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Increase in ambient temperature may explain decrease in amniotic fluid index

A C Sciscione1, K A Costigan, T R Johnson

  • 1Department of Gynecology and Obstetrics, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA.

American Journal of Perinatology
|May 1, 1997
PubMed
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High ambient temperatures can decrease amniotic fluid index (AFI) in pregnant women during the third trimester. This inverse relationship between heat exposure and AFI suggests environmental factors impact fetal well-being assessments.

Area of Science:

  • Obstetrics and Gynecology
  • Environmental Health
  • Maternal-Fetal Medicine

Background:

  • Amniotic fluid index (AFI) is a key indicator of fetal well-being.
  • Maternal hydration status significantly influences AFI, especially in the third trimester.
  • Increased ambient temperatures can lead to maternal dehydration via insensible fluid loss.

Purpose of the Study:

  • To investigate the hypothesis that rising ambient temperatures are associated with a decrease in AFI.
  • To determine the correlation between environmental heat exposure and amniotic fluid levels in pregnant women.

Main Methods:

  • A prospective study involving 42 women in their third trimester (27-40 weeks' gestation) with singleton pregnancies.
  • Serial AFI measurements were recorded weekly during a period of high ambient temperatures (June-August 1993).

Related Experiment Videos

  • Spearman-rank correlation was used to compare 2-, 3-, and 4-day mean ambient temperatures with AFI values.

    • Main Results:

    • A significant inverse correlation was observed between mean ambient temperatures and AFI.
    • The strongest correlation was found using the 4-day mean temperature (r = 0.31, p < 0.001).
    • Observed AFI values ranged from 1.7 to 24.7 cm, with temperatures ranging from 71 to 104 degrees F.

    Conclusions:

    • Ambient temperature fluctuations are inversely correlated with changes in AFI.
    • Environmental heat and potential maternal dehydration should be considered when interpreting AFI.
    • This finding highlights the importance of environmental factors in assessing fetal well-being via AFI.