This Module is Module 5b in a 13 module eCourse series on Stats, Cardiac Cycle, Basic Echo Exam. For information on the full Pediatric Echocardiography, please click here. These congenital shunt lesions are somewhat less common, but represent an important set of lesions. We will discuss patent ductus arteriosus, aorto-pulmonary window, atrioventricular canal defects and total anomalous pulmonary venous return.