Seminars in Thrombosis and Hemostasis, Inhaltsverzeichnis

Semin Thromb Hemost 2020; 46(04): 435-445
DOI: 10.1055/s-0039-3400258

Review Article

Thieme Medical Publishers 333 Seventh Avenue, New York, NY 10001, USA.

High-Risk Pregnancies and Their Impact on Neonatal Primary Hemostasis

Marianna Politou^*

¹Hematology Laboratory-Blood Bank, Aretaieio Hospital, National and Kapodistrian University of Athens, Athens, Greece

,

Vasiliki Mougiou^*

²Neonatal Department, Aretaieio Hospital, Medical School, National and Kapodistrian University of Athens, Athens, Greece

,

Maria Kollia

²Neonatal Department, Aretaieio Hospital, Medical School, National and Kapodistrian University of Athens, Athens, Greece

,

Rozeta Sokou

²Neonatal Department, Aretaieio Hospital, Medical School, National and Kapodistrian University of Athens, Athens, Greece

,

Georgios Kafalidis

²Neonatal Department, Aretaieio Hospital, Medical School, National and Kapodistrian University of Athens, Athens, Greece

,

Zoi Iliodromiti

²Neonatal Department, Aretaieio Hospital, Medical School, National and Kapodistrian University of Athens, Athens, Greece

,

Serena Valsami

¹Hematology Laboratory-Blood Bank, Aretaieio Hospital, National and Kapodistrian University of Athens, Athens, Greece

,

Theodora Boutsikou

²Neonatal Department, Aretaieio Hospital, Medical School, National and Kapodistrian University of Athens, Athens, Greece

,

Nicoletta Iacovidou

²Neonatal Department, Aretaieio Hospital, Medical School, National and Kapodistrian University of Athens, Athens, Greece

› Institutsangaben

Abstract

Primary hemostasis, similar to other systems in the adjusting and transitioning neonate, undergoes developmental adaptations in the first days of life. Although platelets of neonates do not differ quantitatively compared with those of adults, they functionally present with major differences, thus supporting the theory of a “hypofunctional” phenotype that is counterbalanced by high hematocrit and more potent von Willebrand factor multimers. No clinical effect of bleeding tendency has hence been established so far for healthy term neonates. However, discrepancies in functionality have been noted, associated with gestational age, with more pronounced platelet hyporesponsiveness in preterm neonates. Multiple methods of in vitro platelet function evaluation such as PFA-100/200, platelet aggregometry, flow cytometry, and cone and platelet analyzer have been used for assessment of neonatal primary hemostasis. Several pregnancies are characterized as “high-risk” when risk factors preexist in maternal history or evolve during pregnancy. These pregnancies require specialized observation as they may have unpredictable outcome. High-risk pregnancies include clinical entities such as preeclampsia, pregnancy-induced smoking during pregnancy, gestational diabetes mellitus (GDM), autoimmune diseases, and other maternal hematological conditions. In some cases, like systemic lupus erythematosus, antiphospholipid antibody syndrome, and maternal immunologically based thrombocytopenia, neonatal thrombocytopenia is regarded as a prominent hemostasis defect, while in others, like pregnancy-induced hypertension and preeclampsia, both quantitative and qualitative disorders of neonatal platelets have been reported. In other pathologies, like GDM, neonatal primary hemostasis remains vastly unexplored, which raises the need for further investigation. The extent to which primary hemostasis is affected in neonates of high-risk pregnancies is the main objective of this narrative review.

Keywords

Keywords

platelets - platelet function - neonates - primary hemostasis - high-risk pregnancies - neonatal hemostasis

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