TY - CHAP M1 - Book, Section TI - Pulmonary Hypertension A1 - Greenwood, John C. A1 - Winters, Michael A2 - Tintinalli, Judith E. A2 - Ma, O. John A2 - Yealy, Donald M. A2 - Meckler, Garth D. A2 - Stapczynski, J. Stephan A2 - Cline, David M. A2 - Thomas, Stephen H. PY - 2020 T2 - Tintinalli's Emergency Medicine: A Comprehensive Study Guide, 9e AB - The pulmonary vascular system is normally a high-flow, low-resistance circuit, with a mean pulmonary arterial pressure that constitutes approximately 15% to 20% of the systemic circulation.1 Normal pulmonary arterial systolic pressures range from 15 to 30 mm Hg, and diastolic pulmonary arterial pressures range from 4 to 12 mm Hg.1 Pulmonary hypertension exists when a mean pulmonary arterial pressure is >25 mm Hg at rest or >30 mm Hg during exertion.1,2 SN - PB - McGraw-Hill Education CY - New York, NY Y2 - 2024/03/28 UR - accessmedicine.mhmedical.com/content.aspx?aid=1166532245 ER -