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
Which of the following does not complicate into CHF – 
Select and explain. 
A. Co–relation of aorta, B. Transposition of great vessels, C. Tetralogy of fallot's, D. Patent ductus arteriorus
C: Tetralogy of fallot's
Answer: C: Tetralogy of fallot's 
Explanation: The ventricular septal defect of TOF is always large enough to allow free exit to the right to left shunt.
Since the right ventricle is effectively decompressed by VSD, Congestive cardiac failure never occurs in TOE
Exceptions to this rule are : -


Anemia                                                                                                     
Infective endocarditis

iii) Systemic hypertension
iv) Myocarditis complicating TOF
V) Aortic or pulmonic regurgitation.

Remember:
Following do not occur in TOF -->       o Cardiomegaly          o CHF              o Recurrent chest infections