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Therefore, a large left-to-right shunt through a patent ductus arteriosus (PDA) results in left atrial and left ventricular enlargement. The pulmonary veins and the ascending aorta can also be dilated with a sufficiently large patent ductus arteriosus (PDA).
Types of CSF Shunt Valves. There are two types of CSF shunt valves: fixed and adjustable. Fixed shunt valves allow CSF fluid to drain when CSF pressure exceeds a certain âfixedâ threshold. Adjustable shunt valves allow for changes to the amount of fluid that flows through the valve.