NURS 3012 Lecture Notes - Lecture 3: Pulmonary Circulation, Ventricular Hypertrophy, Superior Vena Cava
23 May 2017
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Document Summary
Complex defects allowing unsaturated blood in systemic circulation. ** in fetal circulation, oxygenated blood enters the inferior vena cava from the placenta. It then goes to the right atrium, is shunted to the left atrium through the foramen ovale, moves to the left ventricle and is pushed through the aorta to upper extremities. It then enters the right atrium through the superior vena cava, goes to the right ventricle, and is shunted through the ductus arteriosus to the descending aorta. In fetal circulation, pulmonary resistance is greater than systemic resistance. This allows the two right -> left shunts to function. ** circulation at birth is different, as lungs expand and increased o2 saturations cause pulmonary vasodilation. Pulmonary pressures fall, and systemic pressures rise to more than pulmonary, causing the foramen ovale to close and beginning the closure of the ductus arteriosus. 6: post-op complications include heart block, heart failure, mitral regurgitation, dysrhythmias, and pulmonary hypertension.
