:
Effect of gestational age on the acquisition of middle cerebral artery waveforms in twin pregnancies from 22 weeks gestation to term [Poster]
Authors:
Breathnach, F M; Carrol, S; McAuliffe, F; Geary, M; Daly, S; Higgins, John R.; Dornan, J; Morrison, J; Burke, G; Higgins, F; Malone, Fergal D
Affiliation:
Royal College of Surgeons in Ireland, Dublin, Ireland, National Maternity Hospital, Dublin, Ireland, Rotunda Hospital, Dublin, Ireland, Coombe Women’s and Infants’ University Hospital, Dublin, Ireland, University College Hospital, Galway, Ireland, Royal Maternity Hospital, Belfast, Ireland, Cork University Maternity Hospital, Cork, Ireland, Our Lady of Lourdes Hospital, Drogheda, Ireland, Regional Maternity Hospital, Limerick, Ireland
Citation:
Arch Dis Child Fetal Neonatal Ed 2009;94:Fa11-Fa25
Issue Date:
2009
URI:
http://hdl.handle.net/10147/128782
Additional Links:
http://fn.bmj.com/content/94/Suppl_1/Fa11.full
Item Type:
Presentation
Language:
en
Description:
Objective: To evaluate the impact of gestational age on successful acquisition of middle cerebral artery (MCA) waveforms in twin gestations. Methods: Eight experienced research sonographers received practical training in assessment of MCA blood flow in twin gestations participating in a large multicentre twin study. The success rate of acquisition of Doppler indices was analysed over time in a consecutive cohort of 300 twin pairs. Images were submitted to a central data quality assurance committee. Regression analysis was used to determine the effect of advancing gestational age and other factors on successful MCA Doppler interrogation. Results: A combined total of 1681 ultrasound examinations of 300 twin pregnancies were performed between 22 weeks’ gestation and term. 85% of pregnancies were dichorionic. 74% of examinations were successful in obtaining a satisfactory MCA waveform for both fetuses. The overall frequency of unsuccessful examinations increased with advancing gestation (correlation coefficient 0.169, p<0.001) with a significant fall in MCA acquisition beyond 34 weeks. In the third trimester, the frequency of successful studies was higher for the non-presenting fetus (71% vs 57% for the presenting fetus (p<0.001). Conclusions: Successful acquisition of the MCA waveform in twin pregnancies correlates with gestational age. As multi-vessel Doppler studies are increasingly being incorporated into fetal assessment of twin pregnancies, the lower prospect of obtainable MCA waveforms beyond 34 weeks, particularly in the presenting fetus, renders this modality less applicable at advanced gestational age.
Keywords:
PREGNANCY; MULTIPLE BIRTHS

Full metadata record

DC FieldValue Language
dc.contributor.authorBreathnach, F Men
dc.contributor.authorCarrol, Sen
dc.contributor.authorMcAuliffe, Fen
dc.contributor.authorGeary, Men
dc.contributor.authorDaly, Sen
dc.contributor.authorHiggins, John R.en
dc.contributor.authorDornan, Jen
dc.contributor.authorMorrison, Jen
dc.contributor.authorBurke, Gen
dc.contributor.authorHiggins, Fen
dc.contributor.authorMalone, Fergal Den
dc.date.accessioned2011-04-27T15:22:17Z-
dc.date.available2011-04-27T15:22:17Z-
dc.date.issued2009-
dc.identifier.citationArch Dis Child Fetal Neonatal Ed 2009;94:Fa11-Fa25en
dc.identifier.urihttp://hdl.handle.net/10147/128782-
dc.descriptionObjective: To evaluate the impact of gestational age on successful acquisition of middle cerebral artery (MCA) waveforms in twin gestations. Methods: Eight experienced research sonographers received practical training in assessment of MCA blood flow in twin gestations participating in a large multicentre twin study. The success rate of acquisition of Doppler indices was analysed over time in a consecutive cohort of 300 twin pairs. Images were submitted to a central data quality assurance committee. Regression analysis was used to determine the effect of advancing gestational age and other factors on successful MCA Doppler interrogation. Results: A combined total of 1681 ultrasound examinations of 300 twin pregnancies were performed between 22 weeks’ gestation and term. 85% of pregnancies were dichorionic. 74% of examinations were successful in obtaining a satisfactory MCA waveform for both fetuses. The overall frequency of unsuccessful examinations increased with advancing gestation (correlation coefficient 0.169, p<0.001) with a significant fall in MCA acquisition beyond 34 weeks. In the third trimester, the frequency of successful studies was higher for the non-presenting fetus (71% vs 57% for the presenting fetus (p<0.001). Conclusions: Successful acquisition of the MCA waveform in twin pregnancies correlates with gestational age. As multi-vessel Doppler studies are increasingly being incorporated into fetal assessment of twin pregnancies, the lower prospect of obtainable MCA waveforms beyond 34 weeks, particularly in the presenting fetus, renders this modality less applicable at advanced gestational age.en
dc.language.isoenen
dc.relation.urlhttp://fn.bmj.com/content/94/Suppl_1/Fa11.fullen
dc.subjectPREGNANCYen
dc.subjectMULTIPLE BIRTHSen
dc.titleEffect of gestational age on the acquisition of middle cerebral artery waveforms in twin pregnancies from 22 weeks gestation to term [Poster]en
dc.typePresentationen
dc.contributor.departmentRoyal College of Surgeons in Ireland, Dublin, Ireland, National Maternity Hospital, Dublin, Ireland, Rotunda Hospital, Dublin, Ireland, Coombe Women’s and Infants’ University Hospital, Dublin, Ireland, University College Hospital, Galway, Ireland, Royal Maternity Hospital, Belfast, Ireland, Cork University Maternity Hospital, Cork, Ireland, Our Lady of Lourdes Hospital, Drogheda, Ireland, Regional Maternity Hospital, Limerick, Irelanden
dc.description.provinceLeinster-
All Items in Lenus, The Irish Health Repository are protected by copyright, with all rights reserved, unless otherwise indicated.