RT Book, Section A1 Cunningham, F. Gary A1 Leveno, Kenneth J. A1 Dashe, Jodi S. A1 Hoffman, Barbara L. A1 Spong, Catherine Y. A1 Casey, Brian M. SR Print(0) ID 1190768279 T1 Pulmonary Disorders T2 Williams Obstetrics, 26e YR 2022 FD 2022 PB McGraw Hill PP New York, NY SN 9781260462739 LK accessmedicine.mhmedical.com/content.aspx?aid=1190768279 RD 2024/04/23 AB During pregnancy, pulmonary disorders are frequently encountered. In one study, asthma and community-acquired pneumonia accounted for almost 10 percent of nonobstetrical antepartum hospitalizations (Gazmararian, 2002). Pregnant women, especially those in the last trimester, tolerate lung disease poorly because of important pregnancy-induced changes in ventilatory physiology (Han, 2018). Lung volumes and capacities are significantly altered. In turn, these shift gas concentrations and acid-base values in blood. These important and sometimes marked changes are reviewed in Chapter 4 (p. 66), and normal values for blood gas can be found in the Appendix (p. 1232). Some of these can be summarized as follows: