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Continuous Telemetric In Utero Tracheal Pressure Measurements in Fetal Lambs
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Pregnancy is associated with a decrease in pharyngeal but not tracheal or laryngeal cross-sectional area: a pilot

N Leboulanger1, N Louvet2, A Rigouzzo2

  • 1Department of Head and Neck Surgery, Armand-Trousseau Hospital, Université Paris, Paris, France.

International Journal of Obstetric Anesthesia
|December 17, 2013
PubMed
Summary
This summary is machine-generated.

Pregnancy narrows the pharynx, increasing airway access risk. Tracheal size remains stable, but the Mallampati score rises, indicating potential airway changes during gestation.

Keywords:
Acoustic reflection methodLarynxPharynxPregnancyTrachea

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Area of Science:

  • Obstetrics and Gynecology
  • Anesthesiology
  • Respiratory Physiology

Background:

  • Pregnancy, particularly labor, elevates risks associated with difficult upper airway access.
  • Limited research exists on upper airway caliber changes during pregnancy.
  • The acoustic reflection method offers non-invasive, longitudinal assessment of upper airway dimensions.

Purpose of the Study:

  • To evaluate upper airway caliber changes throughout normal pregnancy using the acoustic reflection method.
  • To assess the relationship between pregnancy and pharyngeal and tracheal cross-sectional areas.
  • To investigate changes in the Mallampati score during pregnancy.

Main Methods:

  • Prospective, single-center observational study involving healthy pregnant women.
  • Utilized the acoustic reflection method for upper airway assessment.
  • Evaluated participants during the first, second, and third trimesters, and post-delivery (2 days and 1 month).

Main Results:

  • A significant decrease in mean pharyngeal cross-sectional area was observed from the first to the third trimester (P < 0.001).
  • No significant changes were noted in minimal or mean tracheal cross-sectional areas.
  • The Mallampati score significantly increased during pregnancy (P < 0.001).

Conclusions:

  • Normal pregnancy is linked to a reduced pharyngeal cross-sectional area, assessed via acoustic reflection.
  • An increased Mallampati score correlates with these pharyngeal changes during pregnancy.
  • Tracheal dimensions remain unaffected in the studied population during normal pregnancy.