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Placental perfusion in normal pregnancy and early and late preeclampsia: A magnetic resonance imaging study.
Uppsala universitet, Medicinska och farmaceutiska vetenskapsområdet, Medicinska fakulteten, Institutionen för kvinnors och barns hälsa. (Obstetrisk forskning/Högberg)
Uppsala universitet, Medicinska och farmaceutiska vetenskapsområdet, Medicinska fakulteten, Institutionen för kvinnors och barns hälsa. (Obstetrisk forskning/Högberg)
Uppsala universitet, Medicinska och farmaceutiska vetenskapsområdet, Medicinska fakulteten, Institutionen för kvinnors och barns hälsa. (Obstetrisk forskning/Högberg)
Uppsala universitet, Medicinska och farmaceutiska vetenskapsområdet, Medicinska fakulteten, Institutionen för radiologi, onkologi och strålningsvetenskap, Enheten för radiologi.
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2014 (engelsk)Inngår i: Placenta, ISSN 0143-4004, E-ISSN 1532-3102, Vol. 35, nr 3, s. 202-206Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

OBJECTIVE: Our primary aim was to investigate if women with early or late preeclampsia have different placental perfusion compared with normal pregnancies. A secondary aim was to investigate if placental perfusion changes with increasing gestational age in normal pregnancy.

METHODS: The study population included thirteen women with preeclampsia (five with early and eight with late preeclampsia) and nineteen women with normal pregnancy (ten with early and nine with late pregnancy). Early was defined as <34 weeks and late as ≥34 weeks gestation. All women underwent a magnetic resonance imaging (MRI) examination including a diffusion weighted sequence at 1.5 T. The perfusion fraction was calculated.

RESULTS: Women with early preeclampsia had a smaller placental perfusion fraction (p = 0.001) and women with late preeclampsia had a larger placental perfusion fraction (p = 0.011), compared to women with normal pregnancies at the corresponding gestational age. The placental perfusion fraction decreased with increasing gestational age in normal pregnancies (p = 0.001).

CONCLUSION: Both early and late preeclampsia differ in placental perfusion from normal pregnant women. Observed differences are however in the opposite direction, suggesting differences in pathophysiology. Placental perfusion decreases with increasing gestational age in normal pregnancy.

sted, utgiver, år, opplag, sider
2014. Vol. 35, nr 3, s. 202-206
HSV kategori
Identifikatorer
URN: urn:nbn:se:uu:diva-221884DOI: 10.1016/j.placenta.2014.01.008ISI: 000333495900008PubMedID: 24529946OAI: oai:DiVA.org:uu-221884DiVA, id: diva2:710316
Tilgjengelig fra: 2014-04-07 Laget: 2014-04-07 Sist oppdatert: 2017-12-05bibliografisk kontrollert
Inngår i avhandling
1. Placental Function: An Epidemiological and Magnetic Resonance Study
Åpne denne publikasjonen i ny fane eller vindu >>Placental Function: An Epidemiological and Magnetic Resonance Study
2015 (engelsk)Doktoravhandling, med artikler (Annet vitenskapelig)
Abstract [en]

Placental function is central for normal pregnancy and in many of the major pregnancy disorders. We used magnetic resonance imaging techniques to investigate placental function in normal pregnancy, in early and late preeclampsia and in intrauterine growth restriction. We also investigated maternal body mass index and height, as risk factors for preeclampsia.

A high body mass index and a short maternal stature increase the risk of preeclampsia, of all severities. The association seems especially strong between short stature and early preeclampsia, and a high body mass index and late preeclampsia. (Study I)

Using diffusion-weighted magnetic resonance imaging, we found that the placental perfusion fraction decreases with increasing gestational age in normal pregnancy. Also, the placental perfusion fraction is smaller in early preeclampsia, and larger in late preeclampsia, compared with normal pregnancies. That these differences are in opposite directions, suggests that there are differences in the underlying pathophysiology of early and late preeclampsia. (Study II)

Using magnetic resonance spectroscopy, we found that the phosphodiester spectral intensity fraction and the phosphodiester/phosphomonoester spectral intensity ratio increases with increasing gestational age. Also, we found that the phosphodiester spectral intensity fraction and the phosphodiester/phosphomonoester spectral intensity ratio are higher in early preeclampsia, compared with early normal pregnancy. These findings indicate increased apoptosis with increasing gestational age in normal pregnancy, and increased apoptosis in early preeclampsia. (Study III)

The placental perfusion fraction is smaller in intrauterine growth restriction than in normal pregnancy. Fetal growth, Doppler blood flow in maternal and fetal vessels, infant birth weight and plasma markers of placental function are all correlated to the placental perfusion fraction. The placental perfusion fraction examination seems therefore to offer a fast, direct estimate of the degree of placental dysfunction. (Study IV)

In conclusion: Our findings in studies I-III all support the hypothesis of partly different pathophysiology between early and late preeclampsia, and suggest a strong link between early preeclampsia and placental dysfunction. Study IV shows that the placental perfusion fraction has potential to contribute to the clinical assessment of placental dysfunction.

sted, utgiver, år, opplag, sider
Uppsala: Acta Universitatis Upsaliensis, 2015. s. 72
Serie
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Medicine, ISSN 1651-6206 ; 1066
Emneord
body height, body mass index, early preeclampsia, late preeclampsia, magnetic resonance imaging, placenta, perfusion, IVIM, risk factors, energy metabolism, magnetic resonance spectroscopy, 31P-MRS
HSV kategori
Forskningsprogram
Obstetrik och gynekologi
Identifikatorer
urn:nbn:se:uu:diva-239294 (URN)978-91-554-9142-0 (ISBN)
Disputas
2015-02-27, Auditorium Minus, Gustavianum, Akademigatan 3, Uppsala, 09:00 (svensk)
Opponent
Veileder
Tilgjengelig fra: 2015-02-05 Laget: 2014-12-21 Sist oppdatert: 2015-03-09

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