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Prenatal care and infant lead exposure
J C Recknor1, J R Reigart, P M Darden
1Department of Pediatrics, Medical University of South Carolina, Charleston, USA.
Insights
Inadequate prenatal care is linked to higher infant blood lead levels, especially in low birth weight babies. This highlights potential risks associated with reduced maternal care and developmental factors influencing lead exposure in early childhood.
Area of Science:
- Environmental Health
- Pediatrics
- Public Health
Background:
- Prenatal care is crucial for maternal and infant health outcomes.
- Lead exposure in infancy poses significant health risks.
- Understanding factors influencing lead exposure is vital for prevention.
Purpose of the Study:
- To investigate the relationship between the quality of prenatal care received by mothers and the blood lead concentrations in their infants.
- To identify potential risk factors for elevated infant blood lead levels.
Main Methods:
- A retrospective survey of 200 infants (6-22 months) in Charleston, SC, with high lead poisoning prevalence.
- Data linkage between birth records and lead screening records to assess prenatal care use.
- Logistic regression analysis to identify predictors of high blood lead levels.
Main Results:
- 37% of infants had elevated blood lead levels (≥10 microg/dl).
- Higher blood lead levels were observed with less adequate prenatal care, with 42% of infants receiving inadequate care having high lead levels.
- Low birth weight (<2500 gm) and older age at screening were significantly associated with higher blood lead levels.
Conclusions:
- Suboptimal prenatal care may correlate with increased risk factors for infant lead exposure.
- Low birth weight is a significant predictor of elevated infant blood lead levels.
- Further research is needed to elucidate the mechanisms linking low birth weight, intrauterine exposure, and infant lead levels.
Objective:
The objective of the study was to determine the relation between prenatal care of mothers and blood lead concentrations in their offspring in the first year of life.
Methods:
A retrospective survey was conducted of 200 predominantly black infants between the ages of 6 and 22 months (mean age, 13.4 months). The infants had been screened for the first time since birth at the Charleston County (South Carolina) Health Department. They resided in a neighborhood with the highest prevalence of lead poisoning in Charleston. Prenatal care use data were obtained after matching birth records with lead-screening records.
Results:
Seventy-three infants (37%) had blood lead levels 0.48 micromol/L (> or = 10 microg/dl) or higher. Adequacy of prenatal care, defined by the Modified Kessner Index, showed 11% with intensive care (26% of these with high lead levels), 39% with adequate care (35% high blood lead levels), 35% with intermediate care (40% with high blood lead levels), 13% with inadequate care (42% with high blood lead levels), and 2% with no prenatal care (25% with high blood lead levels). With the exception of the small group with no prenatal care (n = 4), the proportion of infants with a high blood lead level was inversely proportional to the level of care. The logistic regression model that best fit the data included age at screen for lead and birth weight. Low birth weight babies (<2500 gm) were more likely to have a high blood lead level at primary screen than babies who were heavier at birth (odds ratio, 2.60; p = 0.04), and the older the baby at screening, the greater the likelihood of a high blood lead level (odds ratio, 1.23; p = 0.01). There was a trend for black infants to have a high blood lead level more often than white infants (odds ratio, 3.05; p = 0.06).
Conclusions:
Less than adequate use of prenatal care may reflect an increase in risk factors contributing to lead exposure in infancy. Low birth weight also was related to high blood lead levels. Further studies are required to differentiate among several hypotheses for this effect. Intrauterine lead exposure, which is known to reduce birth weight, may contribute to measured blood lead levels at first screen. Alternatively, low birth weight may increase lead absorption and retention in infancy or may increase risk of lead exposure.