RT Book, Section A1 Deutsch, Nina A2 Freeman, Brian S. A2 Berger, Jeffrey S. SR Print(0) ID 1135742340 T1 Acyanotic Congenital Heart Disease T2 Anesthesiology Core Review: Part Two Advanced Exam YR 2016 FD 2016 PB McGraw-Hill Education PP New York, NY SN 9781259641770 LK accessanesthesiology.mhmedical.com/content.aspx?aid=1135742340 RD 2024/04/19 AB Congenital heart disease (CHD) consists of both shunting and/or obstructive lesions. In the presence of these defects, blood flow follows the path of least resistance. The amount of shunting between two circulatory beds is dependent on the relative gradient between these two systems as well as the size of the shunt. When there is an unrestrictive shunt, the amount and direction of blood flow are dependent solely on the difference in vascular resistances between the two sides. Any restriction (e.g., stenosis) typically serves as the point of maximal resistance, which limits the relative blood flow between two areas.