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Clinical Research
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Maternal and Fetal Outcomes of Pregnancies in Women with Atypical Hemolytic Uremic Syndrome

Martina Gaggl, Christof Aigner, Dorottya Csuka, Ágnes Szilágyi, Zoltán Prohászka, Renate Kain, Natalja Haninger, Maarten Knechtelsdorfer, Raute Sunder-Plassmann, Gere Sunder-Plassmann and Alice Schmidt
JASN March 2018, 29 (3) 1020-1029; DOI: https://doi.org/10.1681/ASN.2016090995
Martina Gaggl
1Division of Nephrology and Dialysis, Department of Medicine III,
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Christof Aigner
1Division of Nephrology and Dialysis, Department of Medicine III,
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Dorottya Csuka
2Research Laboratory, 3rd Department of Medicine, Semmelweis University, Budapest, Hungary; and
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Ágnes Szilágyi
2Research Laboratory, 3rd Department of Medicine, Semmelweis University, Budapest, Hungary; and
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Zoltán Prohászka
2Research Laboratory, 3rd Department of Medicine, Semmelweis University, Budapest, Hungary; and
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Renate Kain
3Clinical Institute of Pathology, and
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Natalja Haninger
1Division of Nephrology and Dialysis, Department of Medicine III,
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Maarten Knechtelsdorfer
4Department of Nephrology, Wilhelminenspital, Vienna, Austria
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Raute Sunder-Plassmann
5Genetics Laboratory, Department of Laboratory Medicine, Medical University of Vienna, Vienna, Austria;
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Gere Sunder-Plassmann
1Division of Nephrology and Dialysis, Department of Medicine III,
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Alice Schmidt
1Division of Nephrology and Dialysis, Department of Medicine III,
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Abstract

Atypical HUS (aHUS) is a disorder most commonly caused by inherited defects of the alternative pathway of complement, or the proteins that regulate this pathway, and life-threatening episodes of aHUS can be provoked by pregnancy. We retrospectively and prospectively investigated 27 maternal and fetal pregnancy outcomes in 14 women with aHUS from the Vienna Thrombotic Microangiopathy Cohort. Seven pregnancies (26%) were complicated by pregnancy-associated aHUS (p-aHUS), of which three appeared to be provoked by infection, bleeding, and curettage, and three individuals were considered to have preeclampsia/HELLP syndrome before the definitive diagnosis of p-aHUS was made. Mutations in genes that encode the complement alternative pathway proteins or the molecules that regulate this pathway were detected in 71% of the women, with no relationship to pregnancy outcome. Twenty-one pregnancies (78%) resulted in a live birth, two preterm infants were stillborn, and four pregnancies resulted in early spontaneous abortions. Although short-term renal outcome was good in most women, long-term renal outcome was poor; among the 14 women, four had CKD stage 1–4, five had received a renal allograft, and three were dialysis-dependent at study end. We prospectively followed nine pregnancies of four women and treated six of these pregnancies with prophylactic plasma infusions (one pregnancy resulted in p-aHUS, one intrauterine fetal death occurred, and seven pregancies were uneventful). Our study emphasizes the frequency of successful pregnancies in women with aHUS. Close monitoring of such pregnancies for episodes of thrombotic microangiopathy is essential but, the best strategy to prevent these episodes remains unclear.

  • atypical hemolytic uremic syndrome
  • aHUS
  • pregnancy
  • TMA
  • complement-mediated
  • Copyright © 2018 by the American Society of Nephrology
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Journal of the American Society of Nephrology: 29 (3)
Journal of the American Society of Nephrology
Vol. 29, Issue 3
March 2018
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Maternal and Fetal Outcomes of Pregnancies in Women with Atypical Hemolytic Uremic Syndrome
Martina Gaggl, Christof Aigner, Dorottya Csuka, Ágnes Szilágyi, Zoltán Prohászka, Renate Kain, Natalja Haninger, Maarten Knechtelsdorfer, Raute Sunder-Plassmann, Gere Sunder-Plassmann, Alice Schmidt
JASN Mar 2018, 29 (3) 1020-1029; DOI: 10.1681/ASN.2016090995

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Maternal and Fetal Outcomes of Pregnancies in Women with Atypical Hemolytic Uremic Syndrome
Martina Gaggl, Christof Aigner, Dorottya Csuka, Ágnes Szilágyi, Zoltán Prohászka, Renate Kain, Natalja Haninger, Maarten Knechtelsdorfer, Raute Sunder-Plassmann, Gere Sunder-Plassmann, Alice Schmidt
JASN Mar 2018, 29 (3) 1020-1029; DOI: 10.1681/ASN.2016090995
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Keywords

  • atypical hemolytic uremic syndrome
  • aHUS
  • pregnancy
  • TMA
  • complement-mediated

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