Which of the following is NOT right regarding respiratory function during late trimester of normal pregnancy?
The respiratory rate is essentially unchanged, but tidal volume and resting minute ventilation increase significantly as pregnancy advances. The functional residual capacity and the residual volume are decreased as a consequence of the elevated diaphragm. Lung compliance is unaffected by pregnancy, but airway conductance is increased and total pulmonary resistance reduced, possibly as a result of progesterone. Ref: Cunningham F.G., Leveno K.J., Bloom S.L., Hauth J.C., Rouse D.J., Spong C.Y. (2010). Chapter 5. Maternal Physiology. In F.G. Cunningham, K.J. Leveno, S.L. Bloom, J.C. Hauth, D.J. Rouse, C.Y. Spong (Eds), Williams Obstetrics, 23e.
Tidal volume and resting minute ventilation increase during late trimester
Functional residual capacity and the residual volume are decreased
Lung compliance is decreased
Total pulmonary resistance reduced