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[Hemoglobin--an obstetric risk factor]

L Heilmann¹, B Hojnacki, B Herrle

¹Abt. Gynäkologie und Geburtshilfe Stadtkrankenhaus Rüsselsheim.

Geburtshilfe Und Frauenheilkunde

|April 1, 1993

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High hemoglobin levels during pregnancy are linked to increased risks of preterm birth, growth issues, and newborn complications. This suggests higher blood viscosity may impair placental function.

Area of Science:

Obstetrics and Gynecology
Maternal-Fetal Medicine
Hematology

Context:

Investigated the association between maternal hemoglobin levels during the second trimester and pregnancy outcomes.
Utilized prospective study data including hemoglobin, blood pressure, proteinuria, and fetal cardiotocograms.
Examined perinatal morbidity in relation to maternal hematological status.

Purpose:

To explore the correlation between elevated second-trimester hemoglobin concentrations and adverse pregnancy outcomes.
To identify if high maternal hemoglobin is a risk factor for conditions like preterm birth, intrauterine growth retardation, and gestational hypertension.
To assess the link between high hemoglobin levels and specific neonatal morbidities such as respiratory distress syndrome and hyperviscosity.

Summary:

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Women with hemoglobin levels >= 13 g/dl between 14-30 weeks gestation showed significantly higher rates of preterm birth (25%), intrauterine growth retardation (7.6%), gestational hypertension (31.5%), and low birth weight (10.3%).
High maternal hemoglobin was also associated with increased perinatal morbidity, including respiratory distress syndrome (9.3%) and newborn hyperviscosity (23.9%).
Findings support the hypothesis that increased blood viscosity or reduced hemodilution in pregnancy can lead to poor placental perfusion.

Impact:

Highlights the potential risks associated with elevated maternal hemoglobin during pregnancy.
Suggests that monitoring hemoglobin levels in the second trimester may aid in identifying pregnancies at higher risk for adverse outcomes.
Provides evidence for the role of blood viscosity in placental function and fetal well-being.