TY - CHAP M1 - Book, Section TI - Supine Hypotensive Syndrome of Pregnancy A1 - Sherman, Caitlin A1 - Gauthier, Mandeep A1 - David, Marianne A2 - Freeman, Brian S. A2 - Berger, Jeffrey S. PY - 2016 T2 - Anesthesiology Core Review: Part Two Advanced Exam AB - Although cardiac output increases by 30%–40%, blood pressure is normally lower during pregnancy due to a 15% decrease in systemic vascular resistance. Furthermore, in the supine position, venous return decreases and cardiac output can be significantly affected with a drop of 25%–30% in the latter half of pregnancy (>20 weeks) when aortocaval compression is at its greatest. This compression of the aorta and the inferior vena cava against the lumbar vertebral bodies results in decreased venous return from the lower extremities, thereby decreasing preload, stroke volume and cardiac output. SN - PB - McGraw-Hill Education CY - New York, NY Y2 - 2024/03/29 UR - accessanesthesiology.mhmedical.com/content.aspx?aid=1135743203 ER -