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Ventilatory functions in pregnancy.

R Mokkapatti1, E C Prasad, Venkatraman

  • 1A.P. Chest Hospital, Irramnuma, Hyderabad.

Indian Journal of Physiology and Pharmacology
|October 1, 1991
PubMed
Summary
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Pregnant individuals show reduced lung function across all trimesters. Peak expiratory flow rate, forced vital capacity, and forced expiratory volume in one second decrease, particularly in the third trimester, with mid-expiratory flow lower in the first.

Area of Science:

  • Pulmonology
  • Obstetrics
  • Physiology

Background:

  • Pregnancy significantly alters maternal physiology.
  • Pulmonary function changes during pregnancy are not fully understood.
  • Assessing spirometric performance in pregnant individuals is crucial for clinical management.

Purpose of the Study:

  • To evaluate changes in spirometric parameters during pregnancy.
  • To compare lung function in pregnant individuals across trimesters with non-pregnant controls.
  • To determine the clinical significance of observed pulmonary function changes.

Main Methods:

  • Utilized a dry bellows spirometer and Wright's peak flow meter for measurements.
  • Employed the student's t-test for statistical analysis of data.

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  • Compared spirometric data from pregnant individuals in all three trimesters against a control group.

    • Main Results:

    • Significant reductions observed in peak expiratory flow rate, forced vital capacity, and forced expiratory volume in one second in the third trimester compared to controls.
    • Mid-expiratory flow rates were significantly lower in the first trimester.
    • Spirometric performance was reduced in all trimesters, though values remained within physiological limits.

    Conclusions:

    • Pregnancy is associated with a measurable decline in lung function across all trimesters.
    • These pulmonary function changes, while physiological, may be clinically relevant in pregnant individuals with comorbidities or those undergoing surgery.
    • Further research is warranted to understand the long-term implications and clinical management strategies.