TY - CHAP M1 - Book, Section TI - Pulmonary Disorders A1 - Cunningham, F. Gary A1 - Leveno, Kenneth J. A1 - Dashe, Jodi S. A1 - Hoffman, Barbara L. A1 - Spong, Catherine Y. A1 - Casey, Brian M. PY - 2022 T2 - Williams Obstetrics, 26e 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: SN - PB - McGraw Hill CY - New York, NY Y2 - 2024/03/29 UR - obgyn.mhmedical.com/content.aspx?aid=1190768279 ER -