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Related Experiment Videos

Ventilatory drive and respiratory muscle function in pregnancy.

G Contreras1, M Gutiérrez, T Beroíza

  • 1Department of Respiratory Disease, School of Medicine, Universidad Católica de Chile, Santiago.

The American Review of Respiratory Disease
|October 1, 1991
PubMed
Summary

During pregnancy, increased respiratory impedance and ventilatory drive stabilize minute ventilation (VE). Respiratory muscle function remains normal, but expiratory reserve volume (ERV) decreases due to elevated end-expiratory gastric pressure (Pga).

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Area of Science:

  • Physiology
  • Respiratory Medicine
  • Obstetrics

Background:

  • Pregnancy significantly alters respiratory physiology, including decreased expiratory reserve volume (ERV) and initial increases in minute ventilation (VE).
  • Understanding the mechanisms behind these changes, such as thoracoabdominal mechanics and respiratory control, is crucial.

Purpose of the Study:

  • To investigate the roles of thoracoabdominal mechanics, breathing control, and inspiratory muscle function in pregnancy-induced respiratory alterations.
  • To quantify changes in inspiratory pressures, lung volumes, thoracic configuration, and respiratory drive throughout gestation.

Main Methods:

  • Studied 18 pregnant women at multiple gestational weeks (13, 21, 30, 37) and 10 postpartum.
  • Measured lung volumes, thoracic configuration, respiratory drive (P0.1), and pressures (Plmax, PEmax, Pdimax).

Related Experiment Videos

  • Assessed transdiaphragmatic pressure (Pdi) and end-expiratory gastric pressure (Pga) in a subset of participants.

    • Main Results:

    • Minute ventilation (VE) and VT/TI increased early and stabilized; mouth occlusion pressure (P0.1) progressively increased during pregnancy, indicating rising respiratory impedance.
    • P0.1 correlated with progesterone levels and significantly decreased postpartum.
    • End-expiratory gastric pressure (Pga) increased significantly during pregnancy, correlating with the fall in ERV.

    Conclusions:

    • Pregnancy involves increased ventilatory drive and respiratory impedance, stabilizing VE.
    • Respiratory muscle function remains intact despite altered thoracic configuration.
    • The rise in P0.1 may be linked to increased impedance or progesterone, requiring further differentiation.