Placental ratio in white and black women: relation to smoking and anemia

In a study of 7,000 pregnancies it was found that, particularly in black women, hemoglobin levels were lower in smokers than in nonsmokers. This is the reverse of previously reported findings in nonpregnant persons. At delivery, the mean ratio of placental weight to birth weight (placental ratio) wa...

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Bibliographic Details
Published inAmerican journal of obstetrics and gynecology Vol. 124; no. 7; p. 671
Main Authors Wingerd, J, Christianson, R, Lovitt, W V, Schoen, E J
Format Journal Article
LanguageEnglish
Published United States 01.04.1976
Subjects
African Continental Ancestry Group
Anemia - complications
Birth Weight
European Continental Ancestry Group
Female
Hemoglobins - analysis
Humans
Infant, Newborn
Organ Size
Placenta - anatomy & histology
Pregnancy
Smoking - complications
Time Factors
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Summary:In a study of 7,000 pregnancies it was found that, particularly in black women, hemoglobin levels were lower in smokers than in nonsmokers. This is the reverse of previously reported findings in nonpregnant persons. At delivery, the mean ratio of placental weight to birth weight (placental ratio) was higher in the infants of smokers than of nonsmokers. This observation is discussed in the light of reported elevated placental ratios at high altitudes or after severe anemia of pregnancy. The relationships are complex, and are not uniform with respect to ethnic group.
ISSN:0002-9378
DOI:10.1016/S0002-9378(16)33333-6