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R sub(1) and R sub(2) changes in the human placenta in response to maternal oxygen challenge

Magnetic resonance in medicine, 2013-11, Vol.70 (5), p.1427-1433 [Peer Reviewed Journal]

ISSN: 0740-3194 ;EISSN: 1522-2594 ;DOI: 10.1002/mrm.24581

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  • Title:
    R sub(1) and R sub(2) changes in the human placenta in response to maternal oxygen challenge
  • Author: Huen, Isaac ; Morris, David M ; Wright, Caroline ; Parker, Geoff JM ; Sibley, Colin P ; Johnstone, Edward D ; Naish, Josephine H
  • Subjects: Fetuses
  • Is Part Of: Magnetic resonance in medicine, 2013-11, Vol.70 (5), p.1427-1433
  • Description: Purpose Pregnancy complications such as preeclampsia and fetal growth restriction are sometimes thought to be caused by placental abnormalities associated with reduced oxygenation. Oxygen-enhanced MRI (R sub(1) contrast) and BOLD MRI (R sub(2)* contrast) have the potential to noninvasively investigate this oxygen environment at a range of gestational ages. Methods Scanning was carried out at 1.5 T under maternal air and oxygen breathing in a single placental slice in 14 healthy pregnant subjects of gestational ages 21-37 weeks. We report R sub(1) changes using a respiratory-triggered inversion recovery-turbo spin-echo sequence, which is sensitive to changes in PO sub(2), and R sub(2)* changes using a breathhold multiple gradient-recalled echo sequence sensitive to changes in oxygen saturation. Results Significant R sub(1) increases (P < 0.005, paired t-test) and R sub(2)* decreases (P < 0.0001, paired t-test) between air and oxygen breathing were demonstrated. Delta R sub(1) decreased with gestational age (P < 0.0005, r = -0.835, Pearson correlation test). No significant effect of gestational age on R sub(2)* change was observed. Conclusion The results demonstrate the feasibility of non-invasive investigation of placental oxygenation using MRI and the sensitivity of R sub(1) oxygen-enhanced MRI to gestational age. The techniques have the potential to provide unique noninvasive biomarkers in compromised pregnancies. Magn Reson Med 70:1427-1433, 2013. [copy 2012 Wiley Periodicals, Inc.
  • Language: English
  • Identifier: ISSN: 0740-3194
    EISSN: 1522-2594
    DOI: 10.1002/mrm.24581
  • Source: Alma/SFX Local Collection
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