This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pediatrics
Large PDA leads to ? 
Select and explain. 
A. Endocardial valvulitis, B. Eisenmenger syndrome, C. CHF, D. All of above
D: All of above
Answer: D: All of above 
Explanation: Ans. is 'd' i.e., All of above Patent ductus aeriosus (PDA) Small PDA may not cause any complication but large defect if untread may leads to : Pulmonary hypeension Left to Right shunt leads to too much circulation of blood in lung which leads to pulmonary hypeension. Eisenmenger's syndrome - Large standing pulmonary hypeension leads to permanent lung damage and causes Right to Left shunt. Endocarditis. Arrhythmia Enlargement of hea due to PDA increase risk of arrhythmias